WO2013165573A1 - Procédés, systèmes et supports de stockage lisibles par ordinateur stockant des instructions pour l'imagerie et la détermination d'informations associées à des régions du cerveau - Google Patents

Procédés, systèmes et supports de stockage lisibles par ordinateur stockant des instructions pour l'imagerie et la détermination d'informations associées à des régions du cerveau Download PDF

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Publication number
WO2013165573A1
WO2013165573A1 PCT/US2013/030894 US2013030894W WO2013165573A1 WO 2013165573 A1 WO2013165573 A1 WO 2013165573A1 US 2013030894 W US2013030894 W US 2013030894W WO 2013165573 A1 WO2013165573 A1 WO 2013165573A1
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information
image data
region
image
processing
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PCT/US2013/030894
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English (en)
Inventor
Daniel E. HUDDLESTON
Xiaoping P. HU
Sinyeob AHN
Xiangchuan CHEN
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Emory University
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Priority to US14/395,140 priority Critical patent/US9600881B2/en
Priority to EP13784304.1A priority patent/EP2844143B1/fr
Publication of WO2013165573A1 publication Critical patent/WO2013165573A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves 
    • A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves  involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance 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
    • G01R33/5605—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution by transferring coherence or polarization from a spin species to another, e.g. creating magnetization transfer contrast [MTC], polarization transfer using nuclear Overhauser enhancement [NOE]
    • 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
    • G01R33/5608—Data processing and visualization specially adapted for MR, e.g. for feature analysis and pattern recognition on the basis of measured MR data, segmentation of measured MR data, edge contour detection on the basis of measured MR data, for enhancing measured MR data in terms of signal-to-noise ratio by means of noise filtering or apodization, for enhancing measured MR data in terms of resolution by means for deblurring, windowing, zero filling, or generation of gray-scaled images, colour-coded images or images displaying vectors instead of pixels

Definitions

  • Monoamine neurons such as dopaminergic, noradrenergic, and serotoninergic neurons, play important roles in the regulation of the motor, cognitive, affective, and arousal functions. These neurons are located in the brain stem, for example, in the substantia nigra pars compacta (SN), locus ceruleus (LC), ventral tegmental area (VTA), and ralphe nuclei (RN).
  • SN substantia nigra pars compacta
  • LC locus ceruleus
  • VTA ventral tegmental area
  • RN ralphe nuclei
  • neurodegenerative diseases for example, Parkinson's disease, progressive supranuclear palsy, Pick's disease, Alzheimer's disease, and Down's syndrome
  • pathological changes in the brain stem For example, neuronal loss of the SN and LC has been associated with Parkinson 's disease and neuronal loss in the LC has been associated with Alzheimer's disease.
  • dysregulation of monoamine neurons for example, in the noradrenergic, serotoninergic, and/or dopaminergic systems have been associated with psychiatric disorders, for example, depression and schizophrenia. See, e.g., M. Sasaki et al., Neuroreport, 2008 Nov 19; 19(17):1649-54.
  • Magnetic Resonance (MR) images have been identified as one way to detect pathological changes in the brain stem.
  • imaging the brain stem has been difficult due to its size and location and/or contrast resolution.
  • the disclosure relates to systems, methods, and computer-readable mediums storing instructions for generating MR images, for example, of a brain stem based on magnetic transfer contrast (MTC) effects.
  • the disclosure relates to systems, methods, and computer-readable mediums storing instructions for processing MR image data to determine and/or classify qualitative and/or quantitative information of a region of interest (also referred to as "region").
  • the disclosure may relate to a method for generating MR images.
  • the method may include acquiring image(s) of a region of interest of a subject.
  • the images may include acquiring MR images using a 3T system.
  • the acquiring may include applying or causing an application of a pre -pulse signal to a region of interest of the subject.
  • the region of interest may include region(s) of a brain of a subject, for example, a brain stem of a subject.
  • the pre -pulse signal may be specific to the MTC effects of the neuromelanin pigment and/or region(s) of interest of the treatment site, for example, the brain stem of a brain of the subject.
  • the pre -pulse may include parameters sufficient to saturate the region to be imaged.
  • the pre -pulse signal may have a flip angle of less than about
  • the flip angle may be less than about 350°. In some embodiments, the flip angle may be between about 150° and 425°. In some embodiments, the flip angle may be less than about 325°. In some embodiments, the flip angle may between 250° and 325°. In some embodiments, the flip angle may between 275° and 325°. In some embodiments, the flip angle may be about 300°. In some embodiments, the flip angle may be less than 300°.
  • the pre -pulse signal may be applied for a duration of about 10 ms. In some embodiments, the duration may be more or less than 10 ms.
  • the method may further include applying a pulse sequence to the region after the pre -pulse.
  • the pulse sequence may be based on a gradient echo sequence protocol.
  • the sequence may be 2D.
  • the parameters of the pulse sequence may be based on any known gradient echo sequence protocol.
  • the parameters of the pulse sequence may be based on a known turbo spin echo protocol specific to the region of interest, for example, the brain stem and/or neuromelanin pigment.
  • the steps of applying the pre -pulse and pulse sequence may be repeated for each slice. In some embodiments, the steps of applying the pre -pulse and pulse sequence may be repeated until all the data and/or measurements necessary to generate the image is acquired. In some embodiments, the steps may be repeated until a predetermined number of slices and/or MR data is obtained.
  • the method may include acquiring MR data. In some embodiments, the method may further include generating image data. In some embodiments, the generating may include processing the image data. In some embodiments, the processing the image data may include segmenting the image data.
  • the method may include determining quantitative information of the region or a portion of the region.
  • the determining may include determining quantitative information associated with the segmented image data.
  • the method may optionally include classifying the quantitative information according to a disease state.
  • the disease state may include but is not limited to Parkinson's disease, progressive supranuclear palsy, Pick's disease, Alzheimer's disease, and Down's syndrome, as well as psychiatric disorders.
  • the disease state may be based on a stored scale of disease states. In some embodiments, the stored scale may correspond to the progression of the disease(e.g., Parkinson's disease, progressive supranuclear palsy, Pick's disease, Alzheimer's disease, and Down's syndrome, as well as psychiatric disorders).
  • the method may include outputting the image data and/or information.
  • the information may include any one, some or all, but is not limited to the quantitative information of the region, the classification of the quantitative information, a comparison with previous quantitative information, and the like.
  • the outputting may include but is not limited to displaying the image data and/or quantitative information, printing the image data and/or quantitative information, and storing the image data and/or volume information remotely or locally.
  • the image data and/or quantitative information may be forwarded for further processing.
  • the quantitative information may include at least one of volume information, number of voxels, or contrast-to-noise ratio (CNR) information.
  • CNR contrast-to-noise ratio
  • the CNR (or MEAN CNR) and number of voxel may substantially correspond to amount of neuromelanin in the region and a number of neurons that contain neuromelanin, respectively.
  • the method may include segmenting the image data; and determining the contrast-to-noise ratio.
  • the disclosure may relate to a method for generating information associated with an image of at least one region of a subject.
  • the method may include determining at least quantitative information of the region from image data, the quantitative information include contrast-to-noise ratio information; and outputting the information.
  • the disclosure may relate to processing MR data to determine and/or classify quantitative and/or qualitative information of the region.
  • the region may include the brain stem of the subject.
  • the region may include but is not limited to the substantia nigra pars compacta (SN), locus ceruleus (LC), ventral tegmental area (VTA), and ralphe nuclei (RN).
  • the method may include receiving image data.
  • the image data may be acquired by a 3T MRI system from a MR scan that includes a prepulse signal and a pulse sequence according to a gradient echo imaging protocol, according to embodiments.
  • the image data may include a plurality of signal measurements acquired by a MR scan.
  • the image data may include a plurality of scans of a brain of a subject.
  • the method may include processing the image data.
  • the processing may include processing the image data to register the data to remove head motion artifact.
  • the processing may include selecting one signal measurement without head motion artifact from the received image data.
  • the method may include aligning all of the other measurements to the selected measurement.
  • the aligning step may be based on a linear registration technique.
  • the method may include discarding any of the aligned measurements that are above a certain threshold, the certain threshold corresponding to severe head motion.
  • the method may include averaging the remaining aligned measurements.
  • the processing may additionally or alternatively include processing the image data to aligning the image data in a common space.
  • the aligning step may include a step of aligning each image of the subject to acquired Tl images.
  • the processing may include converting the image data into the common space.
  • the converting may include converting the Tl images into the common space.
  • the converting may also include converting the images of the subject into the same common space based on the aligning and converting steps.
  • the processing may further include generating a mask of the at least one region of the brain, for example, the SN and/or LC regions.
  • the generating may include binarizing the region(s) as a mask on the neuromelanin images in the common space.
  • the method may further include analyzing the received image data.
  • the analyzing may include determining information from the image data.
  • the information may be quantitative and/or qualitative information or measurements of at least one region (e.g., the LC and/or SN regions of the brain).
  • the information may include but is not limited to disease state, quantitative information, metabolic information or measurements, physiologic information or measurements, as well as multimodal information or measurements.
  • the analyzing may include additional processing.
  • the analyzing may include segmenting the image data.
  • the image data may be aligned image data.
  • the segmenting may include defining a number (e.g., two) regions of interest (ROI)s.
  • the segmenting may be global region-based segmenting.
  • the analyzing may include determining quantitative information of at least one region.
  • the quantitative information may include any one, some or all, but is not limited to the quantitative of the region, the classification of the quantitative, a comparison with previous quantitative information, and the like.
  • the quantitative information may include at least one of volume information, number of voxels, or contrast-to-noise ratio (CNR) information.
  • CNR contrast-to-noise ratio
  • the CNR (or MEAN CNR) and number of voxel may substantially correspond to amount of neuromelanin in the region and a number of neurons that contain neuromelanin, respectively.
  • the volume information may be the product of the number of segmented voxels and the volume of a single voxel.
  • the method may include a step of classifying the information.
  • the information may be compared to previous information of the subject, for example, to provide information regarding the progression of the disease.
  • the information may be compared to information associated with many subjects, e.g., an atlas.
  • the comparing may include comparing the information to at least one predetermined range, each range being associated with a different disease state and/or progression of the disease state.
  • the disease state may include but is not limited to Parkinson's disease, progressive supranuclear palsy, Pick's disease, Alzheimer's disease, and Down's syndrome, as well as psychiatric disorders.
  • the method may include outputting the results.
  • the results may include the information, the image data, and at least one generated image.
  • the information may include any one, some or all, but is not limited to the quantitative and/or qualitative information associated with the LC and/or SN of the subject, the classification of the information with respect to previous information of the subject and/or prestored information associated with different disease states and/or progression of the disease state, and the like.
  • the outputting may include but is not limited to displaying the results, printing the results, and storing the results remotely or locally. In other embodiments, the results may be transmitted for further processing.
  • the disclosure may relate to a method of generating an atlas.
  • the atlas may be specific to regions of the brain, for example, the LC and/or the SC regions.
  • the processed image data may be used to generate an atlas for the SN and/or LC.
  • the method may include a step of receiving image data for a plurality of subjects.
  • the image data may have been already processed to generate masks for the SN and/or LC.
  • the method may include combining the image data for a plurality of subjects in the common space.
  • the method may include generating an atlas. The generating may include overlaying the combined masks onto Tl images in the common space.
  • the method may include outputting the atlas.
  • the outputting may include but is not limited to displaying the atlas (e.g., combined masks onto 2D Tl images), printing the atlas, and storing the atlas remotely or locally.
  • the atlas may be transmitted for further processing.
  • the method(s) may be an automatic method. In some embodiments, the method(s) may be performed by a computer having a memory and a processor. In some embodiments, the method(s) may be performed by an image acquisition system, for example, an MR system capable of using a gradient echo imaging protocol. In some embodiments, the MR system may be a 3T system.
  • a method may generate an image of a brain stem of a subject.
  • the method may include: acquiring image data of the brain stem using a 3T MRI system, the acquiring including applying a pre -pulse signal that has a flip angle between about 150° and 425° and pulse sequence according to a gradient echo imaging protocol; processing the image data; and generating the image.
  • a computer-readable storage medium may store instructions for generating MR images, determining quantitative information and/or classifying quantitative information.
  • the instructions may include: applying a pre-pulse signal to a region; applying a pulse sequence according to a gradient echo imaging protocol to the region; and acquiring MR image data.
  • the pre-pulse signal may have a flip angle of less than about 500°.
  • the flip angle may be between 150° and 425°.
  • the flip angle may be between about 250° and 350°.
  • the flip angle may be less than about 325°.
  • the flip angle may between 250° and 325°.
  • the flip angle may between 275° and 325°.
  • the flip angle may be about 300°. In some embodiments, the flip angle may be less than 300°.
  • the instructions optionally and/or alternatively may include any one, some or all of the following: processing the data; segmenting the processed data;
  • the processing may include instructions for outputting the information and/or image data.
  • the disclosure may relate to a system may be configured to generate MR images, determine quantitative information and/or classifying quantitative information.
  • the system may optionally include an MR system.
  • the MR system may be capable of applying a prepulse signal and a pulse sequence according to a gradient echo imaging protocol to a region, according to embodiments.
  • the MR system may be a 3T MR system.
  • the system may include a processor.
  • the processor may be configured to control an MR system.
  • the system may be configured to apply a pre-pulse signal to a region; apply a pulse sequence to a gradient echo imaging protocol to the region after the pre-pulse signal; and acquire image data.
  • the processor may be configured to process the image to determine the information associated with the region. In some embodiments, the processor may be configured to classify the information. [0039] In some embodiments, the disclosure may relate to a method of diagnosing for a disease state including Parkinson's disease, progressive supranuclear palsy, Pick's disease,
  • the method including determining at least quantitative information of the region from image data, the quantitative information including contrast-to-noise ratio information; classifying the quantitative information.
  • F3 ⁇ 4 jure 1 shows a method to generate an image information of a brain according embodiments
  • F3 ⁇ 4 jure 2 shows a method to acquire image data of a region of a brain
  • F3 ⁇ 4 jure 3 shows a method of post-processing the acquired image data
  • F3 ⁇ 4 jure 4 shows another method of post-processing the acquired image data
  • F3 ⁇ 4 jure 5 shows a method of generating quantitative information
  • F3 ⁇ 4 jure 6 shows a method of generating an atlas
  • F3 ⁇ 4 jure 7 shows a system configured to process an image of a brain to optionally generate information
  • F3 ⁇ 4 jure 8 shows an example of a generated image
  • F3 ⁇ 4 jure 9 shows an method of processing the image data
  • Figures 10(A) and (B) show an example of a generated image.
  • the embodiments of the disclosure are described with respect to an image of the brain, and more specifically, imaging and analyzing the brain stem of a subject.
  • the methods, systems, and the computer-readable storage mediums of the disclosure may analyze specific regions of interest, for example, regions of the brain stem including but not limited the substantia nigra pars compacta (SN), locus ceruleus (LC), ventral tegmental area (VTA), and ralphe nuclei (RN).
  • SN substantia nigra pars compacta
  • LC locus ceruleus
  • VTA ventral tegmental area
  • RN ralphe nuclei
  • the disclosure is not limited to the brain, and these regions of the brain, and may be applied to other regions of the brain, as well as other regions of interest (e.g., anatomical landmarks).
  • the methods, systems, and the computer-readable storage mediums according to embodiments address the deficiencies of conventional MRI imaging and systems.
  • the methods, systems, and the computer-readable storage mediums according to embodiments are directed to imaging techniques with magnetization transfer contrast (MTC) effects with less specific absorption rate (SAR).
  • MTC magnetization transfer contrast
  • SAR absorption rate
  • the methods, systems, and the computer-readable storage mediums according to embodiments address the limitations of other methods that reach the specific absorption rate (SAR) safety limit.
  • SAR absorption rate
  • Minzenberg et al. "Response to Comment on 'Modafinil Shifts Human Locus Coeruleus to Low-Tonic, High-Phasic Activity During Functional Mri,'" Science, 328 (2010), 309b; Sasaki M, Shibata et al., "Neuromelanin Magnetic Resonance Imaging of Locus Ceruleus and Substantia Nigra in Parkinson's Disease," Neuroreport, 17 (2006), 1215-18; and T. Schwarz et al., "Tl-Weighted Mri Shows Stage-Dependent Substantia Nigra Signal Loss in Parkinson's Disease,” Mov Disord, 26 (2011), 1633-8.
  • the methods and systems according to embodiments which use a GRE sequence (lower SAR than TSE) and a moderate powered MTC pulse approach, remain well under the SAR safety limit, and thereby allow the same protocol to be applied to all subjects regardless of body type while acquiring the same number of slices and covering LC and SN in all subjects.
  • the methods, systems, and the computer-readable storage mediums address the adverse effects of motion on image quality when imaging small neuromelanin containing structures.
  • the methods and systems acquire separate measurements during scanning, with subsequent coregistration in post-processing.
  • Intra-subject coregistration of NM-MRI signal measurement images based on anatomic landmarks reduces image blurring in LC and SN due to small amounts of motion. If a single measurement is significantly degraded by motion, it can be discarded. This approach differs from online averaging of multiple measurements, which does not afford the opportunity to coregister signal measurements to correct for motion, or to discard motion degraded measurements.
  • the method steps may cause or control the operation of an image acquisition device, for example, an MRI imaging system. It will be further understood that although the methods of the embodiments are discussed with respect to the actions of an imaging system and/or computer, the methods may be implemented using computer software to cause or control an MRI imaging system and/or computer system to perform these actions. It will also be understood that the methods according to the disclosure may be used with other types of image acquisition devices.
  • calculating may refer to the actions and processes of a computer system, or similar electronic computing device, that manipulates and transforms data represented as physical (e.g., electronic) quantities within the computer system's registers and memories into other data similarly represented as physical quantities within the computer system memories or registers or other such information storage, transmission or display devices.
  • Embodiments of the methods described herein may be implemented using computer software. If written in a programming language conforming to a recognized standard, sequences of instructions designed to implement the methods may be compiled for execution on a variety of hardware platforms and for interface to a variety of operating systems. In addition, embodiments are not described with reference to any particular programming language. It will be appreciated that a variety of programming languages may be used to implement embodiments of the disclosure.
  • Figure 1 illustrates a method 100 according to embodiments to analyze image data.
  • the method 100 may include a step 110 of receiving image data.
  • the image data may be MR image data of a brain of a subject.
  • the MR data may include a plurality of signal measurements acquired by a MR scan.
  • the image data may include a plurality of scans of a brain of a subject.
  • the MR data may be based on MTC effects.
  • the MR data may include a plurality of signal measurements acquired by a MR scan that includes a prepulse signal and a pulse sequence according to a gradient echo imaging protocol according to embodiments.
  • Figure 2 shows an example of a method 200 of acquiring MR image data according to embodiments.
  • the image data may be acquired by other methods.
  • Figure 2 illustrates a method 200 according to embodiments to acquire image data of a region of interest (also referred to as "region").
  • the method 200 may be for an execution on a magnetic resonance imaging (MRI) system comprising a magnet system and a controller for controlling the magnet system.
  • MRI magnetic resonance imaging
  • the MRI system may be a 3T MRI imaging system, for example, Siemens Tim Trio 3T MRI system. It will be understood that some steps of the method, for example, steps 210 and 220, may be based on a stored imaging protocol.
  • the method 200 may include a step 210 of applying a prepulse signal.
  • the pre -pulse signal may be applied to a treatment site, for example, a brain of a subject.
  • the pre -pulse signal may be specific to the MTC effects of the neuromelanin pigment and/or region(s) of interest of the treatment site, for example, the brain stem of a brain of the subject.
  • the pre -pulse may include parameters sufficient to saturate the region to be imaged.
  • the pre -pulse signal may have a flip angle of less than about
  • the flip angle may be less than about 425°. In some embodiments, the flip angle may be between about 150° and 425°. In some embodiments, the flip angle may be less than about 350°. In some embodiments, the flip angle may between about 250° and 350°. In some embodiments, the flip angle may between about 275° and 350°. In some embodiments, the flip angle may be about 300°. In some embodiments, the flip angle may be less than about 300°.
  • the pre -pulse signal may be applied for a duration of about 10 ms. In some embodiments, the duration may be less than 10 ms. In some embodiments, the duration may be about 2-6 ms. In other embodiments, the duration may be more than 10 ms.
  • the method 200 may further include a step 220 of applying a pulse sequence.
  • the pulse sequence may be based on a gradient echo sequence protocol. In some embodiments, the echo may be 2D. In some embodiments, the parameters of the pulse sequence may be based on any known gradient echo sequence protocol.
  • the parameters of the pulse sequence may be based on a known turbo spin echo protocol specific to the region of interest, for example, the brain stem and/or neuromelanin pigment. In other embodiments, some or all of the parameters of the pulse sequence may be modified.
  • the protocol may include the following parameters.
  • the minimum echo time (TE) may be less than about 10 ms.
  • the TE may be less than about 10 ms.
  • the TE may be from about 2-6 ms. In other embodiments, the TE may be more than 10 ms.
  • the minimum repetition per slice may be within about 15-30 ms per slice. In some embodiments, the TR may be about 20-25 ms per slice.
  • the image acquisition protocol flip angle may approximate the
  • the flip angle may be from about 40-45 degrees.
  • the effective slice orientation may be axially along the long axis of the brainstem, aligned perpendicular to the dorsal edge of the pons at midline (along the fourth ventricle). In other embodiments, the slice orientation may be different.
  • the resolution may be within the range of about 0.2mm X 0.2 mm in plane to about 0.7 mm X 0.7mm in plane and the slice thickness may be within the range of about 1.5 mm to about 4.5 mm. In some embodiments, the resolution may be about 0.4mm X 0.4 MM in plane with a slice thickness of about 3 mm. In some embodiments, a high spatial resolution of about 0.4 mm may be desired.
  • a 512 matrix side may be administered along the readout direction and smaller sizes may be used along the phase-encoding direction when a small field-of-view (FOV) along the phase-encoding (PE) direction is used.
  • FOV field-of-view
  • PE phase-encoding
  • the number of slices and slice thickness may vary between subjects.
  • the slices may be positioned to allow the most superior and inferior slices along the axis of the brainstem to be discarded as both edge slices show different image contrasts relative to other inner slices.
  • the number may be about 8-15 slices depending on the regions of interest.
  • the slice thickness may be about 3 mm. For example, if imaging both LC and SN, about 15 slices may be acquired. If imaging the SN or LC only, about 8 slices may be acquired.
  • the protocol may include different parameters.
  • the steps 210 and 220 may be repeated for each region until all the data necessary is acquired, as shown in step 230.
  • the image data for the scan(s) may be acquired in step
  • the method may optionally include a step 250 of generating image data in step 250.
  • the image data may be generated according to known MR known techniques.
  • the generating step may further include processing the image data.
  • the image data may be corrected for attenuation and/or motion before being generated.
  • the image data may be further processed according to known techniques so as to improve the appearance of the brain stem before the image data is generated.
  • the method 200 may include additional steps shown in Figures 3 and/or 4 before the image data is generated in step 250.
  • the method 200 may include a step 260 of outputting the generated image data.
  • the outputting may include but is not limited to displaying the image(s), printing the image(s), and storing the image(s) remotely or locally.
  • the image(s) may be forwarded for further processing.
  • the method of acquiring image data overcomes the deficiencies of other neuromelanin MRI contrast techniques.
  • the method maximizes neuromelanin contrast generated by MTC effect while manages the practical consequences of the additional delivery of electromagnetic energy resulting from the use of MTC pulses.
  • the method 100 may further include a step of 120 of processing the image data.
  • the step 120 may optionally include one, some or all of the steps of methods 300 and/or 400 shown in Figures 3 and 4, respectively.
  • one, some or all of the steps of the methods 300 and 400 may be optionally included in step 250.
  • the methods 300 and/or 400 may be performed after acquiring MR image data of a subject.
  • the steps of methods 300 and 400 may be performed automatically or may be performed with some user intervention.
  • the method 100 may include additional or alternative known post-processing methods.
  • the method 300 may be directed to processing the image data to register the multiple signal measurements, for example, acquired by the method 200, to remove head motion artifact.
  • the method 300 may include a step 310 of selecting one measurement without head motion artifact from the received image data. After the measurement is selected, the method 300 may further include a step 320 of aligning all of the other measurements included in the image data received to the selected measurement.
  • the aligning step 320 may be based on a linear registration technique.
  • the linear registration technique may be any known technique, for example, 3dvolreg of the Analysis of Functional Neurolmages (AFNI). See
  • the method 300 may include a step of 330 of discarding certain measurements.
  • the discarded measurements may include those measurements that cannot be reliably corrected, for example, those with head motion that is above a threshold, such as those with severe head motion. In some embodiments, this step may be omitted.
  • the remaining aligned measurements may be averaged in step 340.
  • the averaged measurements/data may then be outputted in step 350.
  • the outputting may include but is not limited to displaying the averaged measurements as image(s) and/or data, printing the averaged measurements, and storing the averaged measurements remotely or locally.
  • the averaged measurements may be outputted or transmitted for further processing and analyzing.
  • the method 300 allows for small amounts of motion to be corrected and significantly motion degraded measurements to be discarded. This method addresses the deficiencies associated with imaging the brain, for example, the LC and SN regions. Because LC and SN are small structures, MRI can be challenging in these locations as small amounts of motion can substantially destroy their signals.
  • the method 400 may be directed to processing the image data to register the each of the subject's images into a common space.
  • the method 400 may be performed using image data for which head artifacts have been removed, for example, by the method 300.
  • the method 400 may be performed using other corrected or non-corrected image data.
  • the method 400 may include a step 410 of aligning each image
  • Tl images e.g., neuromelanin image
  • Tl images for example, mprage images, that cover the whole brain image.
  • Any well-known alignment program may be used, for example,
  • the method may include step 420 of converting the image data into common space.
  • the step 420 of converting may include converting the Tl images into a common space (e.g., Talairach space).
  • the step 420 may also include converting the neuromelanin images of the subject into the same common space based on the aligning and converting (converting the Tl image) steps. Any well-known conversion program, may be used, for example, @auto_tlrc of AFNI may be used.
  • the method 400 may include a step 430 of generating a mask of at least one region, for example, the SN and/or LC regions.
  • the step 430 may include binarizing the region(s) (e.g., SN and LC regions) as a mask on the neuromelanin images in the common space. Any well-known conversion program, may be used, for example, 3dcalc of AFNI may be used.
  • Figure 8 shows an example of a generated and acquired image.
  • the method 100 may optionally include a step of 130 of analyzing the image data to determine qualitative and/or quantitative information, for example, of the neurodegeneration of the subject.
  • the information may include but are not limited to disease state, volume information of region(s) of the brain (e.g., the LC and/or SN regions of the brain), metabolic information, physiologic information, contrast to noise ratio (CNR), as well as multimodal information.
  • Figure 5 illustrates a method of determining quantitative information of at least one region of the brain, e.g., the LC and/or SN regions, according to embodiments.
  • Quantitative information may include but is not limited to volume information, contrast-to-noise ratio (CNR) information, and/or number of voxels ,as well as other types of quantitative information.
  • CNR contrast-to-noise ratio
  • MEAN contrast-to-noise ratio
  • number of voxel may substantially correspond to the amount of neuromelanin present and the number of neurons that contain neuromelanin.
  • the step 130 of determining qualitative and/or quantitative information may include alternative or additional steps. It may include any well-known methods of determining such information.
  • the method 500 may further include a step 510 of further processing the image data.
  • the processing step 510 may include automatically segmenting the image data for a specific region, for example, the LC and/or SN of the brain.
  • the image data may be initially registered to remove head motion artifact, for example, as shown in Figure 3.
  • the step 510 may be included in the method 300.
  • the processing step 510 may be a global region-based segmentation.
  • the step 510 may include causing the boundary of that region to be discontinuous.
  • the segmenting step may include applying a region-based snake algorithm, such as the Chan-Vese algorithm. See, for example, Tony F. Chan et al., "Active Contours without Edges,” IEEE Trans Image Proc 2001; 10(2):266-277, which is hereby incorporated in its entirety.
  • the step 510 may include defining a number (e.g., two) regions of interest (ROI)s, corresponding to the LC and/or SN on each side based on known landmarks. These landmarks may be identified, for example, by known neuroanatomic and stereologic study of those regions. See D. C. German, et al, "The Human Locus Coeruleus: Computer Reconstruction of Cellular Distribution," J. Neurosci., 8 (1988), 1776-88, which is hereby incorporated in its entirety. Then, the segmenting step 510 may include applying an active contour technique to the ROIs, which are known to contain the region, e.g., the LC and/or SN. This may result in the ROIs being lOx interpolated in each dimension to increase the smoothness of the contour because not many pixels would be contained in the region at a given MR imaging resolution.
  • ROI regions of interest
  • the step 510 may be optimized.
  • the input parameters to the algorithm may be optimized in such a way that the segmented region (e.g., LC and/or SN regions) resembles an actual region (e.g., LC and/or SN) by radiologists' readings.
  • these parameters may be used throughout the image processing as all (e.g., LC and/or SN) images from 2D gradient-echo (GRE) imaging with MTC would provide similar image intensities and overall contrast.
  • GRE 2D gradient-echo
  • the step 510 may include other methods of segmentation.
  • Figure 9 illustrates a method 900 of segmentation according to some embodiments.
  • the image data may be initially registered to remove head motion artifact, for example, as shown in Figure 3.
  • the step 510 may be included in the method 300.
  • the method 900 may include a step 910 of disposing a number of target regions of interests (ROI) corresponding to the region.
  • ROI target regions of interests
  • ROIs may be a circle having a diameter of about 6mm. In other embodiments, the target ROIs may have a different shape. In some embodiments, the number of target ROIs may be about 2 ROIs for each slice. In other embodiments, there may be more or less target ROIs for each slice. In some embodiments, target ROIs may be disposed for 4 consecutive slices starting from the bottom or top slice. In other embodiments, target ROIs may be disposed for more or less slices.
  • the target ROIs may be disposed in areas surrounding the region.
  • target ROIs may be placed in the pons close to the possible LC locations.
  • the LC locations may be disposed from top one in which the fourth ventricle just appears.
  • the target ROIs may be placed in tissues surrounding the SN.
  • target ROIs may be placed in the pons close to the possible LC locations.
  • the LC locations may be disposed from top one in which the fourth ventricle just appears.
  • target ROIs (with circles of about 6mm) can be disposed in tissues surrounding the SN for 4 consecutive slices, starting from the bottom one, which barely showed the SN.
  • 2 ROIs can be disposed flanking both the right and left SNs.
  • the method 900 may include a step 920 determining signal intensity for each Target ROIs.
  • the step 920 may include first verifying that the voxel intensities for the ROIs as approximately normally distributed.
  • the step 920 may include determining the Mean (l mean ) and standard deviation (I sd ) of signal intensity for the target ROIs.
  • the intensity difference (I d i f r ) for each voxel may then be calculated.
  • X may depend on the region to be analyzed. For example, for SN, X may be 3; and for LC, x may be 4.
  • the method 900 may include a step 930 of generating a binary map.
  • the step 930 may include defining the ROIs on the binary map.
  • the ROIs may be confined. For example, for the LC, the ROIs may be confined in two circles (6 mm in diameter, centered 3 mm lateral and 2 mm posterior to the apex of the fourth ventricle, one on the left and one on the right).
  • Figures 10A and 10B show an example of an image of the SN.
  • Figure 10A shows an image from a subject showing the SN.
  • the image was acquired using a 3.0 Tesla Siemens Magnetom TRIO scanner (Siemens Medical Solutions, Malvern, PA) using a 2D gradient echo sequence with magnetization transfer contrast (MTC) preparation pulse.
  • Figure lB-1 shows target ROIs (circles with diameter in 6 mm) placed in the tissues surrounding the SN for 4 consecutive slices, starting from the bottom one which barely showed the SN. Each slice has2 ROIs, flanking both the left and right SNs.
  • Figure 10B-2 shows voxel intensities of these ROIs that were verified as approximately normally distributed.
  • Figure 10B-3 shows a generated binary map.
  • Figure 10B-4 shows ROIs for the SN that were defined on the binary map, which did not require an accurate delineation of the SN.
  • the method may optionally or additionally include a step 520 of determining quantitative information.
  • the determining may include determining volume information.
  • the volume information may include any one, some or all, but is not limited to the volume of at least one region of the brain (e.g., LC and/or SN), or the voxels identified as the region (e.g., LC and/or SN).
  • the volume information may be an estimate of the volume.
  • the determination of the volume information may be based on other known volume algorithms
  • the step 520 may include determining contrast-to-noise ratio
  • the MEAN CNR may be determined for the region.
  • the step 520 may include determining number of voxels may be calculated for the region. The MEAN CNR and number of voxel may substantially correspond to the amount of neuromelanin present and the number of neurons that contain neuromelanin.
  • the determination of the contrast-to-ratio information may be based on other contrast-to-noise ratio algorithms.
  • the step 520 may include determining other quantitative information.
  • the method may further include a step 530 of outputting the quantitative information.
  • the quantitative information may be outputted with the image data in step 160.
  • the outputting may include but is not limited to displaying the quantitative information, printing the quantitative information, and storing the quantitative information remotely or locally.
  • the quantitative information may be forwarded for further processing.
  • the quantitative may also include the voxels identified as the region of interest, e.g., LC and/or SN.
  • the method 100 may optionally include a step 140 of classifying the quantitative and/or qualitative information.
  • the information may be compared to previous information of the subject, for example, to provide information regarding the progression of the disease.
  • the information may be compared to information associated with many subjects, e.g., an atlas.
  • the comparing may include comparing the information to a predetermined ranges associated with the information, each range being associated with a different disease state and/or progression of the disease state.
  • the disease state may include but is not limited to Parkinson's disease, progressive supranuclear palsy, Pick's disease, Alzheimer's disease, and Down's syndrome, as well as psychiatric disorders.
  • the disease state may be based on any known scale.
  • the method may further include a step 150 of outputting the results.
  • the results may include the information, the processed image data, and/or the image(s) based on the processed image data.
  • the information may include any one, some or all, but is not limited to the quantitative information of the region (e.g., LC and/or SN) (e.g., volume, CNR, number of voxels, etc.), the classification of the information with respect to previous information of the subject and/or prestored information associated with different disease states and/or progression of the disease state, and the like.
  • the outputting may include but is not limited to displaying the results, printing the results, and storing the results remotely or locally. In other embodiments, the results may be transmitted for further processing.
  • the processed image data may be used to generate an atlas for the a region, for example, SN and/or LC.
  • Figure 6 shows a method 600 according to embodiments to generate an atlas of region(s) of the brain stem, for example, the SN and/or the LC.
  • the method may include a step 610 of receiving image data for a plurality of subjects.
  • the image data may have been already processed to generate masks for the SN and/or LC.
  • the step 610 may include the steps provided in the method 400.
  • the method 600 may include a step 620 of combining the image data for a plurality of subjects in the common space.
  • the combing technique may be any known technique, for example, 3dcalc of the Analysis of Functional Neurolmages (AFNI).
  • the method 600 may include a step 630 of generating the atlas.
  • the step 630 may include overlaying the combined masks onto Tl images in the common space.
  • the method may include a step 640 of outputting the atlas.
  • the outputting may include but is not limited to displaying the results (e.g., combined masks onto 2D
  • Tl images Tl images
  • printing the results Tl images
  • storing the results remotely or locally the results may be transmitted for further processing.
  • FIG. 7 shows an example of a system 700 for processing and generating image data and determining information.
  • the system for carrying out the embodiments of the methods disclosed herein is not limited to the system shown in Figure 7. Other systems may be used.
  • the system 700 may include any number of modules that communicate with other through electrical or data connections (not shown).
  • the modules may be connected via a wired network, wireless network, or combination thereof.
  • the networks may be encrypted.
  • the wired network may be, but is not limited to, a local area network, such as Ethernet, or wide area network.
  • the wireless network may be, but is not limited to, any one of a wireless wide area network, a wireless local area network, a Bluetooth network, a radio frequency network, or another similarly functioning wireless network.
  • modules of the system are shown as being directly connected, the modules may be indirectly connected to one or more of the other modules of the system. In some embodiments, a module may be only directly connected to one or more of the other modules of the system.
  • the system may omit any of the modules illustrated and/or may include additional modules not shown. It is also be understood that more than one module may be part of the system although one of each module is illustrated in the system. It is further to be understood that each of the plurality of modules may be different or may be the same. It is also to be understood that the modules may omit any of the components illustrated and/or may include additional component(s) not shown.
  • the modules provided within the system may be time synchronized.
  • the system may be time synchronized with other systems, such as those systems that may be on the medical facility network.
  • the system 700 may include an image acquisition device 710 configured to acquire the image data of a subject.
  • the image acquisition device 710 may be any device configured to generate and acquire images from a magnetic resonance imaging (MRI) scan.
  • the image acquisition device 710 may be any known MR dedicated system capable of Gradient Echo imaging.
  • the MR system may be a 3T MR system.
  • the system 700 may communicate with the imaging systems and/or a data storage device.
  • the system may include one or more data repositories 712, such as radiological image storage (e.g., Picture Archiving and Communication System (PACS)).
  • PACS Picture Archiving and Communication System
  • the image acquisition device 710 may include a computer system to carry out the image processing.
  • the computer system may further be used to control the operation of the system or a separate system may be included.
  • the system 700 may include a computer system 720 to carry out the image processing, generating and/or analyzing.
  • the computing system 720 may be a separate device.
  • the computing system 720 may be a part (e.g., stored on the memory) of other modules, for example, the image acquisition device 710, and controlled by its respective CPUs.
  • the computer system 720 may further be used to control the operation of the image acquisition device 710 or a computer separate system may be included.
  • the computer system 720 may also be connected to another computer system as well as a wired or wireless network.
  • the computer system 720 may receive or obtain the image data from the image acquisition device 710 or from another module, such as a hospital server provided on a network.
  • the system 720 may be a computing system, such as a workstation, computer, or the like.
  • the system 720 may include one or more processors 722.
  • the processor(s) 722 (also referred to as central processing units, or CPUs) may be any known central processing unit, a processor, or a microprocessor.
  • the CPU 722 may be coupled directly or indirectly to one or more computer - readable storage medium (e.g., memory) 724.
  • the memory 724 may include random access memory (RAM), read only memory (ROM), disk drive, tape drive, etc., or a combinations thereof.
  • the memory may also include a frame buffer for storing image data arrays.
  • the CPU 722 may be configured to control the image acquisition and may be configured to process the acquired images. In some embodiments, the CPU 722 may be capable of performing the image processing functionality. In other embodiments, the system may include a separate CPU for performing the image processing functionality.
  • the CPU 722 may be configured to process the image data acquired from the image acquisition device 710.
  • the system 700 may include one or more image processors 726 (e.g., any known processing unit such as a CPU, a processor, or a microprocessor) configured to process raw image data. The processed data and results may then be stored in the memory 724.
  • another computer system may assume the image analysis or other functions of the CPU 722 or image processor 726.
  • the image data stored in the memory 724 may be archived in long term storage or may be further processed by the image processor and presented on a display.
  • the disclosed methods may be implemented using software applications that are stored in a memory and executed by a processor (e.g., CPU) provided on the system.
  • the disclosed methods may be implanted using software applications that are stored in memories and executed by CPUs distributed across the system.
  • the modules of the system may be a general purpose computer system that becomes a specific purpose computer system when executing the routine of the disclosure.
  • the modules of the system may also include an operating system and micro instruction code.
  • the various processes and functions described herein may either be part of the micro instruction code or part of the application program or routine (or combination thereof) that is executed via the operating system.
  • various other peripheral devices may be connected to the computer platform such as an additional data storage device, a printing device, and other I/O (input/output) devices.
  • the system 720 may include a communication interface 730 configured to conduct receiving and transmitting of data between other modules on the system and/or network.
  • the communication interface 730 may be a wired and/or wireless interface, a switched circuit wireless interface, a network of data processing devices, such as LAN, WAN, the internet, or combination thereof.
  • the communication interface may be configured to execute various
  • communication protocols such as Bluetooth, wireless, and Ethernet, in order to establish and maintain communication with at least another module on the network.
  • the system 700 may include an input/output interface 728 configured for receiving information from one or more input devices 740 (e.g., a keyboard, a mouse, and the like) and/or conveying information to one or more output devices 742 (e.g., a printer, a CD writer, a DVD writer, portable flash memory, etc.).
  • the one or more input devices 740 may configured to control the generation of the images, display of images on a display, and/or printing of the images by a printer interface.
  • the embodiments of the disclosure be implemented in various forms of hardware, software, firmware, special purpose processes, or a combination thereof.
  • the disclosure may be implemented in software as an application program tangible embodied on a computer readable program storage device.
  • the application program may be uploaded to, and executed by, a machine comprising any suitable architecture.
  • the system and method of the present disclosure may be implemented in the form of a software application running on a computer system, for example, a mainframe, personal computer (PC), handheld computer, server, etc.
  • the software application may be stored on a recording media locally accessible by the computer system and accessible via a hard wired or wireless connection to a network, for example, a local area network, or the Internet.

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Abstract

L'invention porte sur des procédés, des systèmes et des supports de stockage lisibles par ordinateur qui concernent des techniques d'imagerie d'une région, par exemple le cerveau, avec des effets de contraste de transfert d'aimantation (MTC) à plus faible taux d'absorption spécifique (SAR). Les procédés, les systèmes et les supports de stockage lisibles par ordinateur peuvent consister à acquérir des données d'image MR à partir d'au moins un balayage de résonance magnétique (MR) qui comprend un signal de pré-impulsion et une séquence d'impulsions. Le signal de pré-impulsion peut être inférieur à 500°, par exemple d'environ 150° à 425°, et la séquence d'impulsions peut être une séquence à base d'écho de gradient. Les procédés, les systèmes et les supports de stockage lisibles par ordinateur peuvent consister à générer des informations associées à une image d'au moins une région d'un sujet. Les informations peuvent comprendre des informations quantitatives ou qualitatives d'une région d'un cerveau. Les informations quantitatives peuvent comprendre des informations de volume, des informations de rapport contraste sur bruit, un nombre de voxels, ainsi que d'autres informations.
PCT/US2013/030894 2012-05-04 2013-03-13 Procédés, systèmes et supports de stockage lisibles par ordinateur stockant des instructions pour l'imagerie et la détermination d'informations associées à des régions du cerveau WO2013165573A1 (fr)

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