CN110261804B - Magnetic resonance scanning method, magnetic resonance scanning device, computer equipment and storage medium - Google Patents
Magnetic resonance scanning method, magnetic resonance scanning device, computer equipment and storage medium Download PDFInfo
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- CN110261804B CN110261804B CN201910452372.0A CN201910452372A CN110261804B CN 110261804 B CN110261804 B CN 110261804B CN 201910452372 A CN201910452372 A CN 201910452372A CN 110261804 B CN110261804 B CN 110261804B
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
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Abstract
The present application relates to a magnetic resonance scanning method, apparatus, computer device and storage medium. The method comprises the following steps: determining a scanning protocol according to the received scanning instruction, wherein the scanning protocol comprises a calibration sequence and an imaging sequence set; determining a first imaging coil combination according to a first imaging sequence in the set of imaging sequences; determining a calibration coil combination corresponding to a calibration sequence according to the position of a coil unit in the magnetic resonance scanning equipment and a preset scanning range, wherein the calibration coil combination comprises a first imaging coil combination; obtaining calibration data based on the calibration sequence and the corresponding calibration coil combination, and obtaining imaging data based on each imaging sequence in the imaging sequence set and the imaging coil combination corresponding to each imaging sequence; calibrating imaging data corresponding to each imaging sequence in the imaging sequence set according to the calibration coil; and carrying out correction scanning according to the correction coil combination to obtain an image with uniform correction. By adopting the method, the time can be saved and the scanning efficiency can be improved.
Description
Technical Field
The present application relates to the field of medical image processing technologies, and in particular, to a magnetic resonance scanning method, an apparatus, a computer device, and a storage medium.
Background
Magnetic Resonance Imaging (MRI) technology is a medical image imaging technology. Since the brightness unevenness of the magnetic resonance image affects the diagnosis result, it is usually necessary to correct the brightness of the image to obtain a uniform image. The nonuniformity in the magnetic resonance image is mainly caused by the nonuniform spatial sensitivity of the surface phased array coil unit, while the nonuniformity of the receiving field of the local coil in the phased array coil unit is mainly the self-characteristic of the phased array receiving coil, namely, different coil combinations have different receiving sensitivity distribution characteristics. When the local coil units of the phased array are used to receive magnetic resonance signals, different coil combinations are used to have different receiving sensitivity distribution characteristics, i.e., different brightness non-uniformity characteristics are shown on the image. The non-uniform correction generally ensures that a coil combination used by the correction scanning is consistent with a coil unit of the clinical imaging scanning, and the visual field range is larger than that of the clinical imaging scanning, so that the sensitivity distribution in the visual field range of the corresponding coil combination can be obtained by solving in a correction algorithm, and the clinical image can be directly corrected. Therefore, in the conventional correction method, the elements of the correction scan are usually set after the current clinical imaging scan is determined, and after the imaging of the subsequent clinical imaging scan is determined, the system determines whether the data of the correction scan of the current scan can be reused. The data of the current clinical scan or the resolved sensitivity profile can be directly multiplexed into the mura correction of the subsequent clinical image only if the subsequent clinical scan satisfies that the coil combinations are consistent and the field of view is contained.
However, when a series of clinical protocol scans are performed on a part of a patient, there is adjustment of the sagittal, coronal, and sagittal planes, or the scan field size needs to be adjusted, i.e., the combination of coil units selected according to the series of clinical protocols is also adjusted. Once a change in the coil unit combination adjustment occurs, the calibration scan data between different clinical protocols will not be reusable, requiring re-determination of the conditions for the calibration scan and re-execution of the calibration scan, resulting in a low time efficiency.
Disclosure of Invention
In view of the above, it is necessary to provide a magnetic resonance scanning method, apparatus, computer device and storage medium capable of shortening the time period and improving the efficiency.
A magnetic resonance scanning method, the method comprising:
determining a scanning protocol according to the received scanning instruction, wherein the scanning protocol comprises a calibration sequence and an imaging sequence set;
determining a first imaging coil combination from a first imaging sequence of the set of imaging sequences;
determining a calibration coil combination corresponding to the calibration sequence according to the position of a coil unit in the magnetic resonance scanning equipment and a preset scanning range, wherein the calibration coil combination comprises the first imaging coil combination;
obtaining calibration data based on the calibration sequence and the corresponding calibration coil combination, and obtaining imaging data based on each imaging sequence in the imaging sequence set and the imaging coil combination corresponding to each imaging sequence;
calibrating the imaging data corresponding to each imaging sequence in the imaging sequence set according to the calibration data;
and reconstructing the calibrated imaging data to obtain a calibrated magnetic resonance image.
In one embodiment, the step of calibrating, according to the calibration data, the imaging data corresponding to each imaging sequence in the imaging sequence set includes:
extracting calibration data corresponding to the imaging data from the calibration data according to the coil combination corresponding to the imaging data;
and calibrating the imaging data by utilizing calibration data corresponding to the imaging data.
In one embodiment, the step of calibrating the imaging data by using calibration data corresponding to the imaging data includes:
carrying out sensitivity calculation according to calibration data corresponding to the imaging data to obtain sensitivity distribution information;
and calibrating the imaging data according to the sensitivity distribution information.
In one embodiment, when determining that reusable sensitivity distribution information exists in the imaging data according to the coil combination corresponding to the imaging data, the reusable sensitivity distribution information is used as calibration data corresponding to the imaging data.
In one embodiment, the step of determining a calibration coil combination corresponding to the calibration sequence according to the position of the coil unit in the magnetic resonance scanning apparatus and the preset scanning range, where the calibration coil combination includes the first imaging coil combination, includes:
when the position of a coil unit in the magnetic resonance scanning equipment is within the preset scanning range, combining the coil units within the preset scanning range to obtain a predicted coil combination;
and adding the first imaging coil combination into the predicting coil combination to obtain a calibration coil combination corresponding to the calibration sequence.
In one of the embodiments, the first and second electrodes are,
the set of imaging sequences comprises a first imaging sequence and a second imaging sequence;
the first imaging sequence and the second imaging sequence respectively correspond to different sections of the same scanning part;
or the first imaging sequence and the second imaging sequence correspond to the same section of the same scanning part, and the scanning ranges corresponding to the first imaging sequence and the second imaging sequence are different;
the cut plane includes at least one of a transverse plane, a sagittal plane, and a coronal plane.
In one embodiment, the step of obtaining calibration data based on the calibration sequence and the corresponding calibration coil combination, and obtaining imaging data based on each imaging sequence in the set of imaging sequences and the imaging coil combination corresponding to each imaging sequence includes:
controlling the magnetic resonance scanning equipment to excite the calibration sequence to carry out calibration scanning, and collecting calibration data obtained by calibration scanning by using a calibration coil combination corresponding to the calibration sequence;
and sequentially controlling the magnetic resonance scanning equipment to excite each imaging sequence in the imaging sequence set to carry out imaging scanning, and acquiring imaging data obtained by the imaging scanning by using the imaging coil combination corresponding to the imaging sequence.
A magnetic resonance scanning apparatus, the apparatus comprising:
the determining module is used for determining a scanning protocol according to the received scanning instruction, wherein the scanning protocol comprises a calibration sequence and an imaging sequence set;
the determining module is further configured to determine a first imaging coil combination according to a first imaging sequence in the set of imaging sequences;
the prediction module is used for determining a calibration coil combination corresponding to the calibration sequence according to the position of a coil unit in the magnetic resonance scanning equipment and a preset scanning range, wherein the calibration coil combination comprises the first imaging coil combination;
the control module is used for obtaining calibration data based on the calibration sequence and the corresponding calibration coil combination, and obtaining imaging data based on each imaging sequence in the imaging sequence set and the imaging coil combination corresponding to each imaging sequence;
the calibration module is used for calibrating the imaging data corresponding to each imaging sequence in the imaging sequence set according to the calibration data;
and the reconstruction module is used for reconstructing the calibrated imaging data to obtain a calibrated magnetic resonance image.
In one embodiment, the prediction module is further configured to, when the device coil position is within the preset scanning range, obtain a coil unit corresponding to the device coil position;
determining the coil unit as a second coil combination.
A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the magnetic resonance scanning method of any of the above when executing the computer program.
A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the magnetic resonance scanning method of any one of the preceding claims.
The magnetic resonance scanning method, the magnetic resonance scanning device, the computer equipment and the storage medium determine a scanning protocol according to the received scanning instruction, wherein the scanning protocol comprises a calibration sequence and an imaging sequence set. A first imaging coil combination is determined from a first imaging sequence of the set of imaging sequences, thereby ensuring that the coil unit of the first imaging sequence is selected. And then, determining a calibration coil combination corresponding to the calibration sequence according to the position of the coil unit in the magnetic resonance scanning equipment and a preset scanning range, wherein the calibration coil combination comprises a first imaging coil combination, thereby ensuring that the calibration coils corresponding to all imaging sequences in the imaging sequence set are obtained. When the calibration data is obtained based on the calibration sequence and the corresponding calibration coil combination, and the imaging data is obtained based on the imaging sequence and the corresponding imaging coil combination, the calibration data is used for directly calibrating all the imaging data, and the calibrated imaging data is reconstructed to obtain the magnetic resonance image, so that the multiplexing of the calibration data is realized, the conditions of correction scanning do not need to be determined again after the first clinical protocol scanning is finished, and the correction scanning does not need to be carried out again to obtain new calibration data, so that the time is saved, and the efficiency is high.
Drawings
FIG. 1 is a diagram illustrating an exemplary embodiment of a magnetic resonance scanning method;
figure 2 is a flow chart of a magnetic resonance scanning method in one embodiment;
FIG. 3 is a flowchart illustrating a calibration procedure performed on imaging data corresponding to each imaging sequence in the set of imaging sequences according to calibration data in an embodiment;
figure 4 is a block diagram of the structure of a magnetic resonance scanner in one embodiment;
FIG. 5 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The magnetic resonance imaging method provided by the application can be applied to the application environment as shown in fig. 1. Wherein the magnetic resonance imaging apparatus 102 communicates with the magnetic resonance scanning device 104 via a network. The magnetic resonance imaging apparatus 102 determines a scan protocol from the received scan instructions, the scan protocol including a calibration sequence and a set of imaging sequences. The magnetic resonance imaging apparatus 102 determines a first imaging coil combination from a first imaging sequence of the set of imaging sequences. The magnetic resonance imaging apparatus 102 determines a calibration coil combination corresponding to the calibration sequence according to the position of the coil unit in the magnetic resonance scanning device 104 and the preset scanning range, and the calibration coil combination includes a first imaging coil combination. The magnetic resonance imaging apparatus 102 obtains calibration data based on the calibration sequences and the corresponding calibration coil combinations, and obtains imaging data based on each imaging sequence in the set of imaging sequences and the corresponding imaging coil combination of each imaging sequence. The magnetic resonance imaging apparatus 102 calibrates the imaging data corresponding to each imaging sequence in the set of imaging sequences according to the calibration data. The magnetic resonance imaging device 102 reconstructs the calibrated imaging data to obtain a calibrated magnetic resonance image. The magnetic resonance imaging apparatus 102 may be, but is not limited to, a server, various personal computers, a notebook computer, a smart phone, a tablet computer, and a portable wearable device. The server includes, but is not limited to, an independent server or a server cluster composed of a plurality of servers.
In one embodiment, as shown in fig. 2, a magnetic resonance scanning method is provided, which is exemplified by the application of the method to the magnetic resonance imaging apparatus of fig. 1, and includes the following steps:
step S202, determining a scanning protocol according to the received scanning instruction, wherein the scanning protocol comprises a calibration sequence and an imaging sequence set.
The scanning instruction refers to a request for instructing scanning, the scanning protocol refers to a related scanning sequence required in scanning, including a calibration sequence and an imaging sequence set, and the sequence refers to setting and arrangement of related parameters such as radio frequency pulse, gradient field, signal acquisition time and the like on a time sequence. The calibration sequence is a sequence for acquiring calibration data, and the set of imaging sequences includes a plurality of imaging sequences for actually clinically acquiring the sequence of imaging data. For example, the imaging sequence may include a first imaging sequence, a second imaging sequence, and the two imaging sequences may include one or more of a repetition Time (TR), a return Time (TE), an inversion Time (TI), an imaging field of view (FOV), a Flip Angle (FA), a Number of Slices (NSL), a layer thickness (slice thickness), a layer pitch (slice gap), a Number of Excitations (NEX), an echo chain length (ETL), a sampling Bandwidth (BWTH), a phase encoding direction to readout direction field of view (phase FOV ratio), a phase encoding direction, and a phase encoding Number (NPE). In one embodiment, the first imaging sequence and the second imaging sequence correspond to different slices of the same scanning region, and the slice may be at least one of a transverse plane, a sagittal plane and a coronal plane, i.e. the two only encode in different directions, and the other parameters are the same. In one embodiment, the first imaging sequence and the second imaging sequence correspond to the same slice of the same scanning portion, and the scanning ranges of the first imaging sequence and the second imaging sequence are different.
Specifically, when a scanning instruction is received, a scanning sequence is determined according to a sequence identifier carried in the scanning instruction. The sequence identifier is a mark used for searching a corresponding scanning sequence, and the corresponding scanning sequence can be obtained through the unique sequence identifier. The calibration sequence may be determined from a sequence identification of the calibration sequence. For example, when a user has a scanning requirement, the sequence identifier of the scanning sequence required by the current scanning can be selected through the connected input device or the sequence identifier corresponding to the required scanning sequence can be directly input, and a scanning instruction is generated after clicking is determined. And when the scanning imaging device receives a scanning instruction issued by a user, determining a scanning protocol according to the sequence identification carried by the scanning instruction.
Step S204, a first imaging coil combination is determined according to a first imaging sequence in the imaging sequence set.
Although the imaging sequence set includes a plurality of imaging sequences, when performing imaging scanning, scanning is sequentially performed one by one according to the imaging sequences. Thus, the first imaging sequence is the first sequence used in this scan. The first imaging coil assembly is a coil assembly corresponding to the first imaging sequence, and the coil is an important component of the magnetic resonance scanning apparatus, and the scanning and examination of all the magnetic resonance scanning apparatuses need to be completed by the coil, for example, the coil is used to transmit radio frequency pulses, receive magnetic resonance signals, and the like. Generally, different coils are used according to the structure and the purpose of examination, a scanning protocol used for scanning examination includes coil units required for the current scanning examination, and the corresponding coil units can be obtained according to the scanning protocol. That is, the coil units corresponding to the first imaging sequence can be acquired according to the first imaging sequence, and since the coil units used in one scan are not limited to one, the combination of the coil units is called a coil combination.
Specifically, after the imaging sequence set is determined, a first scanning sequence, i.e., a first imaging sequence, is acquired from the imaging sequence set. And determining coil units required by the first imaging sequence according to the first imaging sequence, and combining the coil units into a coil combination, namely the first imaging coil combination corresponding to the first imaging sequence.
Step S206, determining a calibration coil combination corresponding to the calibration sequence according to the position of the coil unit in the magnetic resonance scanning device and a preset scanning range, wherein the calibration coil combination comprises a first imaging coil combination.
The position of each coil unit in the magnetic resonance scanning equipment is the position of each coil unit in the magnetic resonance scanning equipment, the preset scanning range is the preset scanning visual field, and the calibration coil combination refers to each coil unit for acquiring calibration data when calibration scanning is carried out.
Specifically, the position of the coil unit is known information of the magnetic resonance scanning device, and the preset scanning range is set in advance and stored in the magnetic resonance imaging device. When the magnetic resonance imaging device obtains a first imaging coil combination corresponding to a first imaging sequence, the position and the preset scanning range of a coil unit in the magnetic resonance scanning equipment are obtained, the coil units possibly needed by calibration scanning are predicted according to the preset scanning range, all the coil units are combined into a coil combination, and the coil combination is a calibration coil combination. In order to ensure that the coil units of the first imaging sequence are selected, the obtained first imaging coil combination is also added to the calibration coil combination, and the obtained calibration coil combination is combined into a final coil combination.
Step S208, calibration data is obtained based on the calibration sequences and the corresponding calibration coil combinations, and imaging data is obtained based on each imaging sequence in the imaging sequence set and the imaging coil combination corresponding to each imaging sequence.
The calibration data is data for calibrating imaging data, and the imaging data is data for performing a graph reconstruction to obtain a corresponding magnetic resonance image.
In one embodiment, the obtaining calibration data based on the calibration sequence and the corresponding calibration coil combination, and the obtaining imaging data based on each imaging sequence in the imaging sequence set and the imaging coil combination corresponding to each imaging sequence specifically include: and controlling the magnetic resonance scanning equipment to excite the calibration sequence to carry out calibration scanning, and acquiring calibration data obtained by the calibration scanning by using the calibration coil combination corresponding to the calibration sequence. And sequentially controlling the magnetic resonance scanning equipment to excite each imaging sequence in the imaging sequence set to perform imaging scanning, and acquiring imaging data obtained by the imaging scanning by using the imaging coil combination corresponding to the imaging sequence.
Specifically, after the calibration coil combination is determined, calibration scanning can be performed according to the calibration sequence and the calibration coil combination, and calibration data can be acquired. For example, the magnetic resonance imaging apparatus sends the calibration sequence to the magnetic resonance scanning device, controls the magnetic resonance scanning device to excite the calibration sequence to perform calibration scanning, and simultaneously acquires calibration data obtained by the calibration scanning by using a calibration coil corresponding to the calibration sequence. Similarly, after the imaging sequence set is determined, imaging scanning is sequentially performed through the imaging sequence and the corresponding imaging coil, and corresponding imaging data are acquired. The magnetic resonance imaging device sends the imaging sequence to the magnetic resonance scanning equipment, controls the magnetic resonance scanning equipment to excite the imaging sequence to carry out imaging scanning, and acquires imaging data by using the imaging coil combination corresponding to the imaging sequence. The scanning in the imaging scanning set is carried out in sequence according to the scanning sequence, and the scanning of the current imaging sequence can be carried out only after the scanning of the preorder imaging sequence is completed.
And step S210, calibrating the imaging data corresponding to each imaging sequence in the imaging sequence set according to the calibration coil.
Step S212, the calibrated imaging data is reconstructed to obtain a calibrated magnetic resonance image.
Specifically, after the calibration data and the imaging data corresponding to each imaging sequence are obtained, the imaging data are calibrated by using the calibration data. And when the image reconstruction is carried out, the image reconstruction is carried out on the calibrated imaging data, and the obtained image is a calibrated magnetic resonance image. That is, each imaging data has a corresponding magnetic resonance image, i.e., how many imaging sequences are included in the set of imaging sequences, i.e., how many corresponding magnetic resonance images are.
Further, since the imaging scans are sequentially scanned in the scanning order, each time one imaging sequence completes scanning and calibration, the scanning and calibration of the next imaging sequence is performed. It is to be understood that, assuming that the set of imaging sequences includes three imaging sequences, the first imaging sequence, the second imaging sequence and the third imaging sequence are respectively in the scanning order. Therefore, after calibration data is obtained by calibration scanning, firstly, imaging scanning is performed according to a first imaging sequence in the imaging sequence set and a corresponding first imaging coil combination, the obtained imaging data is first imaging data, after the calibration data is used for calibrating the first imaging data, and image reconstruction is performed on the calibrated first imaging data to obtain a first magnetic resonance image, then, imaging scanning is performed according to a second imaging sequence and a corresponding second imaging coil combination to obtain corresponding second imaging data, and similarly, the calibration data is used for calibrating the second imaging data. Of course, calibration data of the first imaging data may be reused for calibration of the second imaging data when the first imaging coil assembly is partially or fully contained in the second imaging coil assembly.
In the magnetic resonance scanning method, the magnetic resonance scanning device, the computer device and the storage medium, a scanning protocol is determined according to the received scanning instruction, and the scanning protocol comprises a calibration sequence and an imaging sequence set. A first imaging coil combination is determined from a first imaging sequence of the set of imaging sequences, thereby ensuring that the coil unit of the first imaging sequence is selected. And then, determining a calibration coil combination corresponding to the calibration sequence according to the position of the coil unit in the magnetic resonance scanning equipment and a preset scanning range, wherein the calibration coil combination comprises a first imaging coil combination, thereby ensuring that the calibration coils corresponding to all imaging sequences in the imaging sequence set are obtained. When the calibration data is obtained based on the calibration sequence and the corresponding calibration coil combination, and the imaging data is obtained based on the imaging sequence and the corresponding imaging coil combination, the calibration data is used for directly calibrating all the imaging data, and the calibrated imaging data is reconstructed to obtain the magnetic resonance image, so that the multiplexing of the calibration data is realized, the conditions of correction scanning do not need to be determined again after the first clinical protocol scanning is finished, and the correction scanning does not need to be carried out again to obtain new calibration data, so that the time is saved, and the efficiency is high.
In one embodiment, as shown in fig. 3, calibrating the imaging data corresponding to each imaging sequence in the set of imaging sequences according to the calibration data includes the following steps:
step S302, according to the coil combination corresponding to the imaging data, calibration data corresponding to the imaging data is extracted from the calibration data.
When the calibration data is used to calibrate the imaging data, it is necessary to ensure that the coil units used for the calibration scan are consistent with the coil units used for the imaging scan. The calibration coil combinations corresponding to the calibration data in this embodiment include coil combinations of all imaging sequences in the imaging sequence set. Therefore, after any imaging sequence obtains the corresponding imaging data, the calibration data corresponding to the imaging data is extracted from the calibration data according to the coil combination corresponding to the imaging sequence.
Specifically, assuming that the imaging data is first imaging data corresponding to a first imaging sequence, and a first imaging coil combination corresponding to the first imaging sequence includes the coil unit 1, the coil unit 2, and the coil unit 3, the coil unit 1, the coil unit 2, and the coil unit 3 are determined from the calibration coil combination, and calibration data acquired by the coil unit 1, the coil unit 2, and the coil unit 3 in the calibration coil combination is acquired. That is, the calibration data corresponding to the first imaging data is the calibration data acquired by the coil unit 1, the calibration data acquired by the coil unit 2, and the calibration data acquired by the coil unit 3.
And step S304, calibrating the imaging data by using the calibration data corresponding to the imaging data.
Specifically, the brightness of the imaging data is calibrated by using calibration data corresponding to the imaging data, so as to obtain imaging data with uniform brightness.
In one embodiment, calibrating the imaging data using calibration data corresponding to the imaging data specifically includes: and carrying out sensitivity calculation according to the calibration data corresponding to the imaging data to obtain sensitivity distribution information. The imaging data is calibrated based on the sensitivity distribution information.
Among them, the image nonuniformity in magnetic resonance imaging is due to the nonuniform spatial sensitivity of the local coil, so the coil sensitivity of the region to be imaged is usually acquired in advance by calibration coil scanning, and the image is calibrated for uniformity based on the sensitivity.
Specifically, after calibration data corresponding to the imaging data is determined, sensitivity calculation is performed based on the calibration data to obtain sensitivity distribution information, where the sensitivity distribution information includes distribution of uneven image brightness. Therefore, imaging data in which the luminance is not uniform in the imaging data is determined from the sensitivity distribution information, thereby determining a luminance-non-uniform image area. And then, carrying out brightness correction adjustment on the areas with uneven brightness to obtain an image with even brightness correction.
In one embodiment, when reusable sensitivity distribution information exists in the imaging data according to the coil combination corresponding to the imaging data, the reusable sensitivity distribution information is used as calibration data corresponding to the imaging data. When imaging data are calibrated according to corresponding calibration data, the imaging data are directly calibrated according to reusable sensitivity distribution information, sensitivity distribution information is obtained without extracting corresponding calibration data from the calibration data and performing sensitivity calculation, resources are saved, and efficiency is improved.
Specifically, if there is calibrated imaging data before the currently calibrated imaging data, and there is an imaging coil combination corresponding to the calibrated imaging data that is the same as the imaging coil combination corresponding to the currently calibrated imaging data, the sensitivity distribution information of the imaging data having the same imaging coil combination can be directly obtained, and the sensitivity distribution information is reusable sensitivity distribution information. And directly carrying out brightness calibration on the imaging data currently subjected to calibration according to the reusable sensitivity distribution information. For example, assume that there are imaging sequence 1, imaging sequence 2, and the imaging coil combination of imaging sequence 1 coincides with the imaging coil combination of imaging sequence 2. When the imaging data corresponding to the imaging sequence 1 has been calibrated, the sensitivity distribution information during the calibration of the imaging data corresponding to the imaging sequence 1 can be directly multiplexed when the imaging data corresponding to the imaging sequence 2 is calibrated.
In this embodiment, if the preorder imaging sequence with consistent imaging coil combinations is included, the sensitivity distribution information of the imaging data corresponding to the preorder imaging sequence can be directly multiplexed, which not only saves the scanning time, but also saves the calculation time. The preamble imaging sequence is a sequence that has already completed imaging calibration before imaging calibration is performed on the current imaging sequence.
In one embodiment, determining a calibration coil combination corresponding to a calibration sequence according to a position of a coil unit in a magnetic resonance scanning apparatus and a preset scanning range specifically includes: and when the position of the coil unit in the magnetic resonance scanning equipment is within a preset scanning range, combining the coil units within the preset scanning range to obtain a predicted coil combination. And adding the first imaging coil combination into the predicting coil combination to obtain a calibration coil combination corresponding to the calibration sequence.
Specifically, after a preset scanning range is obtained, a predicted scanning range is obtained by extending to the periphery based on the preset scanning range. And determining the coil unit within the predicted scanning range according to the position of the coil unit in the magnetic resonance scanning device, namely if the position of the coil unit in the magnetic resonance scanning device is contained in the predicted scanning range, determining that the position of the coil unit is within the preset scanning range, namely acquiring the coil unit, and combining all the coil units within the preset scanning range to obtain a combined coil which is the predicted coil combination. For example, if the preset scanning range is 70cm, the predicted scanning range with a radius of 70cm is obtained by extending the preset scanning range to the periphery by 70cm, then all coil units included in the central range with the radius of 70cm are obtained, and the coil units are combined into a coil combination, which is the predicted coil combination. And after the predicted coil combination is obtained, in order to ensure that the calibration coil of the first imaging sequence is selected, adding the first imaging sequence into the predicted combination coil, and obtaining the calibration coil combination of which the coil combination is a complete scanning of this time. In this embodiment, the position of the coil unit of the scanning device and the preset scanning range are used for prediction to obtain a calibration coil unit which may be needed by a subsequent imaging sequence, so that the calibration data of the calibration coil can be directly used after the imaging data is obtained by scanning the subsequent imaging sequence, and a new calibration coil does not need to be determined again.
In one embodiment, since a series of scans is required for a scan site, there will be adjustments in the sagittal, coronal, and transverse planes. Therefore, in the present embodiment, the imaging sequence set includes three imaging sequences, namely, a first imaging sequence, a second imaging sequence, and a third imaging sequence. The first imaging sequence, the second imaging sequence and the third imaging sequence correspond to different tangent planes respectively, and the tangent planes are a transverse plane, a sagittal plane and a coronal plane respectively. That is, the three imaging sequences correspond to a slice plane in the transverse, sagittal, and coronal planes, respectively, and are not repeatable. For example, the first imaging sequence corresponds to a transverse plane, the second imaging sequence corresponds to a sagittal plane, and the third imaging sequence corresponds to a coronal plane.
In one embodiment, the detailed explanation is given by taking the scanning site as the head and neck, and specifically includes: when the scanning scene is head and neck scanning, a head coil and a spine coil are needed. The set of imaging sequences in the scanning protocol includes a first imaging sequence, a second imaging sequence, and a third imaging sequence. Wherein the first imaging sequence corresponds to a transverse plane, the second imaging sequence corresponds to a sagittal plane, and the third imaging sequence corresponds to a coronal plane.
In particular, the coil units HU1, HU2, HL1, HL2 are comprised as determined from the first imaging sequence, i.e. the coil units HU1, HU2, HL1, HL2 are comprised in the first imaging coil combination. The second imaging sequence further comprises coil units NU, NL, and the third imaging sequence further comprises coil units NU, NL, SP1, predicted from the position of the coil units of the scanning device and the preset scanning range. That is, the predicted coil units NU, NL, SP1 are included in the predicted coil combination, that is, the coil units NU, NL, SP1 are included in the predicted coil combination. Then, the coil units in the first imaging coil assembly and the prediction coil assembly are combined into a calibration coil assembly including the coil units of HU1, HU2, HL1, HL2, NU, NL, SP1, and a calibration scan is performed using the calibration coil assembly.
And when the clinical imaging scanning is completed according to the first imaging sequence, obtaining imaging data corresponding to the first imaging sequence. Because the first imaging sequence has no preamble imaging sequence, according to the coil combination HU1, HU2, HL1 and HL2 corresponding to the first imaging sequence, the calibration coil units determined from the calibration coil combination are HU1, HU2, HL1 and HL2, the calibration data in the coil channels corresponding to the four calibration coil units HU1, HU2, HL1 and HL2 are obtained, the sensitivity distribution information is calculated according to the calibration data, and the image uniformity of the imaging data corresponding to the first imaging sequence is calibrated according to the sensitivity distribution information. And when the clinical imaging scanning is completed according to the second imaging sequence, the imaging data corresponding to the second imaging sequence is obtained. The second imaging sequence has a preceding clinical protocol, the first imaging sequence. That is, whether the imaging data of the second imaging sequence can be multiplexed with the sensitivity distribution information of the imaging data corresponding to the first imaging sequence can be judged according to the imaging coil combination corresponding to the first imaging sequence and the imaging coil combination corresponding to the second imaging sequence. If the imaging coil combination of the second imaging sequence is consistent with the imaging coil combination in the first imaging sequence, the sensitivity distribution information of the imaging data corresponding to the first imaging sequence can be directly multiplexed, and the calibration data does not need to be extracted again for sensitivity calculation. And if the imaging coil combination corresponding to the second imaging sequence is not consistent with the imaging coil combination in the first imaging sequence, extracting corresponding calibration data from the calibration data to calculate sensitivity distribution information according to the imaging coil combinations HU1, HU2, HL1, HL2, NU and NL corresponding to the second imaging sequence. The same method is adopted after the third imaging sequence completes the clinical imaging data scanning, and the details are not repeated here.
It should be understood that although the various steps in the flow charts of fig. 1-3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-3 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in figure 4, there is provided a magnetic resonance scanning apparatus comprising: a determination module 402, a prediction module 404, a control module 406, a calibration module 408, and a reconstruction module 410, wherein:
a determining module 402, configured to determine a scan protocol according to the received scan instruction, where the scan protocol includes a calibration sequence and an imaging sequence set.
The determining module 402 is further configured to determine a first imaging coil combination from a first imaging sequence of the set of imaging sequences.
And a predicting module 404, configured to determine a calibration coil combination corresponding to the calibration sequence according to the position of the coil unit in the magnetic resonance scanning apparatus and a preset scanning range, where the calibration coil combination includes the first imaging coil combination.
And the control module 406 is configured to obtain calibration data based on the calibration sequence and the corresponding calibration coil combination, and obtain imaging data based on each imaging sequence in the imaging sequence set and the imaging coil combination corresponding to each imaging sequence.
The calibration module 408 is configured to calibrate imaging data corresponding to each imaging sequence in the imaging sequence set according to the calibration coil.
And the reconstruction module 410 is configured to perform correction scanning according to the correction coil combination to obtain an image with uniform correction.
In one embodiment, the calibration module 408 is further configured to extract calibration data corresponding to the imaging data from the calibration data according to the coil combination corresponding to the imaging data; and calibrating the imaging data by using calibration data corresponding to the imaging data.
In one embodiment, the calibration module 408 is further configured to perform sensitivity calculation according to calibration data corresponding to the imaging data to obtain sensitivity distribution information; the imaging data is calibrated based on the sensitivity distribution information.
In one embodiment, the calibration module 408 is further configured to use the reusable sensitivity profile information as calibration data corresponding to the imaging data when it is determined that reusable sensitivity profile information exists in the imaging data according to the coil combination corresponding to the imaging data.
In one embodiment, the determining module 402 is further configured to combine the coil units within the preset scanning range when the positions of the coil units in the magnetic resonance scanning apparatus are within the preset scanning range, so as to obtain a predicted coil combination; and adding the first imaging coil combination into the predicting coil combination to obtain a calibration coil combination corresponding to the calibration sequence.
In one embodiment, the control module 406 is further configured to control the magnetic resonance scanning apparatus to excite a calibration sequence to perform calibration scanning, and acquire calibration data obtained by the calibration scanning by using a calibration coil combination corresponding to the calibration sequence; and sequentially controlling the magnetic resonance scanning equipment to excite each imaging sequence in the imaging sequence set to perform imaging scanning, and acquiring imaging data obtained by the imaging scanning by using the imaging coil combination corresponding to the imaging sequence.
For specific definitions of the magnetic resonance scanner, reference may be made to the above definitions of the magnetic resonance scanning method, which are not further described here. The modules in the magnetic resonance scanning apparatus can be implemented in whole or in part by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, the internal structure of which may be as shown in fig. 5. The computer device comprises a processor, a memory, a network interface, a database, a display screen and an input device which are connected through a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing data. 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 magnetic resonance scanning method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 5 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
determining a scanning protocol according to the received scanning instruction, wherein the scanning protocol comprises a calibration sequence and an imaging sequence set;
determining a first imaging coil combination according to a first imaging sequence in the set of imaging sequences;
determining a calibration coil combination corresponding to a calibration sequence according to the position of a coil unit in the magnetic resonance scanning equipment and a preset scanning range, wherein the calibration coil combination comprises a first imaging coil combination;
obtaining calibration data based on the calibration sequence and the corresponding calibration coil combination, and obtaining imaging data based on each imaging sequence in the imaging sequence set and the imaging coil combination corresponding to each imaging sequence;
calibrating imaging data corresponding to each imaging sequence in the imaging sequence set according to the calibration coil;
and carrying out correction scanning according to the correction coil combination to obtain an image with uniform correction.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
extracting calibration data corresponding to the imaging data from the calibration data according to the coil combination corresponding to the imaging data; and calibrating the imaging data by using calibration data corresponding to the imaging data.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
carrying out sensitivity calculation according to calibration data corresponding to the imaging data to obtain sensitivity distribution information;
the imaging data is calibrated based on the sensitivity distribution information.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and when determining that the imaging data has reusable sensitivity distribution information according to the coil combination corresponding to the imaging data, taking the reusable sensitivity distribution information as calibration data corresponding to the imaging data.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
when the position of a coil unit in the magnetic resonance scanning equipment is within a preset scanning range, combining the coil units within the preset scanning range to obtain a predicted coil combination; and adding the first imaging coil combination into the predicting coil combination to obtain a calibration coil combination corresponding to the calibration sequence.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
controlling the magnetic resonance scanning equipment to excite a calibration sequence to carry out calibration scanning, and acquiring calibration data obtained by the calibration scanning by using a calibration coil combination corresponding to the calibration sequence; and sequentially controlling the magnetic resonance scanning equipment to excite each imaging sequence in the imaging sequence set to perform imaging scanning, and acquiring imaging data obtained by the imaging scanning by using the imaging coil combination corresponding to the imaging sequence.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
determining a scanning protocol according to the received scanning instruction, wherein the scanning protocol comprises a calibration sequence and an imaging sequence set;
determining a first imaging coil combination according to a first imaging sequence in the set of imaging sequences;
determining a calibration coil combination corresponding to a calibration sequence according to the position of a coil unit in the magnetic resonance scanning equipment and a preset scanning range, wherein the calibration coil combination comprises a first imaging coil combination;
obtaining calibration data based on the calibration sequence and the corresponding calibration coil combination, and obtaining imaging data based on each imaging sequence in the imaging sequence set and the imaging coil combination corresponding to each imaging sequence;
calibrating imaging data corresponding to each imaging sequence in the imaging sequence set according to the calibration coil;
and carrying out correction scanning according to the correction coil combination to obtain an image with uniform correction.
In one embodiment, the computer program when executed by the processor further performs the steps of:
extracting calibration data corresponding to the imaging data from the calibration data according to the coil combination corresponding to the imaging data; and calibrating the imaging data by using calibration data corresponding to the imaging data.
In one embodiment, the computer program when executed by the processor further performs the steps of:
carrying out sensitivity calculation according to calibration data corresponding to the imaging data to obtain sensitivity distribution information;
the imaging data is calibrated based on the sensitivity distribution information.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and when determining that the imaging data has reusable sensitivity distribution information according to the coil combination corresponding to the imaging data, taking the reusable sensitivity distribution information as calibration data corresponding to the imaging data.
In one embodiment, the computer program when executed by the processor further performs the steps of:
when the position of a coil unit in the magnetic resonance scanning equipment is within a preset scanning range, combining the coil units within the preset scanning range to obtain a predicted coil combination; and adding the first imaging coil combination into the predicting coil combination to obtain a calibration coil combination corresponding to the calibration sequence.
In one embodiment, the computer program when executed by the processor further performs the steps of:
controlling the magnetic resonance scanning equipment to excite a calibration sequence to carry out calibration scanning, and acquiring calibration data obtained by the calibration scanning by using a calibration coil combination corresponding to the calibration sequence; and sequentially controlling the magnetic resonance scanning equipment to excite each imaging sequence in the imaging sequence set to perform imaging scanning, and acquiring imaging data obtained by the imaging scanning by using the imaging coil combination corresponding to the imaging sequence.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A magnetic resonance scanning method, the method comprising:
determining a scanning protocol according to the received scanning instruction, wherein the scanning protocol comprises a calibration sequence and an imaging sequence set;
determining a first imaging coil combination from a first imaging sequence of the set of imaging sequences;
determining a calibration coil combination corresponding to the calibration sequence according to the position of a coil unit in the magnetic resonance scanning equipment and a preset scanning range, wherein the calibration coil combination comprises the first imaging coil combination;
obtaining calibration data based on the calibration sequence and the corresponding calibration coil combination, and obtaining imaging data based on each imaging sequence in the imaging sequence set and the imaging coil combination corresponding to each imaging sequence;
calibrating the imaging data corresponding to each imaging sequence in the imaging sequence set according to the calibration data;
and reconstructing the calibrated imaging data to obtain a calibrated magnetic resonance image.
2. The method of claim 1, wherein the step of calibrating the imaging data corresponding to each imaging sequence in the set of imaging sequences based on the calibration data comprises:
extracting calibration data corresponding to the imaging data from the calibration data according to the coil combination corresponding to the imaging data;
and calibrating the imaging data by utilizing calibration data corresponding to the imaging data.
3. The method of claim 2, wherein the step of calibrating the imaging data using calibration data corresponding to the imaging data comprises:
carrying out sensitivity calculation according to calibration data corresponding to the imaging data to obtain sensitivity distribution information;
and calibrating the imaging data according to the sensitivity distribution information.
4. The method of claim 2, wherein when reusable sensitivity profile information is determined to exist in the imaging data according to the coil combination corresponding to the imaging data, the reusable sensitivity profile information is used as calibration data corresponding to the imaging data.
5. The method according to claim 1, wherein the step of determining a calibration coil combination corresponding to the calibration sequence according to the position of the coil unit in the magnetic resonance scanning apparatus and the preset scanning range, the calibration coil combination including the first imaging coil combination, comprises:
when the position of a coil unit in the magnetic resonance scanning equipment is within the preset scanning range, combining the coil units within the preset scanning range to obtain a predicted coil combination;
and adding the first imaging coil combination into the predicting coil combination to obtain a calibration coil combination corresponding to the calibration sequence.
6. The method of claim 1, wherein the set of imaging sequences comprises a first imaging sequence and a second imaging sequence;
the first imaging sequence and the second imaging sequence respectively correspond to different sections of the same scanning part;
or the first imaging sequence and the second imaging sequence correspond to the same section of the same scanning part, and the scanning ranges corresponding to the first imaging sequence and the second imaging sequence are different;
the cut plane includes at least one of a transverse plane, a sagittal plane, and a coronal plane.
7. The method of claim 1, wherein the step of deriving calibration data based on the calibration sequence and the corresponding calibration coil combination, and deriving imaging data based on each imaging sequence in the set of imaging sequences and the corresponding imaging coil combination of each imaging sequence comprises:
controlling the magnetic resonance scanning equipment to excite the calibration sequence to carry out calibration scanning, and collecting calibration data obtained by calibration scanning by using a calibration coil combination corresponding to the calibration sequence;
and sequentially controlling the magnetic resonance scanning equipment to excite each imaging sequence in the imaging sequence set to carry out imaging scanning, and acquiring imaging data obtained by the imaging scanning by using the imaging coil combination corresponding to the imaging sequence.
8. An apparatus for magnetic resonance scanning, the apparatus comprising:
the determining module is used for determining a scanning protocol according to the received scanning instruction, wherein the scanning protocol comprises a calibration sequence and an imaging sequence set;
the determining module is further configured to determine a first imaging coil combination according to a first imaging sequence in the set of imaging sequences;
the prediction module is used for determining a calibration coil combination corresponding to the calibration sequence according to the position of a coil unit in the magnetic resonance scanning equipment and a preset scanning range, wherein the calibration coil combination comprises the first imaging coil combination;
the control module is used for obtaining calibration data based on the calibration sequence and the corresponding calibration coil combination, and obtaining imaging data based on each imaging sequence in the imaging sequence set and the imaging coil combination corresponding to each imaging sequence;
the calibration module is used for calibrating the imaging data corresponding to each imaging sequence in the imaging sequence set according to the calibration data;
and the reconstruction module is used for reconstructing the calibrated imaging data to obtain a calibrated magnetic resonance image.
9. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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| CN112731222B (en) * | 2020-12-28 | 2022-09-27 | 上海联影医疗科技股份有限公司 | Detection equipment calibration method and device, computer equipment and storage medium |
| CN114285909B (en) * | 2021-12-21 | 2023-09-05 | 武汉联影生命科学仪器有限公司 | Scanning method, device, system, computer device and medium for magnetic resonance equipment |
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