CN116819412B - Correction method and device for magnetic resonance system and magnetic resonance system - Google Patents
Correction method and device for magnetic resonance system and magnetic resonance system Download PDFInfo
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Abstract
The application relates to the technical field of magnetic resonance imaging, and provides a correction method and device of a magnetic resonance system and the magnetic resonance system, wherein an object to be detected and at least one correction die body are placed in a scanning cavity of the magnetic resonance system, the magnetic resonance system is provided with a first scanning sequence, and the method comprises the following steps: adopting the first scanning sequence to rotationally acquire K space signals of the correction die body; acquiring the offset of the magnetic resonance system based on the K space signal; correcting the first scanning sequence according to the offset to obtain a second scanning sequence; and obtaining the scanning data of the object to be detected based on the second scanning sequence. Compared with the prior art, the technical scheme of the application not only can realize real-time correction of the position offset of the K space signal of the scanning sequence in the actual scanning process, but also can effectively ensure the data consistency and the data accuracy of the K space signal obtained through rotation acquisition.
Description
Technical Field
The present application relates to the field of magnetic resonance imaging technology, and in particular, to a method and an apparatus for correcting a magnetic resonance system, and a magnetic resonance system.
Background
Magnetic Resonance Imaging (MRI) is a non-invasive medical imaging technique that is widely used in the medical field for diagnosis and treatment of various diseases. Of course, magnetic resonance imaging is also widely used in preclinical studies, playing an important role in promoting the development of medicine and biology.
In a magnetic resonance system, in the process of acquiring K space signals through rotation acquisition, each time the signal acquisition angle rotates, the applied gradient corresponding to the signal acquisition angle changes, and then different degrees of gradient delay, eddy current and other influences are generated, and the influences can lead to the change of the K space signals of an acquisition sequence, so that the K space signals corresponding to each angle deviate relative to the K space center.
However, since the prior art does not implement real-time correction for the offset, the K-space signal acquired based on the prior art has a problem of low accuracy.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method and apparatus for correcting a magnetic resonance system, and a magnetic resonance system.
In a first aspect, the present application provides a method of calibrating a magnetic resonance system having an object to be measured and at least one calibration phantom disposed within a scan volume of the magnetic resonance system, the magnetic resonance system configured with a first scan sequence, the method comprising:
Adopting the first scanning sequence to rotationally acquire K space signals of the correction die body;
acquiring the offset of the magnetic resonance system based on the K space signal;
correcting the first scanning sequence according to the offset to obtain a second scanning sequence;
and obtaining the scanning data of the object to be detected based on the second scanning sequence.
In one embodiment, the K-space signal is acquired by performing a plurality of angular rotational acquisitions of the correction phantom; the acquiring the offset of the magnetic resonance system based on the K-space signal includes:
acquiring the position of the peak value of the K space signal acquired by each angle; and obtaining the offset of the position of the peak value relative to the center of the K space according to the position of the peak value.
In one embodiment, the correcting the first scan sequence according to the offset to obtain a second scan sequence includes:
determining a first gradient adjustment value corresponding to a read-out coding part of the first scanning sequence and a second gradient adjustment value corresponding to a phase coding part of the first scanning sequence based on the offset of the position of the peak value relative to the center of the K space; and correcting the first scanning sequence based on the first gradient adjustment value and the second gradient adjustment value to obtain the second scanning sequence.
In one embodiment, the correcting the first scan sequence based on the first gradient adjustment value and the second gradient adjustment value to obtain the second scan sequence includes:
based on the first gradient adjustment value and the second gradient adjustment value, correcting the first scanning sequence to obtain a corrected and adjusted first scanning sequence; acquiring a K space signal of the correction die body by adopting the corrected and adjusted first scanning sequence; and if the position of the peak value of the K space signal is smaller than a preset threshold value, determining the corrected and adjusted first scanning sequence as the second scanning sequence.
In one embodiment, the first scan sequence is an ARMS sequence; the acquiring the offset of the magnetic resonance system based on the K-space signal includes:
based on the K-space signal, an offset of the ARMS sequence on a readout encoding portion and an offset of the ARMS sequence on a phase encoding portion are obtained.
In one embodiment, the ARMS sequence is a magnetic resonance sequence that achieves motion artifact correction based on a propeller K-space filling method.
In a second aspect, the present application also provides a correction device for a magnetic resonance system, the correction device comprising:
at least one calibration phantom for placement with an object to be measured within a scan cavity of the magnetic resonance system;
the K space signal acquisition module is used for rotationally acquiring the K space signal of the correction die body by adopting a first scanning sequence configured by the magnetic resonance system;
the offset acquisition module is used for acquiring the offset of the magnetic resonance system based on the K space signal;
the second scanning sequence acquisition module is used for correcting the first scanning sequence according to the offset to obtain a second scanning sequence;
and the scanning data acquisition module is used for acquiring the scanning data of the object to be detected based on the second scanning sequence.
In a third aspect, the present application further provides a processing terminal. The computer device comprises a memory storing a computer program and a processor implementing the steps of the above method when the processor executes the computer program.
In a fourth aspect, the application also provides a magnetic resonance system, which comprises a scanning bed, a scanning device and the processing terminal; wherein:
The scanning bed is used for placing an object to be tested and at least one correction die body;
the scanning equipment is used for collecting and outputting the K space signal of the correction die body and the scanning data of the object to be detected; the scanning device is used for configuring a scanning sequence.
In a fifth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the above method.
In a sixth aspect, the application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of the above method.
The correction method and device of the magnetic resonance system and the magnetic resonance system are characterized in that firstly, an object to be detected and at least one correction die body are placed in a scanning cavity of the magnetic resonance system, a first scanning sequence is adopted, and K space signals of the correction die body are acquired in a rotating mode. Then, based on the K space signal of the correction die body, the offset of the magnetic resonance system is obtained. And then, according to the offset of the magnetic resonance system, performing correction processing on the first scanning sequence, and further obtaining a second scanning sequence for obtaining the scanning data of the object to be detected. Compared with the prior art, the technical scheme of the application not only can realize real-time correction of the position offset of the K space signal of the scanning sequence in the actual scanning process, but also can effectively ensure the data consistency and the data accuracy of the K space signal obtained through rotation acquisition.
In another aspect, in some embodiments of the present application, there is also provided a magnetic resonance imaging method, the method comprising:
a first scanning sequence is adopted, and K space signals of a correction die body are rotationally acquired;
acquiring the offset of a magnetic resonance system based on the K space signal;
obtaining scanning data of an object to be detected based on the first scanning sequence;
determining a plurality of image reconstruction parameters according to the offset;
and obtaining a reconstructed image of the object to be detected by adopting each image reconstruction parameter.
According to the magnetic resonance imaging method provided by the embodiment of the application, the scanning data of the object to be detected is obtained based on the first scanning sequence, a plurality of image reconstruction parameters are determined according to the offset, and the image reconstruction parameters are adopted to obtain the reconstructed image of the object to be detected, so that the imaging quality of the reconstructed image of the object to be detected is effectively ensured.
Drawings
FIG. 1 is a flow chart of a method of calibrating a magnetic resonance system according to one embodiment;
FIG. 2 is a schematic diagram of a specific flow chart for K-space signal acquisition by ARMS sequence provided in one embodiment;
FIG. 3 is a flow chart of a specific way of obtaining the offset of the K-space signal according to one embodiment;
FIG. 4 is a schematic diagram of a sequence waveform representation of acquiring a K-space signal at a signal acquisition angle, according to one embodiment;
FIG. 5 is a flow diagram of one embodiment of a method for acquiring a second scan sequence;
FIG. 6 is a flow chart of a specific manner of determining the corrected and adjusted first scan sequence as the second scan sequence according to one embodiment;
FIG. 7 is a schematic diagram of a specific operational flow for K-space signal acquisition that degrades an ARMS sequence to a radial acquisition sequence, provided in one embodiment;
FIG. 8 is a flow chart of a specific way of acquiring a reconstructed image of an object under test according to one embodiment;
figure 9 is a block diagram of a correction device for a magnetic resonance system provided in one embodiment;
fig. 10 is an internal structural diagram of a computer device provided in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
The correction method of the magnetic resonance system provided by the embodiment of the application can be applied to server execution. The data storage system can store data which the server needs to process; the data storage system can be integrated on a server, and can also be placed on a cloud or other network servers; the server may be implemented as a stand-alone server or as a server cluster composed of a plurality of servers.
In one embodiment, as shown in fig. 1, there is provided a method of calibrating a magnetic resonance system having a scan volume in which an object to be measured and at least one calibration phantom are placed, the magnetic resonance system being configured with a first scan sequence, comprising the steps of:
Step S110, a first scanning sequence is adopted, and K space signals of a correction module are acquired in a rotating mode.
In this step, the first scan sequence is assigned to a scan device of the magnetic resonance system; the scanning cavity is a scanning cavity which is formed by a magnetic resonance scanning bin in the magnetic resonance system and provided with an imaging Field of View (FOV), and the scanning equipment of the magnetic resonance system can realize the real-time acquisition of K space signals of the object to be detected and/or the correction die body by moving the object to be detected and the correction die body carried on the scanning bed into the imaging Field of the scanning cavity; the object to be tested is a target object which is placed on a scanning bed axially moving in a scanning cavity of the magnetic resonance system and provided with a scanning imaging requirement by using the magnetic resonance system, for example, a small animal or a biological die body provided with the scanning imaging requirement, etc.; the correction die body is arranged on a scanning bed which axially moves in a scanning cavity of the magnetic resonance system and can be used for collecting K space signals with less noise, and the K space signals obtained through the scanning correction die body can be used for realizing correction for the magnetic resonance system; the rotary acquisition is to acquire K space signal acquisition modes of a plurality of groups of K space signals along different angles of the K space by controlling the amplitude and time of a phase encoding gradient and a reading encoding gradient, wherein each angle corresponds to one group of K space signals; the K-space signal of the correction phantom is obtained by using the first scanning sequence configured in the scanning device of the magnetic resonance system and by the rotation acquisition mode.
Specifically, the specific placement number of the correction modules can be determined based on the volume of the object to be detected, when the volume of the object to be detected is small, a plurality of correction modules can be placed on a scanning bed of the magnetic resonance system (namely, a plurality of correction modules are placed in an area which is not occupied by the object to be detected on the scanning bed of the magnetic resonance system), or the object to be detected and the correction modules on the scanning bed of the magnetic resonance system are simultaneously placed in an effective imaging area of a scanning device of the magnetic resonance system, so that in the subsequent imaging scanning process, the scanning bed is not required to be moved, acquisition of K space signals of the correction modules can be realized only by adjusting an imaging field of view in a software interface, and then the magnetic resonance system is corrected (namely, correction is performed on a first scanning sequence configured in the magnetic resonance system) based on the acquired K space signals of the correction modules, and a scanning imaging process of the object to be detected is completed by using the corrected magnetic resonance system; because the object to be measured is not usually a stationary object and has a more complex tissue structure than the correction die body, noise and motion information of the object to be measured are often contained in the K space signal of the object to be measured acquired based on the scanning sequence.
In practical application, in the process of acquiring the K space signal by the ARMS, only one echo signal can be acquired at a time, and a plurality of echo signals can be acquired at a time; the specific expression form of the correction die body can be a water die body, a biological die body and the like; the specific implementation flow of the rotation acquisition K-space signal may be in a form as shown in fig. 2, where the arrow direction at each angle in fig. 2 is the readout axis (RO) direction at the current angle, and the perpendicular direction with respect to the arrow direction in fig. 2 is the phase encoding axis (PE) direction at the current angle.
Step S120, based on the K-space signal, acquires an offset of the magnetic resonance system.
In the step, the K space signal, that is, the K space signal of the correction phantom, refers to the K space signal of the correction phantom placed in the scanning cavity of the magnetic resonance system obtained by adopting a first scanning sequence configured in the scanning equipment of the magnetic resonance system through a rotation acquisition mode; the rotary acquisition is a K space signal acquisition mode for acquiring a plurality of groups of K space signals along different angles of the K space by controlling the amplitude and time of a phase encoding gradient and a readout gradient; the offset of the magnetic resonance system refers to the offset of the magnetic resonance system obtained based on the K space signal of the correction motif acquired by the first scanning sequence.
Specifically, the offset of the magnetic resonance system may be specifically expressed in that, in the process of rotationally acquiring the K-space signal, the angle on the readout encoding portion of the first scan sequence is changed due to the rotation of the signal acquisition angle each time, and the K-space signal is offset relative to the K-space center due to the corresponding delay of the applied gradient on the different acquisition angles of the first scan sequence, and at this time, the offset of the magnetic resonance system, which characterizes the state change condition of the scanning device of the magnetic resonance system when acquiring the K-space signal each time, can be determined by performing quantization calculation on the offset.
Step S130, correcting the first scanning sequence according to the offset to obtain a second scanning sequence.
In the step, the offset, namely the offset of the magnetic resonance system, refers to the offset of the magnetic resonance system obtained based on the K space signal of the correction die body acquired by the first scanning sequence; a first scan sequence, which is assigned to a scan device of the magnetic resonance system; the second scan sequence is obtained by performing correction processing on the first scan sequence in the scan device of the magnetic resonance system according to the offset of the magnetic resonance system, and then determining the second scan sequence based on the corrected first scan sequence.
Step S140, based on the second scanning sequence, obtaining the scanning data of the object to be detected.
In the step, the second scanning sequence is that the first scanning sequence in the scanning equipment of the magnetic resonance system is corrected according to the offset of the magnetic resonance system, and then the obtained second scanning sequence is determined based on the corrected first scanning sequence; the object to be detected is a target object which is placed on a scanning bed axially moving in a scanning cavity of the magnetic resonance system and has the requirement of scanning and imaging by using the magnetic resonance system; the scan data of the object to be measured refers to the scan data of the K-space signal obtained by rotationally acquiring the K-space signal of the object to be measured by adopting the second scan sequence, and the K-space signal can be used for generating the reconstructed image of the object to be measured.
The correction method of the magnetic resonance system comprises the steps of firstly, placing an object to be detected and at least one correction die body in a scanning cavity of the magnetic resonance system, and rotationally acquiring K space signals of the correction die body by adopting a first scanning sequence. Then, based on the K space signal of the correction die body, the offset of the magnetic resonance system is obtained. And then, according to the offset of the magnetic resonance system, performing correction processing on the first scanning sequence, and further obtaining a second scanning sequence for obtaining the scanning data of the object to be detected. Compared with the prior art, the technical scheme of the application not only can realize real-time correction of the position offset of the K space signal of the scanning sequence in the actual scanning process, but also can effectively ensure the data consistency and the data accuracy of the K space signal obtained through rotation acquisition.
For a specific mode of acquiring the offset of the K space signal, the K space signal is acquired by carrying out rotation acquisition of a plurality of angles on the correction die body; in one embodiment, as shown in fig. 3, the step S120 specifically includes:
step S310, the position of the peak value of the K space signal acquired by each angle is acquired.
In the step, each angle refers to each signal acquisition angle for acquiring K space signals through rotation acquisition in a magnetic resonance system; the K space signal, namely the K space signal of the correction die body, refers to the K space signal of the correction die body which is obtained by adopting a first scanning sequence configured in scanning equipment of the magnetic resonance system and through a rotary acquisition mode and placed in a scanning cavity of the magnetic resonance system; the rotary acquisition is a K space signal acquisition mode for acquiring a plurality of groups of K space signals along different angles of the K space by controlling the amplitude and time of a phase encoding gradient and a readout gradient; the correction die body is arranged on a scanning bed which moves axially in a scanning cavity of the magnetic resonance system and can be used for acquiring K space signals with less noise; the peak position of the K space signals acquired at each angle refers to the peak position of each acquired multiple groups of K space signals along different angles of the K space by controlling the amplitude and time of the phase encoding gradient and the readout gradient.
In practical application, the step S310 may be replaced by "obtain the peak position of the K-space signal acquired at each preset angle". Each preset angle refers to a part of signal acquisition angles which can be used for acquiring K space signals, the part of signal acquisition angles can be screened from all signal acquisition angles which can be used for acquiring K space signals, systematic deviation (namely, offset of the position of the peak value of the K space signal relative to the center of the K space) obtained by calculating the K space signals of the correction die body based on the part of signal acquisition angles can be used for calculating systematic deviation corresponding to the signal acquisition angles of other K space signals which are not actually acquired, and then correction processing is carried out on the first scanning sequence in the actual scanning process based on the systematic deviation.
Step S320, obtaining the offset of the peak position relative to the K space center according to the peak position.
In the step, the peak position, namely the peak position of the K space signals acquired at each angle, refers to the peak position corresponding to each acquired plurality of groups of K space signals along different angles of the K space by controlling the amplitude and time of the phase encoding gradient and the readout gradient; the offset of the peak position relative to the K space center refers to the offset of the peak position of the K space signal acquired at each angle relative to the K space center.
Specifically, according to the position of the peak value, the specific way of obtaining the offset of the position of the peak value relative to the center of the K space may be to calculate the position of the peak value of the K space signal acquired at each angle, and record and store each of the offset positions as the offset of the position of the peak value of the K space signal acquired at each angle relative to the center of the K space.
In practical application, assuming that the known first scan sequence is a gradient echo sequence, in the process of rotationally acquiring the K-space signal of the correction phantom, the sequence waveform expression form of the K-space signal of one echo acquired at a certain signal acquisition angle may be a form as shown in fig. 4. In fig. 4, RF represents radio frequency pulses, GZ represents a layer-selecting gradient axis, GX and GY are two gradient axes perpendicular to GZ, and in general, GX and GY are also perpendicular to each other, ADC represents a signal acquisition axis of analog-to-digital conversion, a Time interval between two radio frequency pulses, called Repetition Time (TR), corresponds to a signal acquisition angle, when one RF acts, a layer-selecting gradient (i.e., a trapezoid portion of GZ) needs to be turned on to ensure that the current RF resonates with a specific layer, so as to generate a magnetic resonance signal, when one RF acts, phase encoding is performed by changing respective gradient magnitudes of the GX axis and the GY axis, the two gradients at this Time are phase encoding gradients, and specific values of the phase encoding gradients are different in different TRs, at this Time, after the phase encoding is completed, the ADC needs to be turned on for K-space signal acquisition, and the GX axis and the GY axis need to be turned on simultaneously, so as to satisfy the following requirements for respective intensities:
Wherein,,represents the included angle between the current acquisition K space position and the horizontal direction, and +.>；/>And the gradient amplitude is represented, and the specific numerical value of the gradient amplitude has a correlation with the imaging visual field and the acquisition bandwidth.
Further, after the K-space signal acquisition is completed, the ADC needs to be turned off, and then gradients are continuously applied in the GX-axis direction, the GY-axis direction, and the GZ-axis direction to ensure that the current residual magnetic resonance signal is destroyed, and then the next RF is continuously applied to start the next K-space signal acquisition process.
According to the embodiment of the application, the position of the peak value of the K space signal acquired at each angle is acquired, the offset of the position of the peak value relative to the center of the K space is obtained according to the position of the peak value, and the data accuracy of the K space signal acquired through rotation is effectively ensured in a mode of correcting the parameters of the scanning sequence according to the offset.
For a specific manner of acquiring the second scan sequence, in one embodiment, as shown in fig. 5, the step S130 specifically includes:
step S510, determining a first gradient adjustment value corresponding to the readout encoding portion of the first scan sequence and a second gradient adjustment value corresponding to the phase encoding portion of the first scan sequence based on the offset of the peak position with respect to the K-space center.
In the step, the offset of the peak position relative to the K space center refers to the offset of the peak position of the K space signal acquired at each angle relative to the K space center; the peak position of the K space signals acquired at each angle is the peak position of each acquired multiple groups of K space signals along different angles of the K space by controlling the amplitude and time of the phase encoding gradient and the readout gradient; the first gradient adjustment value corresponding to the read-out coding part of the first scanning sequence refers to the first gradient adjustment value corresponding to the read-out coding part of the first scanning sequence under each angle, which is determined based on the offset of the position of the peak value of the K space signal acquired under each angle relative to the center of the K space; the second gradient adjustment value corresponding to the phase coding part of the first scanning sequence refers to the second gradient adjustment value corresponding to the phase coding part of the first scanning sequence under each angle, which is determined based on the offset of the position of the peak value of the K space signal acquired under each angle relative to the center of the K space.
Specifically, since the readout encoding portion is simultaneously applied by two gradients (i.e., the above GX and the above GY), the first gradient adjustment value is two values, corresponding to the adjustment values respectively corresponding to the two gradients of the readout encoding; since the phase encoding section is simultaneously applied by two gradients (i.e., GX and GY described above), the second gradient adjustment values are two values, corresponding to the adjustment values of the two gradients of the phase encoding section, respectively.
Step S520, performing correction processing on the first scan sequence based on the first gradient adjustment value and the second gradient adjustment value to obtain a second scan sequence.
In the step, a first gradient adjustment value, namely a first gradient adjustment value corresponding to a read-out coding part of a first scanning sequence under each angle; a second gradient adjustment value corresponding to the phase encoding part of the first scanning sequence under each angle; the second scan sequence is a second scan sequence obtained by performing correction processing on gradients of the readout encoding portion and the phase encoding portion of the first scan sequence, respectively, in the next actual scan process based on the first gradient adjustment value corresponding to the readout encoding portion of the first scan sequence and the second gradient adjustment value corresponding to the phase encoding portion of the first scan sequence, and determining the second scan sequence from the corrected first scan sequence.
Specifically, the specific way of correcting the first scan sequence based on the first gradient adjustment value and the second gradient adjustment value to obtain the second scan sequence may be to correct the gradient value corresponding to the readout encoding portion of the first scan sequence according to the first gradient adjustment value, record the corrected gradient of the readout encoding portion as the readout encoding portion corrected gradient value, correct the gradient value corresponding to the phase encoding portion of the first scan sequence according to the second gradient adjustment value, record the corrected gradient of the phase encoding portion as the phase encoding portion corrected gradient value, replace the gradient value corresponding to the readout encoding portion under each angle of the first scan sequence with the readout encoding portion corrected gradient value corresponding to the angle, replace the gradient value corresponding to the phase encoding portion under each angle of the first scan sequence with the phase encoding portion corrected gradient value corresponding to the angle, and then determine the first scan sequence after the replacement of the gradient value of the readout encoding portion under each angle and the gradient value of the phase encoding portion is completed as the second scan sequence.
In practical application, assuming that GX and GY gradients are used for phase encoding and readout encoding, and ADC represents a signal acquisition axis of analog-to-digital conversion, the specific implementation procedure of steps S510 to S520 may include the following steps:
firstly, respectively calculating the offset of the peak position of the K space signal acquired at each angle relative to the center of the K space, and then respectively calculating the gradient adjustment values (namely a first gradient adjustment value and a second gradient adjustment value) under each angle according to the offset, and recording and storing.
Then, based on the gradient adjustment value, in the process of performing the next actual scanning, corresponding correction processing is performed on the gradient values corresponding to each of GX and GY of the phase encoding part of the first scanning sequence before the ADC is started, and then corresponding correction processing is performed on the gradient values corresponding to each of GX and GY of the readout encoding part while the ADC is started, so that the position of the peak value obtained by actual acquisition is positioned at the center of the K space signal, and the corrected first scanning sequence is further confirmed to be a second scanning sequence for acquiring the scanning data of the object to be detected in the process of the actual scanning.
According to the embodiment of the application, the first gradient adjustment value corresponding to the read-out coding part of the first scanning sequence and the second gradient adjustment value corresponding to the phase coding part of the first scanning sequence are determined based on the offset of the position of the peak value relative to the center of the K space, and the first scanning sequence is corrected based on the first gradient adjustment value and the second gradient adjustment value to obtain the second scanning sequence, so that the problem that the K space signal of the scanning sequence is offset in the actual scanning process is effectively solved, and the data consistency of the K space signal obtained through rotation acquisition is further effectively ensured.
For the specific way to determine the corrected and adjusted first scan sequence as the second scan sequence, in one embodiment, as shown in fig. 6, the step S520 specifically includes:
in step S610, the first scan sequence is corrected based on the first gradient adjustment value and the second gradient adjustment value, so as to obtain a corrected and adjusted first scan sequence.
In the step, the first gradient adjustment value, that is, the first gradient adjustment value corresponding to the readout encoding portion of the first scanning sequence, refers to the first gradient adjustment value corresponding to the readout encoding portion of the first scanning sequence obtained by determining based on the offset of the position of the peak value relative to the center of the K space; the second gradient adjustment value, namely the second gradient adjustment value corresponding to the phase coding part of the first scanning sequence, is determined based on the offset of the position of the peak value relative to the center of the K space; the corrected and adjusted first scan sequence means that the first scan sequence is corrected based on the first gradient adjustment value and the second gradient adjustment value, and then the corrected and adjusted first scan sequence is obtained.
Step S620, a K space signal of the correction module is obtained by adopting the corrected and adjusted first scanning sequence.
In this step, the corrected and adjusted first scan sequence means that the first scan sequence is corrected based on the first gradient adjustment value and the second gradient adjustment value, and then the corrected and adjusted first scan sequence is obtained; the correction die body is arranged on a scanning bed which moves axially in a scanning cavity of the magnetic resonance system and can be used for acquiring K space signals with less noise; the correction of the K space signal of the die body refers to the correction of the first scanning sequence based on the first gradient adjustment value and the second gradient adjustment value, and then the acquisition of the corrected and adjusted first scanning sequence is performed for the correction of the die body, so that the K space signal of the correction of the die body is acquired.
In step S630, if the position of the peak of the K-space signal is less than the preset threshold, the corrected and adjusted first scan sequence is determined as the second scan sequence.
In the step, a K space signal, namely a K space signal of the correction die body, is corrected, and based on the K space signal, the peak value position of the K space signal of the correction die body is positioned; the preset threshold value is a preset distance threshold value used for determining whether the distance between the position of the peak value of the K space signal after correction and adjustment and the center of the K space meets the preset correction and adjustment precision requirement; the second scanning sequence is determined by correcting the adjusted first scanning sequence when the distance between the peak position of the K space signal and the center of the K space is smaller than a preset threshold value.
Specifically, in order to ensure that the correction processing performed on the first scanning sequence meets the preset correction adjustment precision requirement, if the position of the peak value of the K space signal is smaller than a preset threshold value relative to the distance of the K space center, determining the corrected first scanning sequence as the second scanning sequence; if the distance between the peak value of the K space signal and the center of the K space is larger than a preset threshold value, determining that correction processing is needed to be carried out on the first scanning sequence again, acquiring the K space signal of the correction die body based on the first scanning sequence after the correction processing again, determining whether the distance between the peak value of the K space signal and the center of the K space is smaller than the preset threshold value, if not, continuing correction processing on the first scanning sequence until determining that the distance between the peak value of the K space signal of the correction die body, acquired by the first scanning sequence after correction adjustment, is smaller than the preset threshold value.
According to the embodiment of the application, the K space signal of the correction die body is obtained by adopting the corrected and adjusted first scanning sequence, and the corrected and adjusted first scanning sequence is determined to be the second scanning sequence under the condition that the distance between the peak value of the K space signal and the center of the K space is smaller than the preset threshold value, so that the correction and adjustment precision of the scanning sequence is effectively ensured, and the data consistency and the data accuracy of the K space signal obtained through rotation acquisition are further effectively ensured.
For the specific way of obtaining the offset of the ARMS sequence on the readout encoding part and the phase encoding part, in one embodiment, the first scanning sequence is an ARMS sequence; the step S120 specifically includes:
based on the K-space signal, an offset of the ARMS sequence on the readout encoding part and an offset of the ARMS sequence on the phase encoding part are obtained.
The K space signal is a K space signal of the correction die body; ARMS sequence, which refers to a propeller acquisition based motion artifact correction imaging (Acquisition and Reconstruction with Motion Suppression, ARMS) sequence; the offset of the ARMS sequence on the readout encoding part and the offset of the ARMS sequence on the phase encoding part refer to K-space signals based on correction motifs, and the offset of the ARMS sequence on the readout encoding part and the offset of the ARMS sequence on the phase encoding part are calculated at the same time.
Specifically, the specific way to obtain the offset of the ARMS sequence on the readout encoding portion and the offset of the ARMS sequence on the phase encoding portion based on the K-space signal may be to obtain the offset of the peak value of the K-space signal of the correction motif at each rotation angle obtained based on the ARMS sequence with respect to the K-space center, calculate the first gradient adjustment value of the ARMS sequence on the readout encoding portion at that angle and the second gradient adjustment value of the ARMS sequence on the phase encoding portion at that angle at the same time, and then perform correction processing for the ARMS sequence in the next scanning process based on the two gradient adjustment values (i.e., the first gradient adjustment value and the second gradient adjustment value).
In practical application, the specific operation flow of K-space signal acquisition in K-space through an ARMS sequence may be in a form as shown in fig. 2.
According to the embodiment of the application, the ARMS sequence is corrected in a mode of acquiring the gradient adjustment value of the ARMS sequence on the read-out coding part and the gradient adjustment value of the ARMS sequence on the phase coding part based on the K space signal, so that the problem that the K space signal of the scanning sequence is offset in the actual scanning process is effectively solved.
For a specific implementation of the ARMS sequence, in one embodiment, the ARMS sequence is a magnetic resonance sequence that implements motion artifact correction based on a propeller K-space filling method.
The magnetic resonance sequence can be a Fast Spin Echo (FSE) sequence or a gradient Echo sequence, and based on the Fast Spin Echo (FSE) sequence or the gradient Echo sequence, the ARMS sequence can be a magnetic resonance sequence for realizing motion artifact correction by adopting a propeller K space filling method in magnetic resonance imaging equipment.
In particular, ARMS (Acquisition and Reconstruction with Motion Suppression) emphasizes the dual motion artifact overcoming technique in the acquisition and reconstruction process. In view of imaging principle, since in the propeller-based filling, a set of echo signals arranged in parallel forms a propeller blade (blade), and the length of the set of echo signals determines the width of the propeller blade, in the actual acquisition process, the echo signals in units of sets rotate at a certain angle, so that a propeller-type K-space filling is formed. In addition, each group of echo signals can pass through the center of the K space, so that the K space center realizes oversampling acquisition with a certain degree of capability of overcoming motion artifacts.
In one embodiment, the ARMS sequence may be degenerated to a radial acquisition sequence by reducing the width of the blades of one propeller of the ARMS sequence to 1, wherein the specific operational procedure for K-space signal acquisition using the radial acquisition sequence may be of the form shown in fig. 7. In the form of a radial acquisition sequence, the corresponding phase coding number of each slurry slice is 1, and the corresponding K space signal has no offset relative to the phase coding direction, namely the offset of the K space signal in the phase coding direction is zero (the second gradient adjustment value corresponding to the phase coding part is zero); however, since the offset of the readout encoding portion still exists, the first gradient adjustment value can still be acquired and calculated by the aforementioned method, and then correction is performed on this form of scanning sequence (i.e., radial acquisition sequence). In view of the fact that the foregoing specific implementation method for correcting the radial acquisition sequence is consistent with the steps described in the foregoing method embodiments, no further description is given here.
In some embodiments of the application, a magnetic resonance imaging method for acquiring a reconstructed image of an object to be measured is also provided. For a specific way of acquiring the reconstructed image of the object to be measured, in one embodiment, as shown in fig. 8, after the above step S120, the following steps may be adopted instead of the above steps S130 to S140:
Step S810, based on the first scanning sequence, obtaining scanning data of the object to be detected.
In this step, the first scan sequence is assigned to a scan device of the magnetic resonance system; the object to be detected is a target object which is placed on a scanning bed axially moving in a scanning cavity of the magnetic resonance system and has the requirement of scanning and imaging by using the magnetic resonance system; the scan data of the object to be measured refers to the obtained scan data of the object to be measured based on a first scan sequence configured in a scanning device of the magnetic resonance system.
Specifically, the specific expression form of the scan data of the object to be measured may be a K-space signal of the object to be measured.
Step S820, determining a plurality of image reconstruction parameters according to the offset.
In the step, the offset, namely the offset of the magnetic resonance system, refers to the offset of the magnetic resonance system obtained based on the K space signal of the correction die body acquired by the first scanning sequence; the number of image reconstruction parameters may be a plurality of image reconstruction parameters, i.e. the number of image reconstruction parameters is more than one, based on which a reconstructed image may be obtained.
Specifically, the offset of the magnetic resonance system can be obtained based on the K-space signal of the correction phantom acquired by the first scanning sequence, so as to determine a plurality of image reconstruction parameters which can be used for obtaining the reconstructed image of the object to be measured.
Step S830, adopting each image reconstruction parameter to obtain a reconstructed image of the object to be detected.
In the step, each image reconstruction parameter refers to an image reconstruction parameter which is acquired based on a K space signal of a correction die body acquired by a first scanning sequence, acquired offset of an acquired magnetic resonance system and determined to be used for acquiring a reconstructed image of an object to be detected; the reconstructed image of the object to be measured refers to the image reconstruction for the scan data of the object to be measured based on the image reconstruction parameters that can be used to obtain the reconstructed image of the object to be measured, so as to obtain the reconstructed image of the object to be measured.
It should be understood that although in the present embodiment, the step S810 is located after the step S120, in practical applications, the step S810 may also be performed before the step S120 or simultaneously with the step S120, i.e. a scan is performed through the first scan sequence, and K-space data of the calibration phantom and the object to be measured are acquired.
According to the magnetic resonance imaging method provided by the embodiment of the application, the scanning data of the object to be detected is obtained based on the first scanning sequence, a plurality of image reconstruction parameters are determined according to the offset, and the image reconstruction parameters are adopted to obtain the reconstructed image of the object to be detected, so that the imaging quality of the reconstructed image of the object to be detected is effectively ensured.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a correction device of the magnetic resonance system for realizing the correction method of the magnetic resonance system. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation in the embodiments of the correction device for one or more magnetic resonance systems provided below may be referred to the limitation of the correction method for a magnetic resonance system hereinabove, and will not be repeated here.
In one embodiment, as shown in fig. 9, there is provided a correction device of a magnetic resonance system, the correction device comprising:
at least one calibration phantom for placement with an object to be measured within a scan cavity of the magnetic resonance system;
a K-space signal acquisition module 910, configured to rotationally acquire a K-space signal of the correction phantom using a first scan sequence configured by the magnetic resonance system;
an offset obtaining module 920, configured to obtain an offset of the magnetic resonance system based on the K-space signal;
a second scan sequence obtaining module 930, configured to perform correction processing on the first scan sequence according to the offset to obtain a second scan sequence;
and a scan data obtaining module 940, configured to obtain scan data of the object to be measured based on the second scan sequence.
In one embodiment, the K-space signal is acquired by performing a plurality of angular rotational acquisitions of the correction phantom; the offset obtaining module 920 is specifically configured to obtain a position where a peak value of the K space signal acquired by each angle is located; and obtaining the offset of the position of the peak value relative to the center of the K space according to the position of the peak value.
In one embodiment, the second scan sequence obtaining module 930 is specifically configured to determine, based on an offset of the position of the peak relative to the K-space center, a first gradient adjustment value corresponding to a readout encoding portion of the first scan sequence and a second gradient adjustment value corresponding to a phase encoding portion of the first scan sequence; and correcting the first scanning sequence based on the first gradient adjustment value and the second gradient adjustment value to obtain the second scanning sequence.
In one embodiment, the second scan sequence obtaining module 930 is further configured to perform correction processing on the first scan sequence based on the first gradient adjustment value and the second gradient adjustment value, to obtain a corrected and adjusted first scan sequence; acquiring a K space signal of the correction die body by adopting the corrected and adjusted first scanning sequence; and if the position of the peak value of the K space signal is smaller than a preset threshold value, determining the corrected and adjusted first scanning sequence as the second scanning sequence.
In one embodiment, the first scan sequence is an ARMS sequence; the offset obtaining module 920 is further configured to obtain an offset of the ARMS sequence on the readout encoding part and an offset of the ARMS sequence on the phase encoding part based on the K-space signal.
In one embodiment, in the offset acquisition module 920, the ARMS sequence is a magnetic resonance sequence that implements motion artifact correction based on a propeller K-space filling method.
The respective modules in the correction device of the magnetic resonance system described above may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a server, and the internal structure of which may be as shown in fig. 10. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is used for storing data such as correction related data of the magnetic resonance system. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of correcting a magnetic resonance system.
It will be appreciated by those skilled in the art that the structure shown in FIG. 10 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a processing terminal is provided, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the method embodiments described above when the processor executes the computer program.
In one embodiment, a magnetic resonance system is provided, comprising a scanning bed, a scanning device, and the processing terminal described above; wherein:
the scanning bed is used for placing an object to be tested and at least one correction die body;
the scanning equipment is used for collecting and outputting K space signals of the correction die body and scanning data of the object to be detected; the scanning device is used for configuring a scanning sequence.
The correction die body is placed on a scanning bed which moves axially in a scanning cavity of the magnetic resonance system and can be used for acquiring K space signals with less noise; the object to be detected is a target object which is placed on a scanning bed axially moving in a scanning cavity of the magnetic resonance system and has the requirement of scanning and imaging by using the magnetic resonance system; the scanning equipment collects and outputs K space signals of the correction module body and scanning data of the object to be detected through a scanning sequence configured in the scanning equipment; the scan sequence to be arranged in the scan device may be the first scan sequence or the second scan sequence.
Specifically, the number of calibration phantom to be placed can be determined based on the volume of the object to be measured, and when the volume of the object to be measured is small, a plurality of calibration phantoms can be placed on a scanning bed of the magnetic resonance system, or the object to be measured and the calibration phantoms on the scanning bed of the magnetic resonance system are simultaneously placed in an effective imaging area of a scanning device of the magnetic resonance system; under the condition that the steps S110 to S140 are executed by adopting the magnetic resonance system, configuring the first scanning sequence in scanning equipment of the magnetic resonance system so as to acquire and output K space signals of a correction die body, and configuring the second scanning sequence in the scanning equipment of the magnetic resonance system so as to acquire and output scanning data of an object to be detected; under the condition that the steps S110 to S120 and the steps S810 to S830 are executed by using the magnetic resonance system, configuring the first scanning sequence in a scanning device of the magnetic resonance system, collecting and outputting a K space signal of a correction die body and scanning data of an object to be detected, calculating an offset of the magnetic resonance system based on the K space signal of the correction die body collected by the first scanning sequence, and performing image reconstruction on the scanning data of the object to be detected by using a plurality of image reconstruction parameters calculated based on the offset of the magnetic resonance system, thereby obtaining a reconstructed image of the object to be detected.
In practical application, the specific expression form of the correction die body can be a water die body, a biological die body and the like.
According to the embodiment of the application, by means of placing the object to be detected and at least one correction die body on the scanning bed of the magnetic resonance system, in the whole scanning process, K space signals of the correction die body can be acquired first, then the object to be detected is sent into an effective imaging area of the magnetic resonance system by controlling the movement of the scanning bed, so that scanning data of the object to be detected are acquired, real-time correction of K space signal offset of a scanning sequence can be realized without additional manual operation in the whole scanning process, and further data consistency and data accuracy of the K space signals acquired through rotation are effectively ensured.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the method embodiments described above.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The user information (including but not limited to user equipment information, user personal information, etc.) and the data (including but not limited to data for analysis, stored data, presented data, etc.) related to the present application are information and data authorized by the user or sufficiently authorized by each party.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (10)
1. A method of calibrating a magnetic resonance system, wherein an object to be measured and at least one calibration phantom are placed in a scanning cavity of the magnetic resonance system, and wherein the magnetic resonance system is configured with a first scanning sequence, the method comprising:
Adopting the first scanning sequence to rotationally acquire K space signals of the correction die body;
acquiring the offset of the magnetic resonance system based on the K space signal;
correcting the first scanning sequence according to the offset to obtain a second scanning sequence;
and obtaining the scanning data of the object to be detected based on the second scanning sequence.
2. The method of claim 1, wherein the K-space signal is acquired by performing a plurality of angular rotational acquisitions of the correction phantom;
the acquiring the offset of the magnetic resonance system based on the K-space signal includes:
acquiring the position of the peak value of the K space signal acquired by each angle;
and obtaining the offset of the position of the peak value relative to the center of the K space according to the position of the peak value.
3. The method of claim 2, wherein the correcting the first scan sequence according to the offset to obtain a second scan sequence comprises:
determining a first gradient adjustment value corresponding to a read-out coding part of the first scanning sequence and a second gradient adjustment value corresponding to a phase coding part of the first scanning sequence based on the offset of the position of the peak value relative to the center of the K space;
And correcting the first scanning sequence based on the first gradient adjustment value and the second gradient adjustment value to obtain the second scanning sequence.
4. A method according to claim 3, wherein said correcting said first scan sequence based on said first gradient adjustment value and said second gradient adjustment value to obtain said second scan sequence comprises:
based on the first gradient adjustment value and the second gradient adjustment value, correcting the first scanning sequence to obtain a corrected and adjusted first scanning sequence;
acquiring a K space signal of the correction die body by adopting the corrected and adjusted first scanning sequence;
and if the position of the peak value of the K space signal is smaller than a preset threshold value, determining the corrected and adjusted first scanning sequence as the second scanning sequence.
5. The method of claim 1, wherein the first scan sequence is an ARMS sequence;
the acquiring the offset of the magnetic resonance system based on the K-space signal includes:
based on the K-space signal, an offset of the ARMS sequence on a readout encoding portion and an offset of the ARMS sequence on a phase encoding portion are obtained.
6. The method of claim 5, wherein the ARMS sequence is a magnetic resonance sequence that achieves motion artifact correction based on a propeller K-space filling method.
7. A correction device for a magnetic resonance system, the correction device comprising:
at least one calibration phantom for placement with an object to be measured within a scan cavity of the magnetic resonance system;
the K space signal acquisition module is used for rotationally acquiring the K space signal of the correction die body by adopting a first scanning sequence configured by the magnetic resonance system;
the offset acquisition module is used for acquiring the offset of the magnetic resonance system based on the K space signal;
the second scanning sequence acquisition module is used for correcting the first scanning sequence according to the offset to obtain a second scanning sequence;
and the scanning data acquisition module is used for acquiring the scanning data of the object to be detected based on the second scanning sequence.
8. A processing terminal comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.
9. A magnetic resonance system comprising a scanning bed, a scanning device, and a processing terminal according to claim 8; wherein:
the scanning bed is used for placing an object to be tested and at least one correction die body;
the scanning equipment is used for collecting and outputting the K space signal of the correction die body and the scanning data of the object to be detected; the scanning device is used for configuring a scanning sequence.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
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