EP2867657A1 - Techniques, systèmes et programmes lisibles par machine pour examen par résonance magnétique - Google Patents

Techniques, systèmes et programmes lisibles par machine pour examen par résonance magnétique

Info

Publication number
EP2867657A1
EP2867657A1 EP20130813129 EP13813129A EP2867657A1 EP 2867657 A1 EP2867657 A1 EP 2867657A1 EP 20130813129 EP20130813129 EP 20130813129 EP 13813129 A EP13813129 A EP 13813129A EP 2867657 A1 EP2867657 A1 EP 2867657A1
Authority
EP
European Patent Office
Prior art keywords
coil
nuclei
sample
subject
magnetization
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20130813129
Other languages
German (de)
English (en)
Other versions
EP2867657A4 (fr
Inventor
Neal Kalechofsky
Mirko HROVAT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Millikelvin Technologies LLC
Original Assignee
Millikelvin Technologies LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US13/844,446 external-priority patent/US9207298B2/en
Application filed by Millikelvin Technologies LLC filed Critical Millikelvin Technologies LLC
Publication of EP2867657A1 publication Critical patent/EP2867657A1/fr
Publication of EP2867657A4 publication Critical patent/EP2867657A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/46—NMR spectroscopy
    • G01R33/4608—RF excitation sequences for enhanced detection, e.g. NOE, polarisation transfer, selection of a coherence transfer pathway
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
    • G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
    • G01R33/3621—NMR receivers or demodulators, e.g. preamplifiers, means for frequency modulation of the MR signal using a digital down converter, means for analog to digital conversion [ADC] or for filtering or processing of the MR signal such as bandpass filtering, resampling, decimation or interpolation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/46—NMR spectroscopy
    • G01R33/4616—NMR spectroscopy using specific RF pulses or specific modulation schemes, e.g. stochastic excitation, adiabatic RF pulses, composite pulses, binomial pulses, Shinnar-le-Roux pulses, spectrally selective pulses not being used for spatial selection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/48—NMR imaging systems
    • G01R33/4828—Resolving the MR signals of different chemical species, e.g. water-fat imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/48—NMR imaging systems
    • G01R33/483—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy
    • G01R33/485—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy based on chemical shift information [CSI] or spectroscopic imaging, e.g. to acquire the spatial distributions of metabolites
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/48—NMR imaging systems
    • G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
    • G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
    • G01R33/563—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution of moving material, e.g. flow contrast angiography
    • G01R33/56308—Characterization of motion or flow; Dynamic imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/48—NMR imaging systems
    • G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
    • G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
    • G01R33/563—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution of moving material, e.g. flow contrast angiography
    • G01R33/56366—Perfusion imaging

Definitions

  • the present disclosure relates to improved techniques, systems and machine readable programs for magnetic resonance imaging.
  • the disclosure provides a method of performing a magnetic resonance protocol.
  • the method includes providing a magnetic resonance device including (i) a main magnet for providing a background magnetic field along a first direction, (ii) at least one radio-frequency coil, and (iii) at least one gradient coil that can be controlled to define at least one region of interest.
  • the method further includes detecting rf pulses from the sample or subject or with the at least one radio-frequency coil.
  • the method further includes usage of a feedback enabled coil (FEC) and an additional Supplementary Spin Reservoir (SSR), described more fully below, as techniques for enabling feedback of nuclear magnetism to occur even under clinical MRI conditions where it normally would not.
  • FEC feedback enabled coil
  • SSR Supplementary Spin Reservoir
  • a method for performing quantitative analysis of the amount of a molecule in a sample or subject or subject includes providing a magnetic resonance device including (i) a main magnet for providing a background magnetic field along a first direction, (ii) at least one radio-frequency coil, and (iii) at least one gradient coil that can be controlled to define at least one region of interest, introducing into the MR device at least one SSR containing a plurality of molecules, adjusting the circuitry of the resonant coil in order to induce electromagnetic feedback between the nuclear magnetization of at least one set of nuclei within the SSR and the at least one nearby resonant coil to cause the system to achieve a desired relationship between TR and T2, introducing RF pulses into the SSR so that the magnetization of at least one set of nuclei within the SSR is rotated to greater than ninety degrees, analyzing the SR pulse that results from step e to determine the peaktime and width of the SR pulse, introducing a sample or subject
  • the disclosure also provides a method, including providing a magnetic resonance device including (i) a main magnet for providing a background magnetic field along a first direction, (ii) at least one radio-frequency coil, and (iii) at least one gradient coil that can be controlled to define a region of interest, introducing a sample or subject to be studied into the region of interest, introducing RF pulses into the sample or subject to energize nuclei in the sample or subject, inducing electromagnetic feedback between a first set of nuclei in the sample or subject and the at least one radio frequency coil to cause the vector direction of the nuclear magnetization of the first set of nuclei to rotate to a desired angle with respect to the first direction of the background magnetic field while substantially preventing electromagnetic feedback from being induced between a second set of nuclei in the sample or subject and the at least one resonant coil, activating a gradient magnetic field in the region of interest in order to destroy the magnetization associated with the first set of nuclei, deactivating gradient, employing RF pulses to rotate second set of nuclear
  • the method can further include processing information obtained from a plurality of pulses of transverse magnetization to produce at least one of (i) an image, (ii) dynamic flow data, (iii) perfusion data, (iii) spectroscopic identity of chemical species, (iv) physiological data, or (v) metabolic data.
  • the method can further include inducing electromagnetic feedback to cause the vector direction of the nuclear magnetization of the second set of nuclei to rotate to a desired angle with respect to the first direction of the background magnetic field, and stopping the electromagnetic feedback to permit the second set of nuclei to permit the pulse of transverse magnetization to propagate.
  • Electromagnetic feedback can be induced at least in part by substantially eliminating the presence of a gradient magnetic field in the at least one region of interest.
  • Electromagnetic feedback can be induced at least in part by selectively tuning the at least one radio frequency coil to a predetermined resonant frequency.
  • the sample or subject to be studied can be an in -vivo sample or subject including fat and water, and further wherein a pulse of transverse magnetization can be detected with the at least one radio-frequency coil from protons in water, and further wherein substantially no transverse magnetization may be detected with the at least one radio-frequency coil from protons in fat.
  • the disclosure further provides a method for performing magnetic resonance spectroscopic imaging, including providing a magnetic resonance device including (i) a main magnet for providing a background magnetic field along a first direction, (ii) at least one resonant feedback enabled coil, and (iii) at least one gradient coil that can be controlled to define at least one region of interest, introducing a sample or subject to be studied into the region of interest, carrying out MR pulse sequence protocols to produce at least one of (i) an image, (ii) dynamic flow data, (iii) perfusion data, (iii) spectroscopic identity of chemical species, (iv) physiological data, or (v) metabolic data, and adjusting the circuitry of the RF coil in order to induce
  • the method can further include processing information obtained from a plurality of pulses of transverse magnetization to produce at least one of (i) an image, (ii) dynamic flow data, (iii) perfusion data, (iii) spectroscopic identity of chemical species, (iv) physiological data, or (v) metabolic data.
  • the electromagnetic feedback can be induced at least in part by
  • electromagnetic feedback can be induced at least in part by selectively tuning the resonant coil to a predetermined resonant frequency.
  • the magnetization vector of the at least one set of nuclei can be directed substantially entirely anti-parallel to the first direction of the background magnetic field.
  • the background magnetic field can be, for example, about 1.0 Tesla, about 1.5 Tesla, about 2.0 Tesla, about 2.5 Tesla, about 3.0 Tesla, about 4.0 Tesla, about 5.0 Tesla, about 6.0 Tesla, about 7.0 Tesla, about 8.0 Tesla, about 9.0 Tesla, about 10.0 Tesla or greater or less, in any desired increment of 0.1 Tesla.
  • the vector direction of the nuclear magnetization of the at least one set of nuclei can be permitted to fully align with the first direction of the background magnetic field when the pulse is generated.
  • the vector direction of the nuclear magnetization of the at least one set of nuclei can be permitted to partially align with the first direction of the background magnetic field when the pulse is generated.
  • the method can further include generating a plurality of pulses of transverse magnetization from the at least one set of nuclei by permitting the vector direction of the nuclear magnetization of the at least one set of nuclei to progressively and discretely approach full alignment with the first direction of the background magnetic field with each succeeding pulse of transverse magnetization.
  • the inducing step can include inducing electromagnetic feedback between the nuclear magnetization of a plurality of sets of nuclei in at least two discrete, separated physical locations within the object and at least one nearby resonant coil to cause the vector direction of the nuclear magnetizations of each set of nuclei to rotate to a desired angle with respect to the first direction of the background magnetic field to generate the at least one electromagnetic pulse of transverse magnetization.
  • At least one of the at least one radio frequency coil and the at least one gradient coil is a local coil.
  • at least one of the at least one radio frequency coil and the at least one gradient coil can be integrated into the magnetic resonance system.
  • the at least one radio frequency coil can be a whole body coil, and can be used at background fields in excess of 3.0 Tesla.
  • the at least one radio frequency coil can be a whole body phased array transmit/receive coil system having a plurality of coils that can selectively transmit and receive rf pulses of transverse magnetization.
  • a coil designed to amplify feedback can be employed.
  • the coil can additionally and optionally be made to permit manipulation of the phase of the feedback field.
  • This coil is referred to in this document as a Feedback Enabled Coil (FEC).
  • FEC Feedback Enabled Coil
  • system can further include means for processing information obtained from a plurality of pulses of transverse magnetization to produce at least one of (i) an image, (ii) dynamic flow data, (iii) perfusion data, (iii) spectroscopic identity of chemical species, (iv) physiological data, and (v) metabolic data.
  • electromagnetic feedback can be induced at least in part by
  • the region of interest can include at least one voxel, and the at least one gradient coil is adapted and configured to apply a magnetic field gradient in at least one of three mutually orthogonal directions.
  • Electromagnetic feedback can be induced at least in part by selectively tuning the at least one rf coil to a predetermined resonant frequency.
  • the system can selectively and controllably apply a RF pulse to the sample or subject in order to at least partially invert the nuclear magnetization of the at least one set of nuclei prior to the inducing step.
  • the system can be adapted to direct the magnetization vector of the at least one set of nuclei substantially entirely anti-parallel to the first direction of the background magnetic field.
  • the background magnetic field can be, for example, about l.o Tesla, about 1.5 Tesla, about 2.0 Tesla, about 2.5 Tesla, about 3.0 Tesla, about 4.0 Tesla, about 5.0 Tesla, about 6.0 Tesla, about 7.0 Tesla, about 8.0 Tesla, about 9.0 Tesla, about 10.0 Tesla or greater or less, in any desired increment of 0.1 Tesla.
  • the system can be adapted to permit the vector direction of the nuclear magnetization of the at least one set of nuclei to fully align with the first direction of the background magnetic field when the pulse is generated.
  • the system can be adapted to permit the vector direction of the nuclear magnetization of the at least one set of nuclei to partially align with the first direction of the background magnetic field when the pulse is generated. If desired, the system can be further adapted to selectively and
  • the program can include instructions to facilitate definition of a region of interest, instructions for inducing electromagnetic feedback between the nuclear magnetization of at least one set of nuclei within the sample or subject and at least one nearby resonant coil to cause the vector direction of the nuclear magnetization of the at least one set of nuclei to rotate to a desired angle with respect to the first direction of the background magnetic field to generate at least one electromagnetic pulse of transverse magnetization ⁇ , and instructions to facilitate processing signals received arising from the pulse of transverse magnetization with the at least one radio-frequency coil.
  • the program can include instructions to induce electromagnetic feedback at least in part by selectively tuning the at least one rf coil to a predetermined resonant frequency.
  • the program can similarly include instructions to cause the system to selectively and controllably apply a RF pulse to the sample or subject in order to at least partially invert the nuclear magnetization of the at least one set of nuclei prior to inducing the electromagnetic feedback.
  • the computer program can include instructions to cause the magnetic resonance system to direct the magnetization vector of the at least one set of nuclei substantially entirely anti-parallel to the first direction of the background magnetic field.
  • the computer program can include instructions to cause the magnetic resonance system to permit the vector direction of the nuclear magnetization of the at least one set of nuclei to fully align with the first direction of the background magnetic field when the pulse is generated.
  • the computer program can include instructions to cause the magnetic resonance system to permit the vector direction of the nuclear magnetization of the at least one set of nuclei to partially align with the first direction of the background magnetic field when the pulse is generated.
  • the computer program can similarly include instructions to cause the magnetic resonance system to induce electromagnetic feedback between the nuclear magnetization of a plurality of sets of nuclei in at least two discrete, separated physical locations within the object and at least one nearby resonant coil to cause the vector direction of the nuclear magnetizations of each set of nuclei to rotate to a desired angle with respect to the first direction of the background magnetic field to generate the at least one electromagnetic pulse of transverse magnetization.
  • the computer program can include instructions to cause the magnetic resonance system to operate at least one radio frequency coil and at least one gradient coil that is a local coil.
  • the computer program can include instructions to cause the magnetic resonance system to operate at least one radio frequency coil and at least one gradient coil that is integrated into the magnetic resonance system.
  • the computer program can include instructions to operate a radio frequency coil that is a whole body phased array transmit/receive coil system having a plurality of coils that can selectively transmit and receive rf pulses of transverse magnetization.
  • the computer program can include instructions to operate a radio frequency coil that is a local phased array transmit/receive coil system having a plurality of coils that can selectively transmit and receive rf pulses of transverse magnetization.
  • the computer program can similarly include instructions to operate at least one radio frequency coil that further includes a plurality of local gradient coils for locally controlling the gradient magnetic field.
  • Figure l illustrates a simulated SR pulse resulting from inverting the magnetization of a single ensemble of nuclei in accordance with the disclosure.
  • Figure 2 depicts an exemplary magnetic resonance system in accordance with the disclosure.
  • Figure 3 depicts aspects of an exemplary computer system in accordance with the disclosure for operating a magnetic resonance system.
  • Figure 4 illustrates changes to the SR pulse parameter in the region of the SR to normal transition, wherein Figure 4A illustrates change in width of the pulse ⁇ as the SR transition is approach ( ⁇ 2 ⁇ ) for an initial x-y magnetization of 0.01, and further wherein Figure 4B illustrates change in peaktime t 0 of the pulse as the SR transition is approach ( ⁇ 2 ⁇ l) for an initial x-y magnetization of 0.001.
  • Figure 5 depicts a signal vs. time chart for a coaxial tube containing water (outside) and acetone (inside).
  • Figure 6 is an illustrative field map showing where the local gradient is very strong except in one region of space.
  • Figure 7 shows examples of an image made using SR pulses.
  • Figure 8 is an example of a feedback system known in the art.
  • Figure 9 is an example of a feedback system for a FEC coil provided in accordance with the disclosure.
  • Figure 11 depicts a subject inside a Feedback Enabled Coil (FEC) with an Supplementary Spin reservoir (SSR) located nearby and inside the Field of View (FOV) of the same FEC.
  • FEC Feedback Enabled Coil
  • SSR Supplementary Spin reservoir
  • M is the nuclear magnetization
  • B are the magnetic fields
  • R is the relaxation matrix
  • Ti is the constant of exponential relaxation of the longitudinal (z) magnetization and T 2 is the exponential constant of relaxation of the transverse magnetization.
  • m z (f ) ⁇ M o [(T r I ⁇ ) tanh((i - ⁇ 0 ) ⁇ )- ⁇ ⁇ ⁇ 2
  • phase of the transverse magnetization is given by
  • the frequency of the magnetization is given by the derivative.
  • the frequency can change if the phase is not set correctly.
  • m z (t) ⁇ M o [(T r I T) tanh ((i - t o ) I ⁇ ) - t R I T 2 ]
  • the nuclear magnetism from one or more molecules in a sample or subject contained in one or more resonant coils can be made to feedback upon itself. Under such conditions we describe these molecule(s) as being in the "superradiant (SR) condition".
  • the SR condition is defined as being where TR ⁇ T2. Clinical MR machines cannot normally produce the conditions necessary to produce TR
  • This disclosure teaches, in addition to other teachings, methods and systems for achieving the SR state even for low concentrations of molecules in otherwise clinical conditions.
  • teachings include: use of a feedback enabled coil (FEC) so that the active Q of one or more resonant coils of the MR machine can be made very high.
  • FEC feedback enabled coil
  • SSR Supplementary Spin Reservoir
  • Applicant has discovered methods of producing SR conditions in a localized volume in space. In a preferred embodiment, this is done by turning off/on, increasing/decreasing or changing in sign a local magnetic field gradient or gradients. Other embodiments for this include manipulating the probe Q (e.g., by detuning the coil selectively), frequency, and/or changing the parameters of the ambient magnetic field.
  • an SR pulse can be produced that originates from a predefined spatial location. It can therefore be assigned a definite spatial value which is essential to creating a resolved image.
  • SR conditions have been suppressed by using a gradient or gradients that are temporally structures—that is, that turn on/off in time. This suppresses or permits SR conditions in the entire volume located within the field of the resonant coil.
  • gradients can be spatially structured to allow SR conditions to exist in one part of a volume and suppressed in others. By careful manipulation of the nearby current coils the gradient can be made to be zero or very low— sufficiently low to permit SR conditions—in one voxel or other region of interest (e.g., comprising multiple voxels) while remaining large enough to deter SR conditions in the remaining fraction of the volume.
  • the region of zero gradient can then be moved to produce signal from other voxels so as to produce sufficient information to construct an image. This can be done sequentially or in parallel to speed image production.
  • an SR pulse can propagate. This causes any local Mz to rotate into the transverse plane and produce Mxy. Mxy is precessing at the Larmor frequency and hence can be detected by the MR pick up coils. Local conditions can be adjusted— as a non exclusive example, by turning on/off a local gradient— so as to nutate only part of the local Mz into the xy plane. In this manner additional Mz is available to produce pulses at a later time should that be desirable. Or all of the local Mz can be used up in a single pulse. The spatial identity of the pulse can be determined in a number of manners.
  • this can be done by associating the zero point of the local gradient with a definite point or points in x,y,z.
  • the gradient field can be set to about zero for individual voxels spaced from one another in order to speed data acquisition by engaging in parallel data collection.
  • Local voxel or voxels of zero or very low gradient field can be produced and moved about in space by adjusting currents in nearby shim coils that are typically part of any MR imaging system. Thus an entire image can be built by manipulating the shim coils. Multiple voxels can be produced contemporaneously for example by causing the shim coils to have a time dependent current I 0 cos(wt) rather than a static current I 0 . By adjusting the current frequency in various shims multiple local voxels of zero or low gradient can be produced either permanently or temporarily as desired.
  • a local coil can be provided surrounding or adjacent to a particular body part (e.g., a head/shoulder coil for neurovascular imaging, a back coil, knee coil, breast coil, etc.) that includes the capability to receive ⁇ pulses and that can optionally apply rf pulses and/or gradient fields to provide a further means for control of the local gradient field in the region of interest.
  • a particular body part e.g., a head/shoulder coil for neurovascular imaging, a back coil, knee coil, breast coil, etc.
  • Mxy is only produced in a region of low or zero gradient
  • motion artifacts that plague traditional MR imaging can be reduced.
  • Motion artifacts are produced when spins move in the high gradient fields used to produce images in traditional MR. As the spins move in the gradient they lose phase information which leads to image blurring. Producing pulses only in the region of low or zero gradient can be expected to suppress this phenomenon.
  • SR pulses from are inherently phase randomized so there cannot be build up of phase errors as the image is produced voxel by voxel.
  • phase of any Mx converted under SR conditions from local Mz to Mxy can be distinguished from the phase of spins outside the local voxel. This allows the use of phase locked loops or similar methods to amplify the Mxy signal arising from spins in the local voxel of interest.
  • T 2 mapping can provide contrast between different types of tissue in particular between spins in solid dense matter such as bone and that in surrounding tissue.
  • T 2 contrast can be provided using the proposed technique. As a non exclusive example, this can be done by adjusting the Q of the resonant coil used to nutate any Mz into Mxy. Assuming a low or zero gradient, by increasing Q, the time for an SR pulse to propagate can be made faster than local T 2 . Conversely, lowering Q can cause T 2 to be faster than the time required to produce an RD or SR pulse. In this circumstance no pulse can propagate. Thus regions of different T 2 s can be distinguished by controlling the local field gradient and adjusting the Q of the pick up coil.
  • slice selective frequency encoding can be used to derive 2D information, with the above technique providing third dimensional information.
  • An exemplary magnetic resonance system is depicted in Figure 2, and includes a plurality of primary magnetic coils 10 that generate a uniform, temporally constant magnetic field B 0 along a longitudinal or z-axis of a central bore 12 of the device.
  • the primary magnet coils are supported by a former 14 and received in a toroidal helium vessel or can 16. The vessel is filled with helium to maintain the primary magnet coils at superconducting
  • the can is surrounded by a series of cold shields 18 which are supported in a vacuum Dewar 20.
  • a series of cold shields 18 which are supported in a vacuum Dewar 20.
  • annular resistive magnets, C-magnets, and the like are also contemplated.
  • a whole body gradient coil assembly 30 includes x, y, and z-coils mounted along the bore 12 for generating gradient magnetic fields, Gx, Gy, and Gz.
  • the gradient coil assembly is a self-shielded gradient coil that includes primary x, y, and z-coil assemblies 32 potted in a dielectric former and secondary x, y, and z-coil assemblies 34 that are supported on a bore defining cylinder of the vacuum Dewar 20.
  • a whole body radio frequency coil 36 can be mounted inside the gradient coil assembly 30.
  • a whole body radio frequency shield 38 e.g., copper mesh, can be mounted between the whole body RF coil 36 and the gradient coil assembly 30.
  • an insertable radio frequency coil 40 can be removably mounted in the bore in an examination region defined around an isocenter of the magnet 10.
  • the insertable radio frequency coil is a head and neck coil for imaging one or both of patient's head and neck, but other extremity coils can be provided, such as back coils for imaging the spine, knee coils, shoulder coils, breast coils, wrist coils and the like.
  • an operator interface and control station includes a human-readable display, such as a video monitor 52, and operator input devices such as a keyboard 54, a mouse 56, a trackball, light pen, or the like.
  • a computer control and reconstruction module 58 is also provided that includes hardware and software for enabling the operator to select among a plurality of preprogrammed magnetic resonance sequences that are stored in a sequence control memory, if rf pulses are to be used as a part of the imaging study.
  • a sequence controller 60 controls gradient amplifiers 62 connected with the gradient coil assembly 30 for causing the generation of the Gx, Gy, and Gz gradient magnetic fields at appropriate times during the selected gradient sequence and a digital transmitter 64 which causes a selected one of the whole body and insertable radio frequency coils to generate Bi radio frequency field pulses at times appropriate to the selected sequence, if rf pulses are to be used in the study.
  • MR signals received by the coil 40 are demodulated by a digital receiver 66 and stored in a data memory 68.
  • the data from the data memory are reconstructed by a reconstruction or array processor 70 into a volumetric image representation that is stored in an image memory 72. If a phased array is used as the receiving coil assembly, the image can be reconstructed from the coil signals.
  • a video processor 74 under operator control converts selected portions of the volumetric image representation into slice images, projection images, perspective views, or the like as is conventional in the art for display on the video monitor.
  • FIG 3 illustrates inventive aspects of a MKTTM controller 601 for controlling a system such as that illustrated in Figure 2 implementing some of the embodiments disclosed herein.
  • the MKTTM controller 601 may serve to aggregate, process, store, search, serve, identify, instruct, generate, match, and/or facilitate interactions with a computer through various technologies, and/or other related data.
  • a user or users may engage information technology systems (e.g., computers) to facilitate operation of the system and information processing.
  • computers employ processors to process information; such processors 603 may be referred to as central processing units (CPU).
  • processors 603 may be referred to as central processing units (CPU).
  • CPUs One form of processor is referred to as a microprocessor.
  • CPUs use communicative circuits to pass binary encoded signals acting as instructions to enable various operations. These instructions may be operational and/or data instructions containing and/or referencing other instructions and data in various processor accessible and operable areas of memory 629 (e.g., registers, cache memory, random access memory, etc.).
  • Such communicative instructions may be stored and/or transmitted in batches (e.g., batches of instructions) as programs and/or data components to facilitate desired operations.
  • These stored instruction codes e.g., programs, may engage the CPU circuit components and other motherboard and/or system components to perform desired operations.
  • One type of program is a computer operating system, which, may be executed by CPU on a computer; the operating system enables and facilitates users to access and operate computer information technology and resources.
  • Some resources that may be employed in information technology systems include: input and output mechanisms through which data may pass into and out of a computer; memory storage into which data may be saved; and processors by which information may be processed. These information technology systems may be used to collect data for later retrieval, analysis, and manipulation, which may be facilitated through a database program. These information technology systems provide interfaces that allow users to access and operate various system components.
  • the MKTTM controller 601 may be connected to and/or communicate with entities such as, but not limited to: one or more users from user input devices 611; peripheral devices 612, components of the magnetic resonance system; an optional cryptographic processor device 628; and/or a communications network 613.
  • the MKTTM controller 601 may be connected to and/or communicate with users, e.g., 633a, operating client device(s), e.g., 633b, including, but not limited to, personal computer(s), server(s) and/or various mobile device(s) including, but not limited to, cellular telephone(s), smartphone(s) (e.g., iPhone®, Blackberry®, Android OS-based phones etc.), tablet computer(s) (e.g., Apple iPadTM, HP SlateTM, Motorola XoomTM, etc.), eBook reader(s) (e.g., Amazon KindleTM, Barnes and Noble's NookTM eReader, etc.), laptop computer(s), notebook(s), netbook(s), gaming console(s) (e.g., XBOX LiveTM, Nintendo® DS, Sony PlayStation® Portable, etc.), portable scanner(s) and/or the like.
  • users e.g., 633a
  • operating client device(s) e.g., 633b
  • Networks are commonly thought to comprise the interconnection and interoperation of clients, servers, and intermediary nodes in a graph topology.
  • server refers generally to a computer, other device, program, or combination thereof that processes and responds to the requests of remote users across a communications network. Servers serve their information to requesting "clients.”
  • client refers generally to a computer, program, other device, user and/or combination thereof that is capable of processing and making requests and obtaining and processing any responses from servers across a communications network.
  • a computer, other device, program, or combination thereof that facilitates, processes information and requests, and/or furthers the passage of information from a source user to a destination user is commonly referred to as a "node.”
  • Networks are generally thought to facilitate the transfer of information from source points to destinations.
  • a node specifically tasked with furthering the passage of information from a source to a destination is commonly called a "router.”
  • There are many forms of networks such as Local Area Networks (LANs), Pico networks, Wide Area Networks (WANs), Wireless Networks (WLANs), etc.
  • LANs Local Area Networks
  • WANs Wide Area Networks
  • WLANs Wireless Networks
  • the Internet is generally accepted as being an interconnection of a multitude of networks whereby remote clients and servers may access and interoperate with one another.
  • the MKTTM controller 601 may be based on computer systems that may comprise, but are not limited to, components such as: a computer systemization 602 connected to memory 629.
  • Computer Systemization may comprise, but are not limited to, components such as: a computer systemization 602 connected to memory 629.
  • a computer systemization 602 may comprise a clock 630, central processing unit (“CPU(s)” and/or “processor(s)” (these terms are used interchangeable throughout the disclosure unless noted to the contrary)) 603, a memory 629 (e.g., a read only memory (ROM) 606, a random access memory (RAM) 605, etc.), and/or an interface bus 607, and most frequently, although not necessarily, are all interconnected and/or communicating through a system bus 604 on one or more (mother)board(s) 602 having conductive and/or otherwise transportive circuit pathways through which instructions (e.g., binary encoded signals) may travel to effect communications, operations, storage, etc.
  • the computer systemization may be connected to an internal power source 686; e.g., optionally the power source may be internal.
  • a cryptographic processor 626 and/or transceivers (e.g., ICs) 674 may be connected to the system bus.
  • transceivers may be connected as either internal and/or external peripheral devices 612 via the interface bus I/O.
  • the transceivers may be connected to antenna(s) 675, thereby effectuating wireless transmission and reception of various communication and/or sensor protocols; for example the antenna(s) may connect to: a Texas Instruments Inc.
  • Instruments WiLink WL1283 transceiver chip e.g., providing 802.1m, Bluetooth 3.0, FM, global positioning system (GPS) (thereby allowing MKTTM controller to determine its location)
  • Broadcom BCM4329FKUBG transceiver chip e.g., providing 802.1m, Bluetooth 2.1 + EDR, FM, etc.
  • a Broadcom BCM4750IUB8 receiver chip e.g., GPS
  • an Infineon Technologies X-Gold 618-PMB9800 e.g., providing 2G/3G HSDPA/HSUPA communications
  • the system clock typically has a crystal oscillator and generates a base signal through the computer systemization's circuit pathways.
  • the clock is typically coupled to the system bus and various clock multipliers that will increase or decrease the base operating frequency for other components interconnected in the computer systemization.
  • the clock and various components in a computer systemization drive signals embodying information throughout the system.
  • Such transmission and reception of instructions embodying information throughout a computer systemization may be commonly referred to as communications.
  • These communicative instructions may further be transmitted, received, and the cause of return and/or reply communications beyond the instant computer systemization to: communications networks, input devices, other computer systemizations, peripheral devices, and/or the like.
  • any of the above components may be connected directly to one another, connected to the CPU, and/or organized in numerous variations employed as exemplified by various computer systems.
  • the CPU comprises at least one high-speed data processor adequate to execute program components for executing user and/or system-generated requests.
  • the processors themselves will incorporate various specialized processing units, such as, but not limited to: integrated system (bus) controllers, memory management control units, floating point units, and even specialized processing sub-units like graphics processing units, digital signal processing units, and/or the like.
  • processors may include internal fast access addressable memory, and be capable of mapping and addressing memory 629 beyond the processor itself; internal memory may include, but is not limited to: fast registers, various levels of cache memory (e.g., level 1, 2, 3, etc.), RAM, etc.
  • the processor may access this memory through the use of a memory address space that is accessible via instruction address, which the processor can construct and decode allowing it to access a circuit path to a specific memory address space having a memory state.
  • the CPU may be a microprocessor such as:
  • the CPU interacts with memory through instruction passing through conductive and/or transportive conduits (e.g., (printed) electronic and/or optic circuits) to execute stored instructions (i.e., program code) according to conventional data processing techniques.
  • conductive and/or transportive conduits e.g., (printed) electronic and/or optic circuits
  • stored instructions i.e., program code
  • MKTTM controller communicates within the MKTTM controller and beyond through various interfaces.
  • distributed processors e.g., Distributed MKTTM embodiments
  • mainframe multi-core
  • parallel and/or super-computer architectures
  • PDAs Personal Digital Assistants
  • features of the MKTTM implementations may be achieved by implementing a microcontroller such as CAST'S R8051XC2 microcontroller; Intel's MCS 51 (i.e., 8051 microcontroller); and/or the like.
  • some feature implementations may rely on embedded components, such as: Application-Specific Integrated Circuit ("ASIC"), Digital Signal Processing (“DSP”), Field Programmable Gate Array (“FPGA”), and/or the like embedded technology.
  • ASIC Application-Specific Integrated Circuit
  • DSP Digital Signal Processing
  • FPGA Field Programmable Gate Array
  • any of the MKTTM component collection (distributed or otherwise) and/or features may be implemented via the microprocessor and/or via embedded components; e.g., via ASIC, coprocessor, DSP, FPGA, and/or the like.
  • some implementations of the MKTTM may be implemented with embedded components that are configured and used to achieve a variety of features or signal processing.
  • An FPGAs logic blocks can be programmed to perform the function of basic logic gates such as AND, and XOR, or more complex combinational functions such as decoders or simple mathematical functions. In most FPGAs, the logic blocks also include memory elements, which may be simple flip-flops or more complete blocks of memory.
  • the MKTTM may be developed on regular FPGAs and then migrated into a fixed version that more resembles ASIC implementations. Alternate or coordinating implementations may migrate MKTTM controller features to a final ASIC instead of or in addition to FPGAs. Depending on the implementation all of the aforementioned embedded components and microprocessors may be considered the "CPU" and/or "processor" for the MKTTM.
  • the power source 686 may be of any standard form for powering small electronic circuit board devices such as the following power cells: alkaline, lithium hydride, lithium ion, lithium polymer, nickel cadmium, solar cells, and/or the like. Other types of AC or DC power sources may be used as well. In the case of solar cells, in one embodiment, the case provides an aperture through which the solar cell may capture photonic energy.
  • the power cell 686 is connected to at least one of the interconnected subsequent components of the MKTTM thereby providing an electric current to all subsequent components.
  • the power source 686 is connected to the system bus component 604.
  • an outside power source 686 is provided through a connection across the I/O 608 interface. For example, a USB and/or IEEE 1394 connection carries both data and power across the connection and is therefore a suitable source of power.
  • Network interfaces 610 may accept, communicate, and/or connect to a communications network 613.
  • the MKTTM controller is accessible through remote clients 633b (e.g., computers with web browsers) by users 633a.
  • Network interfaces may employ connection protocols such as, but not limited to: direct connect, Ethernet (thick, thin, twisted pair 10/100/1000 Base T, and/or the like), Token Ring, wireless connection such as IEEE 8o2.na-x, and/or the like.
  • distributed network controllers e.g., Distributed MKTTM
  • a communications network may be any one and/or the combination of the following: a direct interconnection; the Internet; a Local Area Network (LAN); a Metropolitan Area Network (MAN); an Operating
  • One typical output device may include a video display, which typically comprises a Cathode Ray Tube (CRT) or Liquid Crystal Display (LCD) based monitor with an interface (e.g., DVI circuitry and cable) that accepts signals from a video interface, may be used.
  • the video interface composites information generated by a computer systemization and generates video signals based on the composited information in a video memory frame.
  • Another output device is a television set, which accepts signals from a video interface.
  • the video interface provides the composited video information through a video connection interface that accepts a video display interface (e.g., an RCA composite video connector accepting an RCA composite video cable; a DVI connector accepting a DVI display cable, etc.).
  • User input devices 611 often are a type of peripheral device 612 (see below) and may include: card readers, dongles, finger print readers, gloves, graphics tablets, joysticks, keyboards, microphones, mouse (mice), remote controls, retina readers, touch screens (e.g., capacitive, resistive, etc.), trackballs, trackpads, sensors (e.g.,
  • accelerometers ambient light, GPS, gyroscopes, proximity, etc.
  • styluses and/or the like.
  • Peripheral devices 612 such as other components of the MR system, including signal generators in communication with RF coils, receivers in
  • communication with RF coils, the gradient coil system, main magnet system and the like may be connected and/or communicate to I/O and/or other facilities of the like such as network interfaces, storage interfaces, directly to the interface bus, system bus, the CPU, and/or the like.
  • Peripheral devices may be external, internal and/or part of the MKTTM controller.
  • Peripheral devices may also include: antenna, audio devices (e.g., line-in, line-out, microphone input, speakers, etc.), cameras (e.g., still, video, webcam, etc.), dongles (e.g., for copy protection, ensuring secure transactions with a digital signature, and/or the like), external processors (for added capabilities; e.g., crypto devices 628), force-feedback devices (e.g., vibrating motors), network interfaces, printers, scanners, storage devices, transceivers (e.g., cellular, GPS, etc.), video devices (e.g., goggles for functional imaging, for example, monitors, etc.), video sources, visors, and/or the like. Peripheral devices often include types of input devices (e.g., cameras).
  • audio devices e.g., line-in, line-out, microphone input, speakers, etc.
  • cameras e.g., still, video, webcam, etc.
  • dongles e.
  • Cryptographic units such as, but not limited to, microcontrollers, processors 626, interfaces 627, and/or devices 628 may be attached, and/or
  • a MC68HC16 microcontroller manufactured by Motorola Inc., may be used for and/or within cryptographic units.
  • the MC68HC16 microcontroller utilizes a 16-bit multiply-and-accumulate instruction in the 16 MHz configuration and requires less than one second to perform a 512-bit RSA private key operation.
  • Cryptographic units support the authentication of communications from interacting agents, as well as allowing for anonymous transactions.
  • Cryptographic units may also be configured as part of CPU. Equivalent microcontrollers and/or processors may also be used.
  • the operating system component 615 is an executable program component facilitating the operation of the MKTTM controller. Typically, the operating system facilitates access of I/O, network interfaces, peripheral devices, storage devices, and/or the like.
  • the operating system may be a highly fault tolerant, scalable, and secure system such as: Apple Macintosh OS X (Server); AT&T Plan 9; Be OS; Unix and Unix-like system distributions (such as AT&T's UNIX; Berkley Software Distribution (BSD) variations such as FreeBSD, NetBSD, OpenBSD, and/or the like; Linux
  • an operating system may communicate to and/or with other components in a
  • An information server component 616 is a stored program component that is executed by a CPU.
  • the information server may be a conventional Internet
  • the information server may support secure communications protocols such as, but not limited to, File Transfer Protocol (FTP); HyperText Transfer Protocol (HTTP); Secure Hypertext Transfer Protocol (HTTPS), Secure Socket Layer (SSL), messaging protocols (e.g., America Online (AOL) Instant Messenger (AIM), Application Exchange (APEX), ICQ, Internet Relay Chat (IRC), Microsoft Network (MSN) Messenger Service, Presence and Instant Messaging Protocol (PRIM), Internet Engineering Task Force's (IETF's) Session Initiation Protocol (SIP), SIP for Instant Messaging and Presence Leveraging Extensions (SIMPLE), open XML-based Extensible Messaging and Presence Protocol (XMPP) (i.e., Jabber or Open Mobile Alliance's (OMA's) Instant Messaging and
  • FTP File Transfer Protocol
  • HTTP HyperText Transfer Protocol
  • HTTPS Secure Hypertext Transfer Protocol
  • SSL Secure Socket Layer
  • messaging protocols e.g., America Online (AOL) Instant Messenger (AIM), Application Exchange
  • http://123.124.125.126/myInformation.html might have the IP portion of the request "123.124.125.126" resolved by a DNS server to an information server at that IP address; that information server might in turn further parse the http request for the
  • “/mylnformation.html” portion of the request and resolve it to a location in memory containing the information "mylnformation.html.” Additionally, other information serving protocols may be employed across various ports, e.g., FTP communications across port 21, and/or the like.
  • An information server may communicate to and/or with other components in a component collection, including itself, and/or facilities of the like. Most frequently, the information server communicates with the MKTTM database 619, operating systems, other program components, user interfaces, Web browsers, and/or the like.
  • Access to the MKTTM database may be achieved through a number of database bridge mechanisms such as through scripting languages as enumerated below (e.g., CGI) and through inter- application communication channels as enumerated below (e.g., CORBA, WebObjects, etc.). Any data requests through a Web browser are parsed through the bridge mechanism into appropriate grammars as required by the MKTTM.
  • the information server would provide a Web form accessible by a Web browser. Entries made into supplied fields in the Web form are tagged as having been entered into the particular fields, and parsed as such. The entered terms are then passed along with the field tags, which act to instruct the parser to generate queries directed to appropriate tables and/or fields.
  • a user interface component 617 is a stored program component that is executed by a CPU.
  • the user interface may be a conventional graphic user interface as provided by, with, and/or atop operating systems and/or operating environments such as already discussed.
  • the user interface may allow for the display, execution, interaction, manipulation, and/or operation of program components and/or system facilities through textual and/or graphical facilities.
  • the user interface provides a facility through which users may affect, interact, and/or operate a computer system.
  • a user interface may communicate to and/or with other components in a component collection, including itself, and/or facilities of the like. Most frequently, the user interface communicates with operating systems, other program components, and/or the like.
  • the user interface may contain, communicate, generate, obtain, and/or provide program component, system, user, and/or data communications, requests, and/or responses.
  • a mail server component 621 is a stored program component that is executed by a CPU 603.
  • the mail server may be a conventional Internet mail server such as, but not limited to sendmail, Microsoft Exchange, and/or the like.
  • the mail server may allow for the execution of program components through facilities such as ASP, ActiveX, (ANSI) (Objective-) C (++), C# and/or .NET, CGI scripts, Java, JavaScript, PERL, PHP, pipes, Python, WebObjects, and/or the like.
  • the mail server may support communications protocols such as, but not limited to: Internet message access protocol (IMAP), Messaging Application Programming Interface (MAPI)/Microsoft Exchange, post office protocol (POP3), simple mail transfer protocol (SMTP), and/or the like.
  • the mail server can route, forward, and process incoming and outgoing mail messages that have been sent, relayed and/or otherwise traversing through and/or to the MKTTM.
  • Access to the MKTTM mail may be achieved through a number of APIs offered by the individual Web server components and/or the operating system.
  • Mail clients may support a number of transfer protocols, such as: IMAP, Microsoft Exchange, POP3, SMTP, and/or the like.
  • a mail client may communicate to and/or with other components in a component collection, including itself, and/or facilities of the like. Most frequently, the mail client communicates with mail servers, operating systems, other mail clients, and/or the like; e.g., it may contain, communicate, generate, obtain, and/or provide program
  • a cryptographic server component 620 is a stored program component that is executed by a CPU 603, cryptographic processor 626, cryptographic processor interface 627, cryptographic processor device 628, and/or the like. Cryptographic processor interfaces will allow for expedition of encryption and/or decryption requests by the cryptographic component; however, the cryptographic component, alternatively, may run on a conventional CPU. The cryptographic component allows for the
  • the cryptographic component allows for both symmetric and asymmetric (e.g., Pretty Good Protection (PGP)) encryption and/or decryption.
  • PGP Pretty Good Protection
  • the cryptographic component may employ cryptographic techniques such as, but not limited to: digital certificates (e.g., X.509 authentication framework), digital signatures, dual signatures, enveloping, password access protection, public key management, and/or the like.
  • the cryptographic component will facilitate numerous (encryption and/or decryption) security protocols such as, but not limited to: checksum, Data Encryption Standard (DES), Elliptical Curve Encryption (ECC), International Data Encryption Algorithm (IDEA), Message Digest 5 (MD5, which is a one way hash function), passwords, Rivest Cipher (RC5), Rijndael, RSA (which is an Internet encryption and authentication system that uses an algorithm developed in 1977 by Ron Rivest, Adi Shamir, and Leonard Adleman), Secure Hash Algorithm (SHA), Secure Socket Layer (SSL), Secure Hypertext Transfer Protocol (HTTPS), and/or the like.
  • DES Data Encryption Standard
  • ECC Elliptical Curve Encryption
  • IDEA International Data Encryption Algorithm
  • MD5 Message Digest 5
  • Rivest Cipher Rijndael
  • RSA which is an Internet encryption and authentication system that uses an algorithm developed in
  • the MKTTM may encrypt all incoming and/or outgoing communications and may serve as node within a virtual private network (VPN) with a wider communications network.
  • the cryptographic component facilitates the process of "security authorization" whereby access to a resource is inhibited by a security protocol wherein the cryptographic component effects authorized access to the secured resource.
  • the cryptographic component may provide unique identifiers of content, e.g., employing and MD5 hash to obtain a unique signature for an digital audio file.
  • a cryptographic component may communicate to and/or with other components in a component collection, including itself, and/or facilities of the like.
  • the cryptographic component supports encryption schemes allowing for the secure transmission of information across a communications network to enable the MKTTM component to engage in secure transactions if so desired.
  • the cryptographic component facilitates the secure accessing of resources on the MKTTM and facilitates the access of secured resources on remote systems; i.e., it may act as a client and/or server of secured resources.
  • the cryptographic component communicates with information servers, operating systems, other program components, and/or the like.
  • the cryptographic component may contain, communicate, generate, obtain, and/or provide program component, system, user, and/or data communications, requests, and/or responses.
  • the MKTTM database component 619 may be embodied in a database and its stored data.
  • the database is a stored program component, which is executed by the CPU; the stored program component portion configuring the CPU to process the stored data.
  • the database may be a conventional, fault tolerant, relational, scalable, secure database such as Oracle or Sybase.
  • Relational databases are an extension of a flat file. Relational databases consist of a series of related tables. The tables are interconnected via a key field. Use of the key field allows the combination of the tables by indexing against the key field; i.e., the key fields act as dimensional pivot points for combining information from various tables. Relationships generally identify links maintained between tables by matching primary keys. Primary keys represent fields that uniquely identify the rows of a table in a relational database. More precisely, they uniquely identify rows of a table on the "one" side of a one-to-many relationship.
  • the MKTTM database may be implemented using various standard data-structures, such as an array, hash, (linked) list, struct, structured text file (e.g., XML), table, and/or the like. Such data-structures may be stored in memory and/or in (structured) files.
  • an object-oriented database may be used, such as Frontier, ObjectStore, Poet, Zope, and/or the like.
  • Object databases can include a number of object collections that are grouped and/or linked together by common attributes; they may be related to other object collections by some common attributes. Object-oriented databases perform similarly to relational databases with the exception that objects are not just pieces of data but may have other types of
  • MKTTM database is implemented as a data-structure
  • the use of the MKTTM database 619 may be integrated into another component such as the MKTTM component 635.
  • the database may be implemented as a mix of data structures, objects, and relational structures. Databases may be consolidated and/or distributed in countless variations through standard data
  • a Patients table for patients associated with an entity administering the magnetic resonance system 6i9d may include fields such as, but not limited to: patient_id, patient_name, patient_address, ip_address, mac_address, auth_key, port_num, security_settings_list, and/or the like.
  • An MR Studies table 6i9e may include fields such as, but not limited to: study_id, study_name, security_settings_list, study_parameters, resequences,
  • An RF sequences table 6i9f including a plurality of different rf pulse sequences may include fields such as, but not limited to: sequence_type, sequence_id, tip_angle, coil_selection, power_level, and/or the like.
  • a gradient sequences table 6i9g may include fields relating to different gradient field sequences such as, but not limited to: sequence_id, Gx, Gy, Gz, Gxy, Gxz, Gyz, Gxyz, field_strength, time_duration, and/or the like.
  • a raw MR data table 619I1 may include fields such as, but not limited to: study_id, time_stamp, file_size, patient_id, resequence, body_part_imaged, slice_id, and/or the like.
  • a Images table 6191 may include fields such as, but not limited to: image_id, study_id, file_size, patient_id, time_stamp, settings, and/or the like.
  • a Payment Legers table 6 ⁇ 3 ⁇ 4 may include fields such as, but not limited to: request_id, timestamp, payment_amount, batch_id, transaction_id, clear_flag, deposit_account, transaction_summary, patient_name, patient_account, and/or the like.
  • user programs may contain various user interface primitives, which may serve to update the MKTTM platform.
  • various accounts may require custom database tables depending upon the environments and the types of clients the MKTTM system may need to serve. It should be noted that any unique fields may be designated as a key field throughout.
  • these tables have been decentralized into their own databases and their respective database controllers (i.e., individual database controllers for each of the above tables). Employing standard data processing techniques, one may further distribute the databases over several computer systemizations and/or storage devices. Similarly, configurations of the decentralized database controllers may be varied by consolidating and/or distributing the various database components 6i9a-j.
  • the MKTTM system may be configured to keep track of various settings, inputs, and parameters via database controllers.
  • the MKTTM database may communicate to and/or with other components in a component collection, including itself, and/or facilities of the like. Most frequently, the MKTTM database communicates with the MKTTM component, other program components, and/or the like.
  • the database may contain, retain, and provide
  • any of the MKTTM node controller components may be combined, consolidated, and/or distributed in any number of ways to facilitate development and/or deployment.
  • the component collection may be combined in any number of ways to facilitate deployment and/or development. To accomplish this, one may integrate the components into a common code base or in a facility that can dynamically load the components on demand in an integrated fashion.
  • API Application Program Interfaces
  • DCOM Component Object Model
  • D Distributed
  • CORBA Common Object Request Broker Architecture
  • JSON JavaScript Object Notation
  • RMI Remote Method Invocation
  • SOAP SOAP
  • a grammar may be arranged to recognize the tokens of an HTTP post command, e.g.:
  • inter-application data processing protocols themselves may have integrated and/or readily available parsers (e.g., JSON, SOAP, and/or like parsers) that may be employed to parse (e.g., communications) data.
  • parsing grammar may be used beyond message parsing, but may also be used to parse: databases, data collections, data stores, structured data, and/or the like. Again, the desired configuration will depend upon the context, environment, and requirements of system deployment.
  • $sock socket_create(AF_INET, SOCK_STREAM, o);
  • the disclosure provides further implementations of methods, systems and machine readable programs that are related with the above disclosure.
  • NMR spectroscopy is well known in the art as a method of detecting the presence of a given molecule. The usual method for doing this is to put the sample or subject to be investigated a high field magnet with an associated NMR probe. Using well known NMR techniques, the nuclear magnetism of the molecules in the sample or subject may be manipulated to produce frequency dependent spectra. These spectra can be compared to existing databases to determine the presence and concentration of a given molecule.
  • embodiments are provided that overcome these drawbacks by exploiting properties of the superradiant condition. Specifically, the disclosed embodiments permit the presence of a given molecule to be determined a) at levels of concentration lower than those achievable and b) more rapidly than using present day NMR. In addition, the methods, systems and programs apply equally well to solids as to liquids, thus removing the limitation for high resolution NMR that the samples be in solution.
  • Equation 20 in the previous section implies that that the width and peaktime of an SR pulse is a function of the resonant frequency of the nuclei in a molecule as well as its concentration. Furthermore, in the limit where TR -> T2 t 0 is a strong function of TR which is in turn, assuming all other variables are held constant, a function of M 0 - N where N is the number of molecules in the FOV of the FEC. Thus, under certain circumstances changing the number of molecules of a given species in a study FOV can produce very sensitive changes in the resultant SR pulse. As a non exclusive example, a system of molecules that is held at or near the transition point between the normal and SR regimes is very sensitive to the addition of molecules of the same species.
  • a given concentration of nuclei can be kept at or very near the transition point between the two regimes.
  • These parameters can be controlled very precisely to closely define the normal to SR transition point for a given sample or subject. That is, for a given nuclei at a given concentration, there is a value of the probe quality factor Q, gradient G, and RF pulse excitation angle for which the sample or subject is at, or very near, the transition point between the normal and superradiant regimes.
  • in vivo serotonin concentrations in brain have been shown to be low in patients with depression and increase with administration of various antidepressants in a cohort of patients. Determining serotonin levels in blood do not represent values in brain. Although the serotonin metabolite 5 HIAA can be measured in the cerebrospinal fluid (CSF), this is much more difficult to access. While changes in serotonin concentration as a result of various drug therapies can be quite sharp, the overall concentration of in vivo serotonin ( ⁇ ng/ml) remains too low to be detectable in conventional MRS studies. Thus, a technique that could improve MR sensitivity to detect these low concentrations of serotonin may be helpful, in identifying subjects who may benefit from antidepressant therapy.
  • CSF cerebrospinal fluid
  • the small changes in the concentration of serotonin in vivo could be used to monitor the therapeutic response of subjects.
  • the SSR is filled with a known amount of serotonin or a similar target molecule and the FEC or other system parameters such as local field gradients adjusted so that so that the condition TR ⁇ T2 is achieved for the molecule in the SSR.
  • an SR pulse is produced from the target molecules in the SSR; the features of this pulse such as its width, peak time etc are stored.
  • a subject may be inserted in the MR device and an identical RF pulse sequence used to produce a pulse from both the target molecules in the SSR and the subject.
  • the resulting change in the features of the subsequent SR pulse may be used to determine the overall change in number of target molecules that resulted from insertion of the subject into the MR device, this can then be used to determine concentration levels of that target molecule in the subject
  • Tills process can be carried out singly or multiple times as desired. It may also be combined with various other pulse sequences to suppress unwanted resonances in the subject or sample.
  • standard RF pulse sequences such as WATERGATE, that are known in the art, or other methods disclosed herein can be used to substantially eliminate signal from water prior to carrying out the above sequence.
  • the process can also be implemented in conjunction with various calibration schemes.
  • the nuclei in the SSR can be characterized prior to introduction of the sample or subject by carrying out multiple SR pulse sequences with different gains and phase angles settings for the FEC.
  • the response of the nuclei in the SSR can be characterized under a wide variety of circumstances allowing for greater accuracy in identification and quantification of target molecules during the actual study.
  • Another embodiment would comprise introducing into the MR device, along with the SSR, a number of dummy samples containing various concentrations of the target molecule in phantoms that simulate the actual subject or sample environment. In this way the response of the system to a subject or sample containing an unknown amount of the target molecule can be calibrated against the data obtained in this calibration step.
  • a method and related system and machine readable program are provided for detecting the presence of a set of nuclei, molecules, molecular fragments, proteins and the like.
  • This can include preparing a control sample consisting in part or in whole of a molecule or molecules with known composition and concentration, as well as system components and machine readable programs that facilitate the same.
  • the disclosed embodiments can further include controlling at least one external parameter such as the ambient magnetic field, magnetic field gradient, quality factor of the NMR coil, and RF pulse angle so as to maintain the control sample at or near its SR transition.
  • the method can further include bringing into proximity with the control sample a target sample containing a molecule or molecules of unknown composition and concentration, and causing both the control sample and target sample to be subjected to RF excitation so as to cause the magnetic moment of at least one set of nuclei to have an angle greater than 90 "with respect to the ambient magnetic field.
  • the embodiments can still further include adjusting at least one ambient condition such as the magnetic field gradient so as to establish the change in the SR transition, and determining the composition and concentration of said target molecule or molecules by analyzing the data.
  • the disclosed embodiments can be combined with and/or employ equipment discussed herein above.
  • the SR state is not one that occurs under normal clinical MRSI conditions.
  • FEC Feedback Enabled Coil
  • SSR Supplementary Spin Reservoir
  • the SSR is a container with a predetermined concentration of one or more molecules that will be the target molecule(s) of the SR MRS.
  • the SSR is situated ex vivo and placed proximate to the sample or subject to be studied (for example a human or an animal) and within the field of view (FOV) of one or more FECs.
  • the nuclear magnetism from one or more molecules in a sample or subject contained in one or more FEC coils can be made to feedback upon itself.
  • these molecule(s) we describe these molecule(s) as being in the super-radiant "state" (SR).
  • the SR state is defined as being where TR ⁇ T2.
  • Clinical MR machines cannot normally produce the conditions necessary to produce TR ⁇ T2.
  • the present disclosure teaches, in addition to other teachings, methods and systems for achieving the SR state even for low concentrations of molecules in otherwise clinical conditions.
  • These teachings include: use of a feedback enabled coil so that the active Q of one or more FEC coils included in, or added to, an MR machine can be made very high, and the use of an SSR, preferably ex vivo, to ensure that one or more molecules in the MR machine are in the SR state.
  • NMR/MRI/MRS study so that the signal from another set of nuclei can be more easily detected and used to produce a useful and tangible result, such as a MR image, or to achieve detection of a particular chemical species.
  • Some implementations provide the suppression of the signal from fat in an in vivo MR study so that a superior image of water nuclei can be made by destroying the magnetization of the spins in the fat tissue.
  • Method (b) suffers from requiring a considerable time lag as the imaging study must wait for ln2*Tif a t before the signal from fat is sufficiently removed. Not only does this introduce a time lag, but during this period some signal from the water inevitably decays leading to poorer images.
  • Embodiments of the present disclosure overcome these drawbacks by exploiting properties of the superradiant condition. Specifically, such embodiments permit the signal from of a given ensemble of nuclei, such as protons in fat, to be destroyed very rapidly, such as in times less than T2. This can result in the production of widely separated pulses between nuclei in two or more different molecules or types of molecules, such as between protons in water and fat, so that the signal from one can be suppressed to allow superior images of the other to be made.
  • nuclei such as protons in fat
  • the peak time position of an SR pulse is a function, amongst other factors, of the number, Larmor frequency, and T2 of a given set of nuclei. These vary widely for the same nuclei in different molecules.
  • the ⁇ T 2 of water is - 800 msec in vivo.
  • the ⁇ T 2 is - 80 msec.
  • the amount of water and fat is different so their response to SR conditions is different.
  • t 0 ⁇ T2 meaning that the magnetization of a given set of nuclei can be driven very quickly to a desired angle with respect to the main magnetic field (B 0 ) of the MR system.
  • an SR pulse can be halted, or "cut", at any time via the imposition of a field gradient sufficient in strength to suppress SR conditions so that T2 ⁇ ⁇ 1 ⁇ 2 .
  • the SR pulse from water has a different time constant from that of fat. As described above, this is because there are different amounts of water than fat in the coil. In addition, the chemical shifts of fat and water differ slightly.
  • the SR time constant difference can be emphasized by centering the resonant frequency of the resonator on either the fat or water frequency.
  • the water ⁇ magnetization can be made to be very far from the x axis when the gradient is imposed, i.e., a very large fraction of the water magnetization can still be along the z axis while that from the fat is at z - o.
  • images can be made from water with minimal interference from unwanted fat signal.
  • the image can begin on timescales - 1 ⁇ 2 , which are much faster than - Ti as required by the method (b) described above.
  • FIG. 5 A further example of the separation of SR pulses is shown in Figure 5 for acetone and water. Water was placed in the inner compartment of a coaxial NMR tube, acetone in the outer. In a 700 MHz magnet the ⁇ spins in each molecule were simultaneously flipped using a pi pulse. The resultant SR pulses are easily distinguished from one another. As will be appreciated by those of skill in the art, these embodiments can be combined with and/or employ equipment, methods, machine readable programs and techniques described elsewhere herein.
  • a method for suppressing nuclear magnetization from one or more set of nuclei that includes:
  • a) providing a magnetic resonance device including (i) a main magnet for providing a background magnetic field along a first direction, (ii) at least one radio-frequency coil, and (iii) at least one gradient coil that can be controlled to define at least one region of interest;
  • the fat in an in vivo sample or subject could be made to be in SR conditions, while water is not, or vice versa.
  • an FEC and/or SSR can be used to produce these conditions
  • FIG. 1 A block diagram illustrating an exemplary computing environment in accordance with the present disclosure.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in accordance with the present disclosure.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in accordance with the present disclosure.
  • the RF pulses must be "soft"—that is to say, relatively long pulses of high intensity to achieve reasonable levels of spatial selection. These pulses can be of such long duration that local T 2 relaxation can begin to degrade sample or subject magnetization during the process. Also, spatial resolution of the reduced FOV produced in this manner can often be on the order of a cm or more; too large for many in vivo applications where the organ or anatomy of interest may be smaller than that.
  • the present methods, and related systems and computer programs overcome these drawbacks by exploiting properties of the superradiant pulse.
  • the SR pulse is very sensitive to the presence of field gradients to select out one region in which transverse magnetization can be permitted to survive.
  • the resolution of the FOV in the present technique is a function of the resolution of the field gradient; whereas in existing techniques it is a function of the resolution of the field. This allows greater control over the reduced FOV parameters.
  • the superradiant condition is defined as TR ⁇ T2.
  • the response of the system to an inversion of the nuclear magnetism to an angle greater than 90 degrees is a pulse rather than a Free Induction Decay (FID).
  • Second order shims produce field maps where the local gradient is very strong except in one region of space ( Figure 6). This region can be widened/narrowed, or moved in 3D, by adjusting the shim coils of the magnet.
  • Figure 7 shows examples of an image made from Mxy produced in local regions by establishing SR conditions in some parts of the sample or subject while destroying it in others. . Specifically, Figure 7 shows that, as expected, images made in this manner closely follow the local field gradient. Thus, by controlling the higher order shims it is possible to constrain the image to a reduced volume.
  • the sample was a 20 mm diameter water cylinder inside a 7 T magnet, probe Q - 300.
  • the magnet was well shimmed and then the z2 gradient was slightly perturbed to produce the field map shown in the upper half of the figure. Then the proton magnetization was inverted to 180 degrees. A crusher gradient removed any remaining transverse magnetization, after which a "kick" pulse of ⁇ 0.1 degree was applied to the sample. This produced an SR pulse with a peak time - 200 msec. The image at the bottom of the figure was made by "cutting" the SR pulse at - 200 msec and then imaging the resulting transverse magnetization using a standard FLASH sequence. The resulting image follows the field map produced by the z2 gradient closely.
  • SR conditions have been heretofore largely unknown in clinical MR because the requisite conditions— high magnetic field and/or high probe quality factor Q— are not produced by commercially available MR machines known in the art. SR conditions are a more common phenomenon in high field NMR studies, where they are generally considered an annoyance as their best known effect is to broaden the spectroscopic lines of the nuclei under observation. SR conditions are not desirable when one is trying to resolve the identity of many different molecules in a single sample, which is the goal typical of many NMR studies. The present disclosure recognizes that SR conditions can be a benefit when the goal is the identification and quantification of a single molecule to the exclusion of others in the field of view. By adding the notion of control, through the use of a Feedback Enabled Coil (FEC) and a Supplementary Spin reservoir (SSR) , SR enables powerful feedback-driven MR methods.
  • FEC Feedback Enabled Coil
  • SSR Supplementary Spin reservoir
  • ⁇ and a are the magnitude and phase of the gain factor generated by a feedback enabled coil
  • ⁇ is the gyromagnetic ratio
  • M 0 is the maximum value of the magnetization, which will be equal to thermal polarization.
  • MR scanners known heretofore in the art are not generally capable of producing the conditions required for SR. In addition, they are not typically set up as feedback-enabled devices.
  • One way to overcome these factors is to build a coil capable of producing feedback even under clinical MR conditions.
  • the coil/electronics are preferably able to adjust the phase of the magnetization as well as the gain of the feedback.
  • FEC Feedback Enabled Coil
  • FIG. 8 An example of a feedback system known in the art is shown in Figure 8.
  • a transmit/receive surface coil is employed in a typical manner.
  • any RF coil can be used, even receive-only coils, thus we will refer to this coil as the RF coil.
  • the output of the preamp is split off and fed into a feedback circuit.
  • the gain and phase may be any value with the potential to shorten the radiation damping constant to any desired value.
  • radiation damping can be turned on and off under system control via a pulse sequence.
  • the circuit of Figure 8 has two major shortcomings for a practical implementation of radiation damping.
  • the inductively coupled loop is loosely coupled to the RF coil. This is necessary to prevent the output of the feedback circuit to adversely affect the tune and match of the RF coil. Consequently, greater power is required by the feedback circuit then is necessary. To achieve small radiation damping constants, an improvement in efficiency is necessary to reduce power requirements.
  • a second shortcoming is that the signal coming from the RF coil has two significant components. One component is the RF signal arising from the magnetization of the spin system. The second component is the signal generated by the feedback circuit. Fortunately these two components are normally phase shifted by 90°, so that it is possible to maintain a stable mode of operation for the feedback circuit. While the inefficiency of the circuit helps to promote stability, the circuit will be sensitive to phase. With sufficient gain, there is the danger of creating positive feedback.
  • a component of the embodiment of Figure 9 is the quadrature hybrid block (indicated with a dashed block), which causes reflected power from the RF coil to appear on the output of this circuit but not upon the input.
  • This block can have different designs depending upon the type of RF coil employed.
  • the reflected power from the NMR coil will again have two components, one component from the spin system and the other component will be reflected power from mismatch with the coil.
  • Additional remote tuning/matching circuit(s) inside the quad hybrid block can minimize the reflected power due to any impedance mismatches while the NMR signal which arises from the spin system is not affected. This can minimize the undesirable component while maintaining an efficient coupling to the coil.
  • the circuit is further simplified by removing the transmitter and RF power amp from the figure.
  • the design of the quadrature hybrid block can vary depending upon the type of coil used. If a surface coil (or any coil that is considered linear) is used, then the quad hybrid block utilizes two quadrature hybrids and one remote matching circuit. If a quadrature coil is used then the quadrature hybrid block includes two remote matching circuits and one quadrature hybrid. This design is scalable to parallel imaging coil arrays.
  • a commercially available head coil e.g., Fig. 9A
  • Figure 10B e.g., single channel
  • a low power amplifier can be used initially ( ⁇ io watts) to test the feedback circuit, to insure against positive feedback, and to obtain initial results.

Landscapes

  • Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

Cette invention concerne différentes méthodes et différents systèmes permettant d'exécuter des examens par résonance magnétique. Conformément à plusieurs modes de réalisation, une image ou d'autres informations présentant un intérêt sont obtenues à partir d'impulsions de superradiance.
EP13813129.7A 2012-07-02 2013-07-02 Techniques, systèmes et programmes lisibles par machine pour examen par résonance magnétique Withdrawn EP2867657A4 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US201261667283P 2012-07-02 2012-07-02
US201261706102P 2012-09-26 2012-09-26
US201261706106P 2012-09-26 2012-09-26
US201261706100P 2012-09-26 2012-09-26
US201261733415P 2012-12-04 2012-12-04
US13/844,446 US9207298B2 (en) 2011-03-23 2013-03-15 Techniques, systems and machine readable programs for magnetic resonance
PCT/US2013/049014 WO2014008226A1 (fr) 2012-07-02 2013-07-02 Techniques, systèmes et programmes lisibles par machine pour examen par résonance magnétique

Publications (2)

Publication Number Publication Date
EP2867657A1 true EP2867657A1 (fr) 2015-05-06
EP2867657A4 EP2867657A4 (fr) 2016-05-11

Family

ID=49882457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13813129.7A Withdrawn EP2867657A4 (fr) 2012-07-02 2013-07-02 Techniques, systèmes et programmes lisibles par machine pour examen par résonance magnétique

Country Status (7)

Country Link
EP (1) EP2867657A4 (fr)
KR (1) KR101887736B1 (fr)
CN (1) CN104487830B (fr)
AU (1) AU2013286922A1 (fr)
CA (1) CA2878010A1 (fr)
IL (1) IL236503A0 (fr)
WO (1) WO2014008226A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112817811A (zh) * 2020-12-31 2021-05-18 深圳市联影高端医疗装备创新研究院 扫描失败率的预测方法、装置、设备及存储介质

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101650486B1 (ko) * 2015-09-01 2016-08-31 울산대학교 산학협력단 난류 운동 에너지 획득 장치 및 그 방법
EP3388854B1 (fr) * 2017-04-11 2020-09-16 Siemens Healthcare GmbH Couplage de radiocommunication normalisé entre une installation à résonance magnétique et un dispositif externe
CN107831094B (zh) * 2017-10-30 2020-04-07 中国人民解放军国防科技大学 基于碱金属原子弛豫率变化测量气体扩散常数的方法
CN108802648B (zh) * 2018-04-03 2020-12-01 上海东软医疗科技有限公司 一种基于梯度回波的磁共振定量成像方法和装置
CN113433156B (zh) * 2021-06-25 2024-04-12 中国矿业大学 基于核磁传感器的围海造陆地基含水量监测系统及方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1702271A1 (ru) * 1988-12-08 1991-12-30 Научно-производственное объединение Всесоюзного научно-исследовательского, проектно-конструкторского и технологического института кабельной промышленности Способ ЯМР-томографии
GB0001727D0 (en) * 2000-01-25 2000-03-15 Oxford Instr Uk Ltd Hyperpolarization of a noble gas
AU2002214039B2 (en) * 2000-11-03 2007-05-17 Ge Healthcare As Methods and devices for polarised NMR samples
US7053611B2 (en) * 2004-06-04 2006-05-30 Schlumberger Technology Corporation Method and apparatus for using pulsed field gradient NMR measurements to determine fluid properties in a fluid sampling well logging tool
US7781228B2 (en) * 2005-04-07 2010-08-24 Menon & Associates, Inc. Magnetic resonance system and method to detect and confirm analytes
WO2006137026A2 (fr) * 2005-06-24 2006-12-28 Koninklijke Philips Electronics N.V. Dispositif a resonance magnetique et procede associe
US7298142B2 (en) * 2005-06-27 2007-11-20 Baker Hughes Incorporated Method and apparatus for reservoir fluid characterization in nuclear magnetic resonance logging
US20100090693A1 (en) * 2008-10-14 2010-04-15 Wald Lawrence L Method and apparatus for controlling t1 recovery process in magnetic resonance measurements
WO2010045457A2 (fr) * 2008-10-15 2010-04-22 Regents Of The University Of Minnesota Découplage d’éléments bobinés pour irm

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112817811A (zh) * 2020-12-31 2021-05-18 深圳市联影高端医疗装备创新研究院 扫描失败率的预测方法、装置、设备及存储介质

Also Published As

Publication number Publication date
CA2878010A1 (fr) 2014-01-09
IL236503A0 (en) 2015-02-26
KR101887736B1 (ko) 2018-09-11
CN104487830A (zh) 2015-04-01
CN104487830B (zh) 2018-08-21
KR20150037917A (ko) 2015-04-08
WO2014008226A1 (fr) 2014-01-09
AU2013286922A1 (en) 2015-01-29
EP2867657A4 (fr) 2016-05-11

Similar Documents

Publication Publication Date Title
US20180168480A1 (en) Techniques, systems and machine readable programs for magnetic resonance
US9014785B2 (en) Techniques, systems and machine readable programs for magnetic resonance
KR101887736B1 (ko) 자기 공명을 위한 기술들, 시스템들 및 기계 판독가능 프로그램들
US20170322272A1 (en) Techniques, systems and machine readable programs for magnetic resonance
US8760159B2 (en) Method and apparatus for implementing EIT magnetometry
US20130154643A1 (en) Techniques, systems and machine readable programs for magnetic resonance
Reeder Emerging quantitative magnetic resonance imaging biomarkers of hepatic steatosis
US20140285192A1 (en) Techniques, systems and machine readable programs for magnetic resonance
Sjolander et al. Transition-selective pulses in zero-field nuclear magnetic resonance
Lee et al. An analytic expression for the ultimate intrinsic SNR in a uniform sphere
US20140266197A1 (en) Techniques, systems and machine readable programs for magnetic resonance
Liu et al. Radiofrequency pulse designs for three‐dimensional MRI providing uniform tipping in inhomogeneous B1 fields
WO2023178353A2 (fr) Techniques améliorées, systèmes améliorés et programmes améliorés lisibles par ordinateur pour la résonance magnétique
US20130253308A1 (en) Techniques, systems and machine readable programs for magnetic resonance
US20170082711A1 (en) Techniques, systems and machine readable programs for magnetic resonance
JP2015528719A (ja) 磁気共鳴のための改良された技法、システム及び機械可読プログラム
Giovannetti et al. Radio frequency coils for hyperpolarized 13C magnetic resonance experiments with a 3T MR clinical scanner: Experience from a cardiovascular Lab
Maxwell et al. Diffusive transfer of polarized 3He gas through depolarizing magnetic gradients
Theis Advances in Zero-Field Nuclear Magnetic Resonance Spectroscopy
Fiorito et al. Fast, interleaved, Look‐Locker–based T 1 mapping with a variable averaging approach: Towards temperature mapping at low magnetic field
Sapkota QUANTITATIVE IMAGING OF SPINAL CORD USING DIFFUSION MAGNETIC RESONANCE IMAGING
US20140378824A1 (en) Point-of-care non-invasive assay of lithium level

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20150126

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAX Request for extension of the european patent (deleted)
RA4 Supplementary search report drawn up and despatched (corrected)

Effective date: 20160412

RIC1 Information provided on ipc code assigned before grant

Ipc: G01N 24/08 20060101AFI20160406BHEP

Ipc: G01R 33/46 20060101ALI20160406BHEP

Ipc: G01R 33/36 20060101ALN20160406BHEP

Ipc: G01R 33/485 20060101ALN20160406BHEP

Ipc: G01R 33/48 20060101ALI20160406BHEP

Ipc: G01R 33/563 20060101ALN20160406BHEP

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20200717

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20210713