CN109725274B - Magnetic resonance spectrum scanning and scanning adjusting method, device, equipment and storage medium thereof - Google Patents
Magnetic resonance spectrum scanning and scanning adjusting method, device, equipment and storage medium thereof Download PDFInfo
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- CN109725274B CN109725274B CN201811645804.1A CN201811645804A CN109725274B CN 109725274 B CN109725274 B CN 109725274B CN 201811645804 A CN201811645804 A CN 201811645804A CN 109725274 B CN109725274 B CN 109725274B
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Abstract
The invention discloses a magnetic resonance spectrum scanning and a scanning adjusting method, a device, equipment and a storage medium thereof, wherein the method comprises the following steps: collecting a water signal of a target area of a target object at a target collection moment; performing feature extraction on the water signal to obtain the spectral characteristic of the water signal; adjusting scan parameters of the magnetic resonance spectroscopy scan based on at least one of the spectral characteristics. The technical scheme of the embodiment of the invention realizes that the scanning parameters of the magnetic resonance spectrum scanning are adjusted according to the spectrum characteristics of the water signal of the target object in the magnetic resonance spectrum scanning, thereby not only ensuring the quality of the scanned image, but also saving the scanning time and the scanning cost.
Description
Technical Field
The embodiment of the invention relates to the technical field of magnetic resonance spectrum scanning, in particular to magnetic resonance spectrum scanning and a scanning adjusting method, a device, equipment and a storage medium thereof.
Background
Magnetic Resonance Spectroscopy (MRS) is a detection method that uses the phenomenon of magnetic resonance chemical shift to determine the molecular components of constituent substances, and is also the only examination method that can currently determine the chemical components and contents of metabolites in living tissues. Hydrogen proton (1H) spectroscopy is currently in common use. Because the magnetic resonance frequency of 1H in different compounds is different, the positions of resonance peaks in the spectral line of MRS are different, the properties of the compounds can be judged according to the positions, and the peak height and the area of the resonance peaks reflect the concentration of the compounds, so that quantitative analysis can be carried out. Magnetic resonance spectroscopy is a new technique for non-invasive studies of in vivo organ tissue metabolism, biological changes and quantitative analysis of compounds, and is increasingly used in the diagnosis of certain diseases. However, the measurement of magnetic resonance spectra is very sensitive to the motion of the scanned person. In order to obtain good spectral lines, longer scanning time is often required, and especially in multi-voxel imaging, the time is multiplied due to the increase of the encoding times along with the increase of the resolution. However, in long-time scanning, a scanned person often generates involuntary large-scale movements such as swallowing, coughing and even rotating, so that a uniform field region and an interested imaging region are changed, a scanning result is deteriorated, and even spectral lines cannot be used.
In the prior art, a technician usually observes the spectrum result after the magnetic resonance spectrum is finished, and if the imaging quality is poor, the spectrum result needs to be rescanned, which wastes a great deal of time and cost. The prior art can not prompt a technician to rescan in time by detecting the motion amplitude of a person to be scanned.
Disclosure of Invention
The embodiment of the invention provides a magnetic resonance spectrum scanning and a scanning adjusting method, a device, equipment and a storage medium thereof, so as to ensure the accuracy of the magnetic resonance spectrum scanning.
In a first aspect, an embodiment of the present invention provides a method for adjusting a magnetic resonance spectroscopy scan, including:
acquiring a water signal of a target area of a target object at a target acquisition time, wherein the target acquisition time comprises at least one preset time before starting and/or during a magnetic resonance spectroscopy scan;
performing feature extraction on the water signal to obtain a spectral characteristic of the water signal, wherein the spectral characteristic comprises at least one of water signal chemical shift, half-peak height and width and curve symmetry;
adjusting scan parameters of the magnetic resonance spectroscopy scan based on at least one of the spectral characteristics.
In a second aspect, an embodiment of the present invention further provides a magnetic resonance system spectrum scanning method, where the magnetic resonance system includes a monitoring module and an imaging module, the monitoring module sets a monitoring sequence, and the imaging module sets an imaging sequence, and the method includes:
exciting a target area of a target object by using a monitoring sequence to obtain a monitoring signal;
determining the motion state of the target area or the state of the magnetic resonance system according to the monitoring signal;
under the condition that the motion state of the target area or the state of the magnetic resonance system meets a set condition, exciting the target area of the target object by using an imaging sequence to acquire an imaging signal;
and acquiring a spectrum image of the target area according to the imaging signal.
In a third aspect, an embodiment of the present invention further provides a magnetic resonance spectroscopy scan adjusting apparatus, including:
a signal acquisition module for acquiring a water signal of a target region of a target object at a target acquisition time, wherein the target acquisition time comprises at least one preset time before starting a magnetic resonance spectrum scan and/or during the magnetic resonance spectrum scan;
the water signal processing module is used for extracting the characteristics of the water signal to obtain the spectral characteristics of the water signal, wherein the spectral characteristics comprise at least one of water signal chemical shift, half-peak height and width and curve symmetry;
a scan parameter adjustment module for adjusting scan parameters of the magnetic resonance spectroscopy scan according to at least one of the spectral characteristics.
In a fourth aspect, an embodiment of the present invention further provides a magnetic resonance system spectrum scanning apparatus, where the magnetic resonance system includes a monitoring module and an imaging module, the monitoring module sets a monitoring sequence, the imaging module sets an imaging sequence, and the magnetic resonance system spectrum scanning apparatus includes:
the monitoring signal acquisition module is used for exciting a target area of a target object by using a monitoring sequence so as to acquire a monitoring signal;
the state determination module is used for determining the motion state of the target area or the state of the magnetic resonance system according to the monitoring signal;
the imaging signal acquisition module is used for exciting a target area of a target object by using an imaging sequence to acquire an imaging signal under the condition that the motion state of the target area or the state of the magnetic resonance system meets a set condition;
and the spectrum image acquisition module is used for acquiring a spectrum image of the target area according to the imaging signal.
In a fifth aspect, an embodiment of the present invention further provides an apparatus, where the apparatus includes:
one or more processors;
a memory for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the method for adjusting a magnetic resonance spectroscopy scan according to any of the embodiments of the present invention and/or the method for scanning a magnetic resonance system spectroscopy according to any of the embodiments of the present invention.
In a sixth aspect, embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the magnetic resonance spectroscopy scan adjusting method and/or the magnetic resonance system spectroscopy scan adjusting method according to any of the embodiments of the present invention.
According to the technical scheme of the embodiment, the water signal of the target area of the target object is acquired at the target acquisition moment, the water signal is subjected to feature extraction to obtain the spectral characteristics of the water signal, the scanning parameters of the magnetic resonance spectrum scanning are adjusted according to at least one spectral characteristic, and the scanning strategy can be determined according to the state of the magnetic resonance system. The technical scheme of the embodiment of the invention solves the problems that the magnetic resonance spectrum can only be observed by observing the spectrum result, if the imaging quality is poor, the magnetic resonance spectrum needs to be scanned again, and a large amount of time and cost are wasted, realizes that the scanning parameters of the magnetic resonance spectrum scanning are adjusted by detecting the spectrum characteristic of the water signal of the target object, not only can the accuracy of the scanning data be ensured, but also the scanning time and the cost can be saved.
Drawings
Fig. 1a is a flowchart of a magnetic resonance spectroscopy scan adjustment method according to an embodiment of the present invention;
fig. 1b is an exemplary diagram of a target collection time provided in the first embodiment of the present invention;
FIG. 1c is an exemplary diagram of an exemplary timing sequence for center frequency field detection provided in the first embodiment of the present invention;
FIG. 1d is a spectrum diagram of a center frequency before being corrected according to a first embodiment of the present invention;
fig. 1e is a spectrum diagram after center frequency correction according to a first embodiment of the present invention;
FIG. 1f is a diagram illustrating an exemplary timing sequence for scanning motion detection according to a first embodiment of the present invention;
fig. 1g to fig. 1h are brain images provided in the first embodiment of the present invention.
Fig. 1i is a schematic diagram illustrating an effect of a motion on an image according to a first embodiment of the present invention.
Fig. 2 is a flowchart of a magnetic resonance spectroscopy scan adjustment method according to a second embodiment of the present invention;
fig. 3 is a flowchart of a method for scanning a magnetic resonance system spectrum according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a magnetic resonance spectroscopy scanning and adjusting apparatus provided in the fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a spectrum scanning apparatus of a magnetic resonance system according to a fifth embodiment of the present invention;
fig. 6 is a schematic structural diagram of an apparatus provided in the sixth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Example one
Fig. 1a is a flowchart of a magnetic resonance spectroscopy scan adjustment method according to an embodiment of the present invention, which is applicable to a scan adjustment of a medical imaging apparatus, and is particularly applicable to a magnetic resonance spectroscopy scan adjustment. The method may be performed by a magnetic resonance spectroscopy scan adjustment apparatus, which may be implemented by hardware and/or software, and which may be integrated into a device (e.g., a computer) to perform, and specifically includes the following steps:
Wherein the target acquisition instants comprise at least one preset instant before and/or during the start of a magnetic resonance spectroscopy scan.
The target acquisition instants may be either before the start of the magnetic resonance spectroscopy scan or interspersed during the magnetic resonance spectroscopy scan.
The target region may comprise certain parts of the target object, such as the brain, etc.
The target object refers to a subject, and may include a scientific research staff, a patient, and the like.
For example, as shown in FIG. 1B, which is an exemplary diagram of target acquisition time, block B represents an imaging block, which includes a water-suppressing and imaging sequence excitation portion, which may include a single-voxel imaging sequence and a multi-voxel imaging sequence, such as a spin-echo single voxel (svs _ press), a stimulus-echo single voxel (svs _ steam), a multi-voxel spin-echo (csi _ press), a multi-voxel stimulus echo (csi _ steam), and so on. The imaging module can be provided with a monitoring module A after repeatedly acquiring data for N times, and in the acquisition of the imaging module, the embodiment of the invention can insert central frequency field detection or motion detection, namely the module A (monitoring module) in the figure. To save time, the monitoring module may be added after each imaging acquisition. The module A can utilize a monitoring sequence to excite a target area of a target object so as to acquire a monitoring signal; and determining the motion state of the target area or the state of the magnetic resonance system according to the monitoring signal.
The preset time can be that the module A is loaded once for detection before the module B collects once, twice or more.
And 102, extracting the characteristics of the water signal to obtain the spectral characteristics of the water signal.
Wherein the spectral characteristics include at least one of water signal chemical shift, half-peak height-width, and curve symmetry.
The spectral characteristics of the water signals are obtained by performing feature extraction (such as Fourier transform and the like) on the collected water signals, when the half-peak height and width corresponding to the water signals are wide (wherein, the half-peak height and width corresponding to the water signals are judged to be wide and determined by a threshold set by experiments, and if the half-peak height and width corresponding to the water signals are over the set threshold, the half-peak height and width corresponding to the water signals are judged to be wide), and the frequency domain symmetry corresponding to the water signals is poor (wherein, the curve symmetry of the water signals is judged to be determined by the threshold set by the experiments), the central frequency field difference is indicated, an operator can be inquired whether to stop scanning at this time through a preset interactive interface, and a target object is prompted and an interested area is moved because the collected data.
An example timing sequence for center frequency field detection is shown in FIG. 1 c: the scheme of quickly acquiring the central frequency and the half-peak height width of a water signal by exciting at a small angle (flip angle) and short repetition Time (TR). The flip angle of the Radio Frequency (RF) pulse in the figure is an example of one implementation and may be other pulsed signals. Gx, Gy, Gz represent gradients along three orthogonal directions of the X-axis, Y-axis and Z-axis, respectively; ADC isAn analog-to-digital conversion signal acquisition window; RF is a transmission of radio frequency pulses,
and
the center frequency can be determined by the ADC for the flip angles applied at different times.
Optionally, the adjusting of the scan parameters of the magnetic resonance spectroscopy scan according to at least one of the spectral characteristics comprises:
if the chemical shift of the water signal is larger than a preset shift threshold, re-determining a target scanning parameter corresponding to the target acquisition moment, wherein the preset shift threshold is set according to experience;
and scanning the target object according to the target scanning parameters so as to update scanning data corresponding to the target scanning time.
If the chemical shift of the water signal is larger than a preset shift threshold value, supposing that the chemical shift of the water signal caused by the movement of the target object is larger, the corresponding scanning data cannot be used, and the scanning data needs to be acquired again.
Optionally, before the re-determining the target scan parameter corresponding to the target acquisition time, the method further includes:
adjusting shim parameters of the magnetic resonance system, wherein the adjusting comprises restarting; and/or performing scanning posture reminding on the target object.
Before the re-determining the target scan parameter corresponding to the target acquisition time, at least one of adjusting shim parameters of the magnetic resonance system and performing scan posture reminding on the target object may be included.
The scanning posture reminding is to remind the target object to adjust the scanning posture, and can be in various forms such as voice prompt and the like.
Shimming parameters of the magnetic resonance system may be adjusted, e.g. shimming is restarted, before said re-determining target scan parameters corresponding to the target acquisition instants.
Before the target scanning parameters corresponding to the target acquisition time are determined again, scanning posture reminding can be performed on the target object.
Wherein the user comprises an operator of the magnetic resonance system.
Optionally, the adjusting of the scan parameters of the magnetic resonance spectroscopy scan according to at least one of the spectral characteristics comprises:
and if the half-peak height and width is not in a preset height and width range and/or the curve symmetry does not meet a preset symmetry condition, generating prompt information, wherein the prompt information is used for prompting a target object to adjust the position of the region of interest and/or prompting a user whether to stop the scanning.
Wherein, if the half-peak height width is not in the preset height width range, the half-peak height width is too wide.
The curve symmetry not meeting the preset symmetry condition means that the curve symmetry is poor.
The condition that the half peak height width is too wide and the curve symmetry is poor meets at least one of the two conditions, the central frequency field quality of the target area is poor, and the target object can be prompted to move the position of the region of interest.
The condition that the half peak height width is too wide and the curve symmetry is poor meets at least one of the two conditions indicates that the central frequency field quality of the target area is poor, and a user can be prompted whether to stop the scanning.
The condition that the half peak height width is too wide and the curve symmetry is poor meets at least one of the two conditions indicates that the central frequency field quality of the target area is poor, so that a user can be prompted whether to stop the scanning and the target object can be prompted to move the position of the region of interest.
Optionally, the adjusting of the scan parameters of the magnetic resonance spectroscopy scan according to at least one of the spectral characteristics comprises:
and if the chemical shift of the water signal, the height and width of the half peak and the symmetry of the curve all meet preset conditions, acquiring the shift deviation of the chemical shift of the water signal, and correcting the frequency deviation of the scanning data of the magnetic resonance spectrum scanning according to the shift deviation.
If the chemical shift of the water signal, the half-peak height width and the curve symmetry all meet preset conditions, the chemical shift of the water signal is within a preset threshold range, the half-peak height width is proper, and the curve symmetry is reasonable.
The frequency shift correction method refers to a method in which the frequency of the spectral data can be corrected according to the chemical shift of the water signal.
For example, the center frequency of the first acquired water signal may be used as a reference, and if the center frequency of the later acquired water signal deviates from the reference, the deviation is added to the reference, so as to realize the frequency offset correction.
For example, 100 times of measurement are required in a scanning plan, when the displacement variation of the water signal is found to exceed the preset threshold value through the detection of the central frequency field, it is presumed that the displacement deviation of the water signal caused by the motion is large, for example, 20 times of previous acquisition are performed, and the data currently acquired cannot be used due to the influence of the motion, and the data needs to be acquired again.
Ideally, for the proton core, the 3T system center frequency corresponds to approximately 128MHZ, and the 1.5T system corresponds to approximately 64 MHZ.
Fig. 1d is a spectrum before the center frequency correction, and fig. 1e is a spectrum after the center frequency correction. If the center frequency correction is not carried out (fig. 1d), if 128 times of acquisition is carried out on a certain area, the acquired data are subjected to superposition average summation, and before the correction, because the center frequency of the data acquired each time is deviated, 1.3ppm lactic acid double peaks are overlapped and cannot be completely separated, the image resolution is lower; after correction (shown in fig. 1 e), the lactic acid peaks are clearly separated, and the FWHM of the NAA, Cr, etc. peak heights at half maximum is also narrowed, indicating that the resolution of the captured images of the embodiment of the present invention is significantly improved.
Further, scan parameters of the magnetic resonance spectroscopy scan may be adjusted according to a motion state of a target region of a target object, including: when the motion of the scanned person is monitored, the program automatically starts a voice prompt to prompt the person to be tested to concentrate on the attention coordination and stay still. Meanwhile, the motion amplitude is judged, if the result feedback motion amplitude is smaller, K space data near the corresponding moment can be rejected, and the rejected data are collected again; if the motion amplitude is larger, prompting to suggest a user (such as an operator) to stop the scanning and restart the scanning.
An example of a scanning motion detection timing is shown in fig. 1 f.
The fast 2D excitation acquires small area localized projections for motion detection by exciting at a small angle (RF in the figure). Here, RF is not limited to the 2D excitation K-space mode in the figure. Motion detection is performed by the ADC.
For example, motion detection may be utilized for navigation.
In fig. 1 g-1 h the scanning site is the head and a position is selected as a navigation bar in the head region, by projecting in one direction, wherein the cylinder is the navigation bar. When the position of the navigation bar is fixed, the measured image correspondence changes with the time shift. If the projection is carried out, under the condition that the navigation bar is not changed, a straight line is projected when the navigation bar is static, and under the condition that the motion is changed, the projected line slightly fluctuates.
Figure 1i shows the effect of motion on the image. The upper half of the image is the acquired white matter image, and the lower half of the curve represents the projection of the white image. The arrows indicate the motion of the corresponding scanned subject head. The area selected by the rectangular frame corresponds to the object without movement; when violent movement occurs, the amplitude of the projection line shakes more obviously; when slight movement as shown by the arrow occurs, the target object can be voice-prompted to remain quiet; when the violent movement occurs and exceeds a certain threshold value, stopping the scanning and starting a new scanning.
According to the technical scheme of the embodiment, the water signal of the target area of the target object is acquired at the target acquisition moment, the water signal is subjected to feature extraction to obtain the spectral characteristics of the water signal, the scanning parameters of the magnetic resonance spectrum scanning are adjusted according to at least one spectral characteristic, and the scanning strategy can be determined according to the state of the magnetic resonance system. The technical scheme of the embodiment of the invention solves the problems that the magnetic resonance spectrum can only be observed by observing the spectrum result, if the imaging quality is poor, the magnetic resonance spectrum needs to be scanned again, and a large amount of time and cost are wasted, realizes that the scanning parameters of the magnetic resonance spectrum scanning are adjusted by detecting the spectrum characteristic of the water signal of the target object, not only can the accuracy of the scanning data be ensured, but also the scanning time and the cost can be saved.
Example two
Fig. 2 is a flowchart of a magnetic resonance system spectrum scanning method according to a second embodiment of the present invention, and this embodiment, on the basis of the foregoing embodiment, optionally adjusts the scanning parameters of the magnetic resonance spectrum scanning according to at least one of the spectrum characteristics, and includes: if the chemical shift of the water signal is larger than a preset shift threshold, re-determining a target scanning parameter corresponding to the target acquisition moment; and scanning the target object according to the target scanning parameters so as to update scanning data corresponding to the target scanning time.
On this basis, further, before the acquiring the target scan parameter corresponding to the target acquisition time, the method includes: adjusting shim parameters of the magnetic resonance system, wherein the adjusting comprises restarting.
On this basis, further, before the acquiring the target scan parameter corresponding to the target acquisition time, the method includes: and carrying out scanning posture reminding on the target object.
On this basis, further, the adjusting of the scan parameters of the magnetic resonance spectroscopy scan according to at least one of the spectral characteristics comprises: and if the half-peak height and width are not in the preset height and width range and/or the curve symmetry does not meet the preset symmetry condition, generating user prompt information, wherein the prompt information is used for prompting a user whether to stop the scanning.
On this basis, further, the adjusting of the scan parameters of the magnetic resonance spectroscopy scan according to at least one of the spectral characteristics comprises: and if the half-peak height and width are not in a preset height and width range and/or the curve symmetry does not meet a preset symmetry condition, generating scanning prompt information, wherein the prompt information is used for prompting a target object to adjust the position of the region of interest.
On this basis, further, the adjusting of the scan parameters of the magnetic resonance spectroscopy scan according to at least one of the spectral characteristics comprises: and if the chemical shift of the water signal, the height and width of the half peak and the symmetry of the curve all meet preset conditions, acquiring the shift deviation of the chemical shift of the water signal, and correcting the frequency deviation of the scanning data of the magnetic resonance spectrum scanning according to the shift deviation.
As shown in fig. 2, the method specifically comprises the following steps:
Wherein the target acquisition instants comprise at least one preset instant before and/or during the start of a magnetic resonance spectroscopy scan.
Wherein the spectral characteristics include at least one of water signal chemical shift, half-peak height-width, and curve symmetry.
And 204, if the half peak height and width are not in the preset height and width range and/or the curve symmetry does not meet the preset symmetry condition, generating prompt information.
And the prompt information is used for prompting the target object to adjust the position of the region of interest and/or prompting the user whether to stop the scanning.
The preset height-width range means that the half-peak height width is too wide.
The preset symmetry condition means that the symmetry is poor.
Optionally, if the half-peak height and width is not within a preset height and width range and/or the curve symmetry does not satisfy a preset symmetry condition, generating prompt information, where the prompt information is used to prompt a target object to adjust a position of an area of interest; or to prompt the user whether to stop the present scan.
And step 205, if the chemical shift of the water signal, the height and width of the half peak and the symmetry of the curve all meet preset conditions, acquiring a shift deviation of the chemical shift of the water signal, and correcting the frequency deviation of the scanning data of the magnetic resonance spectrum scanning according to the shift deviation.
If the chemical shift of the water signal, the half-peak height and the curve symmetry all meet the preset conditions, the chemical shift deviation of the water signal is small (meets the preset threshold value and slightly changes), the half-peak height and the width meet the preset threshold value, and the curve symmetry is acceptable (meets the corresponding preset threshold value).
In the present embodiment, the steps are numbered only for the sake of clarity in explanation of the technical features, and the execution order is not strictly limited. For example, in this embodiment, the order of step 203, step 204, and step 205 is not limited, and step 203, step 204, and step 205 may be executed in parallel or in series.
According to the technical scheme of the embodiment of the invention, if the chemical shift of the water signal is greater than a preset shift threshold, the target scanning parameter corresponding to the target acquisition moment is determined again; and scanning the target object according to the target scanning parameters to update the scanning data corresponding to the target scanning moment, so that the quality of the scanning data is determined by detecting the state of the magnetic resonance system, and the scanning time and the scanning cost can be saved. Furthermore, the purpose of adjusting scanning is achieved by generating user prompt information, generating scanning prompt information, performing scanning posture reminding on the target object and the like. And then, if the chemical shift of the water signal, the height and width of the half peak and the symmetry of the curve all meet preset conditions, acquiring the shift deviation of the chemical shift of the water signal, and correcting the frequency deviation of the scanning data of the magnetic resonance spectrum scanning according to the shift deviation, thereby realizing the function of improving the resolution of the spectrum image.
EXAMPLE III
Fig. 3 is a flowchart of a magnetic resonance system spectrum scanning method according to a third embodiment of the present invention, which is applicable to a magnetic resonance system spectrum scanning situation, and the method can be executed by a magnetic resonance system spectrum scanning apparatus, and the apparatus can be implemented by software and/or hardware. The magnetic resonance system comprises a monitoring module and an imaging module, wherein the monitoring module is provided with a monitoring sequence, and the imaging module is provided with an imaging sequence. Referring to fig. 3, a method for scanning a spectrum of a magnetic resonance system according to an embodiment of the present invention includes the following steps:
it should be noted that the third embodiment of the present invention provides a method for magnetic resonance system spectrum scanning, which is to use the methods in the first and second embodiments in a magnetic resonance system spectrum scanning process to adjust a relevant scanning workflow of the magnetic resonance system spectrum scanning.
The monitoring signal may include a water signal, a motion signal, and the like.
And 303, exciting the target area of the target object by using the imaging sequence to acquire an imaging signal under the condition that the motion state of the target area or the state of the magnetic resonance system meets a set condition.
The method in steps 302-303 is to use the scan adjustment method of the first embodiment and the scan adjustment method of the second embodiment in the third embodiment.
Wherein the state of the magnetic resonance system comprises the state of the central frequency field and the like (the state of the magnetic resonance system is determined by the water signal chemical shift, the half-peak height width, the curve symmetry and the like of the measured water signal).
The motion state can also be determined by the first embodiment and the second embodiment.
The setting conditions include the determination of the state of the central frequency field and the determination of whether the motion state of the target region satisfies the empirical value determined by experiments as described in the first and second embodiments.
And 304, acquiring a spectrum image of the target area according to the imaging signal.
The technical scheme of the embodiment of the invention utilizes the monitoring sequence to excite the target area of the target object so as to obtain the monitoring signal; determining the motion state of the target area or the state of the magnetic resonance system according to the monitoring signal; under the condition that the motion state of the target area or the state of the magnetic resonance system meets a set condition, exciting the target area of the target object by using an imaging sequence to acquire an imaging signal; and acquiring a spectrum image of the target area according to the imaging signal. The technical scheme of the embodiment of the invention solves the problems that the magnetic resonance spectrum can only be observed when in magnetic resonance spectrum, if the imaging quality is poor, the magnetic resonance spectrum needs to be scanned again, and a large amount of time and cost are wasted, realizes the adjustment scanning by detecting the motion state of a target area or the state of a magnetic resonance system, and can save the scanning time and cost.
Example four
Fig. 4 is a schematic structural diagram of a magnetic resonance spectroscopy scanning and adjusting apparatus provided in the fourth embodiment of the present invention. The magnetic resonance spectrum scanning adjusting device provided by the embodiment of the invention can execute the magnetic resonance spectrum scanning adjusting method provided by any embodiment of the invention, and the device has the following specific structure: a signal acquisition module 41, a water signal processing module 42 and a scanning parameter adjusting module 43.
The signal acquisition module 41 is configured to acquire a water signal of a target region of a target object at a target acquisition time, where the target acquisition time includes at least one preset time before starting a magnetic resonance spectrum scan and/or during the magnetic resonance spectrum scan;
the water signal processing module 42 is configured to perform feature extraction on the water signal to obtain a spectral characteristic of the water signal, where the spectral characteristic includes at least one of a water signal chemical shift, a half-peak height and width, and a curve symmetry;
a scan parameter adjustment module 43 for adjusting scan parameters of the magnetic resonance spectroscopy scan in accordance with at least one of the spectral characteristics.
According to the technical scheme of the embodiment, the water signal of the target area of the target object is acquired at the target acquisition moment, the water signal is subjected to feature extraction to obtain the spectral characteristics of the water signal, the scanning parameters of the magnetic resonance spectrum scanning are adjusted according to at least one spectral characteristic, and the scanning strategy can be determined according to the state of the magnetic resonance system. The technical scheme of the embodiment of the invention solves the problems that the magnetic resonance spectrum can only be observed by observing the spectrum result, if the imaging quality is poor, the magnetic resonance spectrum needs to be scanned again, and a large amount of time and cost are wasted, realizes that the scanning parameters of the magnetic resonance spectrum scanning are adjusted by detecting the spectrum characteristic of the water signal of the target object, not only can the accuracy of the scanning data be ensured, but also the scanning time and the cost can be saved.
On the basis of the above technical solution, the scan parameter adjusting module 43 may be specifically configured to:
if the chemical shift of the water signal is larger than a preset shift threshold, re-determining a target scanning parameter corresponding to the target acquisition moment;
and scanning the target object according to the target scanning parameters so as to update scanning data corresponding to the target scanning time.
On the basis of the above technical solution, the magnetic resonance spectrum scanning adjustment apparatus further includes: and an adjusting module.
An adjusting module, configured to adjust shimming parameters of the magnetic resonance system before the target scan parameter corresponding to the target acquisition time is determined again, where the adjusting includes restarting; and/or performing scanning posture reminding on the target object.
On the basis of the above technical solution, the scan parameter adjusting module 43 may be specifically configured to:
and if the half-peak height and width is not in a preset height and width range and/or the curve symmetry does not meet a preset symmetry condition, generating prompt information, wherein the prompt information is used for prompting a target object to adjust the position of the region of interest and/or prompting a user whether to stop the scanning. On the basis of the above technical solution, the scan parameter adjusting module 43 may be specifically configured to:
and if the chemical shift of the water signal, the height and width of the half peak and the symmetry of the curve all meet preset conditions, acquiring the shift deviation of the chemical shift of the water signal, and correcting the frequency deviation of the scanning data of the magnetic resonance spectrum scanning according to the shift deviation.
The magnetic resonance spectrum scanning adjusting device provided by the embodiment of the invention can execute the magnetic resonance spectrum scanning adjusting method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the executing method.
EXAMPLE five
Fig. 5 is a schematic structural diagram of a magnetic resonance system spectrum scanning apparatus provided in the fifth embodiment of the present invention. The magnetic resonance system spectrum scanning device provided by the embodiment of the invention can execute the magnetic resonance system spectrum scanning method provided by any embodiment of the invention, and the specific structure of the device is as follows: a monitor signal acquisition module 51, a state determination module 52, an imaging signal acquisition module 53, and a spectral image acquisition module 54. The magnetic resonance system comprises a monitoring module and an imaging module, wherein the monitoring module is provided with a monitoring sequence, and the imaging module is provided with an imaging sequence.
A monitoring signal obtaining module 51, configured to excite a target region of a target object with a monitoring sequence to obtain a monitoring signal;
a state determination module 52, configured to determine a motion state of the target region or a state of the magnetic resonance system according to the monitoring signal;
an imaging signal acquiring module 53, configured to excite a target region of a target object with an imaging sequence to acquire an imaging signal when a motion state of the target region or a state of a magnetic resonance system satisfies a set condition;
and a spectrum image obtaining module 54 for obtaining a spectrum image of the target area according to the imaging signal.
The technical scheme of the embodiment of the invention utilizes the monitoring sequence to excite the target area of the target object so as to obtain the monitoring signal; determining the motion state of the target area or the state of the magnetic resonance system according to the monitoring signal; under the condition that the motion state of the target area or the state of the magnetic resonance system meets a set condition, exciting the target area of the target object by using an imaging sequence to acquire an imaging signal; and acquiring a spectrum image of the target area according to the imaging signal. The technical scheme of the embodiment of the invention solves the problems that the magnetic resonance spectrum can only be observed when in magnetic resonance spectrum, if the imaging quality is poor, the magnetic resonance spectrum needs to be scanned again, and a large amount of time and cost are wasted, realizes the adjustment scanning by detecting the motion state of a target area or the state of a magnetic resonance system, and can save the scanning time and cost.
The magnetic resonance system spectrum scanning device provided by the embodiment of the invention can execute the magnetic resonance system spectrum scanning method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE six
Fig. 6 is a schematic structural diagram of an apparatus according to a sixth embodiment of the present invention, as shown in fig. 6, the apparatus includes a processor 60, a memory 61, an input device 62, and an output device 63; the number of processors 60 in the device may be one or more, and one processor 60 is taken as an example in fig. 6; the processor 60, the memory 61, the input device 62 and the output device 63 in the apparatus may be connected by a bus or other means, as exemplified by the bus connection in fig. 6.
The memory 61 is a computer readable storage medium, and can be used for storing software programs, computer executable programs, and modules, such as program instructions/modules corresponding to the magnetic resonance spectrum scanning adjustment method and/or the magnetic resonance system spectrum scanning method in the embodiment of the present invention (for example, the signal acquisition module 41, the water signal processing module 42, and the scanning parameter adjustment module 43 in the magnetic resonance spectrum scanning adjustment device, and/or the monitoring signal acquisition module 51, the state determination module 52, the imaging signal acquisition module 53, and the spectrum image acquisition module 54 in the magnetic resonance system spectrum scanning device). The processor 60 executes software programs, instructions and modules stored in the memory 61 to perform various functional applications of the apparatus and data processing, i.e. to implement the above-mentioned magnetic resonance spectroscopy adjustment method and/or the magnetic resonance system spectroscopy method.
The memory 61 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 61 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 61 may further include memory located remotely from the processor 60, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 62 is operable to receive input scan signals and to generate signal inputs relating to user settings and function control of the apparatus. The output device 63 may include a display device such as a display screen.
EXAMPLE seven
An embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, perform a method of magnetic resonance spectroscopy scan adjustment, the method comprising:
acquiring a water signal of a target area of a target object at a target acquisition time, wherein the target acquisition time comprises at least one preset time before starting and/or during a magnetic resonance spectroscopy scan;
performing feature extraction on the water signal to obtain a spectral characteristic of the water signal, wherein the spectral characteristic comprises at least one of water signal chemical shift, half-peak height and width and curve symmetry;
adjusting scan parameters of the magnetic resonance spectroscopy scan based on at least one of the spectral characteristics. Of course, embodiments of the present invention provide a storage medium containing computer-executable instructions that are not limited to the method operations described above, but may also perform operations related to the adjustment of a magnetic resonance spectroscopy scan provided by any of the embodiments of the present invention.
There is also provided, as an alternative to an embodiment of the present invention, a storage medium containing computer-executable instructions which, when executed by a computer processor, perform a method of magnetic resonance system spectroscopy, the magnetic resonance system including a monitoring module and an imaging module, the monitoring module setting a monitoring sequence and the imaging module setting an imaging sequence, the method including:
exciting a target area of a target object by using a monitoring sequence to obtain a monitoring signal;
determining the motion state of the target area or the state of the magnetic resonance system according to the monitoring signal;
under the condition that the motion state of the target area or the state of the magnetic resonance system meets a set condition, exciting the target area of the target object by using an imaging sequence to acquire an imaging signal;
and acquiring a spectrum image of the target area according to the imaging signal.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the apparatus, the included units and modules are merely divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. A method of adjusting a magnetic resonance spectroscopy scan, comprising:
acquiring a water signal of a target area of a target object at a target acquisition time, wherein the target acquisition time comprises at least one preset time before starting and/or during a magnetic resonance spectroscopy scan;
performing feature extraction on the water signal to obtain a spectral characteristic of the water signal, wherein the spectral characteristic comprises at least one of water signal chemical shift, half-peak height and width and curve symmetry;
adjusting scan parameters of the magnetic resonance spectroscopy scan according to at least one of the spectral characteristics, wherein the adjusting scan parameters of the magnetic resonance spectroscopy scan according to at least one of the spectral characteristics comprises:
if the chemical shift of the water signal is larger than a preset shift threshold, re-determining a target scanning parameter corresponding to the target acquisition moment; scanning the target object according to the target scanning parameters to update scanning data corresponding to the target scanning time;
if the half-peak height and width is not in a preset height and width range and/or the curve symmetry does not meet a preset symmetry condition, generating prompt information, wherein the prompt information is used for prompting a target object to adjust the position of the region of interest and/or prompting a user whether to stop the scanning;
and if the chemical shift of the water signal, the height and width of the half peak and the symmetry of the curve all meet preset conditions, acquiring the shift deviation of the chemical shift of the water signal, and correcting the frequency deviation of the scanning data of the magnetic resonance spectrum scanning according to the shift deviation.
2. The method of claim 1, further comprising, prior to said re-determining target scan parameters corresponding to said target acquisition time:
adjusting shim parameters of the magnetic resonance system, wherein the adjusting comprises restarting; and/or performing scanning posture reminding on the target object.
3. A magnetic resonance system spectroscopy method, the magnetic resonance system comprising a monitoring module and an imaging module, the monitoring module setting a monitoring sequence and the imaging module setting an imaging sequence, the method comprising:
exciting a target area of a target object by using a monitoring sequence to obtain a monitoring signal, wherein the monitoring signal comprises a water signal;
determining the motion state of the target area or the state of the magnetic resonance system according to the monitoring signal;
under the condition that the motion state of the target area or the state of the magnetic resonance system meets a set condition, exciting the target area of the target object by using an imaging sequence to acquire an imaging signal;
acquiring a spectrum image of the target area according to the imaging signal;
the motion state at least comprises a static state, a violent motion state and a slight motion state, the state of the magnetic resonance system is determined by the spectral characteristics of the water signals, the spectral characteristics comprise water signal chemical shift, half-peak height and width and curve symmetry, and the set conditions comprise the judgment of the state of the central frequency field and the judgment of whether the motion state of the target area meets the empirical value determined by experiments.
4. A magnetic resonance spectroscopy scan adjustment apparatus, comprising:
a signal acquisition module for acquiring a water signal of a target region of a target object at a target acquisition time, wherein the target acquisition time comprises at least one preset time before starting a magnetic resonance spectrum scan and/or during the magnetic resonance spectrum scan;
the water signal processing module is used for extracting the characteristics of the water signal to obtain the spectral characteristics of the water signal, wherein the spectral characteristics comprise at least one of water signal chemical shift, half-peak height and width and curve symmetry;
a scan parameter adjustment module for adjusting scan parameters of the magnetic resonance spectroscopy scan according to at least one of the spectral characteristics, wherein the adjusting scan parameters of the magnetic resonance spectroscopy scan according to at least one of the spectral characteristics comprises:
if the chemical shift of the water signal is larger than a preset shift threshold, re-determining a target scanning parameter corresponding to the target acquisition moment; scanning the target object according to the target scanning parameters to update scanning data corresponding to the target scanning time;
if the half-peak height and width is not in a preset height and width range and/or the curve symmetry does not meet a preset symmetry condition, generating prompt information, wherein the prompt information is used for prompting a target object to adjust the position of the region of interest and/or prompting a user whether to stop the scanning;
and if the chemical shift of the water signal, the height and width of the half peak and the symmetry of the curve all meet preset conditions, acquiring the shift deviation of the chemical shift of the water signal, and correcting the frequency deviation of the scanning data of the magnetic resonance spectrum scanning according to the shift deviation.
5. A magnetic resonance system spectroscopy apparatus, the magnetic resonance system including a monitoring module and an imaging module, the monitoring module setting a monitoring sequence and the imaging module setting an imaging sequence, the magnetic resonance system spectroscopy apparatus comprising:
the monitoring signal acquisition module is used for exciting a target area of a target object by using a monitoring sequence to acquire monitoring signals, wherein the monitoring signals comprise water signals;
the state determination module is used for determining the motion state of the target area or the state of the magnetic resonance system according to the monitoring signal;
the imaging signal acquisition module is used for exciting a target area of a target object by using an imaging sequence to acquire an imaging signal under the condition that the motion state of the target area or the state of the magnetic resonance system meets a set condition;
the spectrum image acquisition module is used for acquiring a spectrum image of the target area according to the imaging signal;
the motion state at least comprises a static state, a violent motion state and a slight motion state, the spectral characteristics of the water signals in the state of the magnetic resonance system are determined, the spectral characteristics comprise water signal chemical shift, half-peak height and width and curve symmetry determination, and the set conditions comprise the judgment of the state of the central frequency field and the judgment of whether the motion state of the target area meets the empirical value determined by experiments.
6. An apparatus, comprising:
one or more processors;
a memory for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the magnetic resonance spectroscopy scan adjustment method of any one of claims 1-2 and/or the magnetic resonance system spectroscopy scan method of claim 3.
7. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the magnetic resonance spectroscopy scan adjustment method of any one of claims 1-2 and/or the magnetic resonance system spectroscopy scan method of claim 3.
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