JP2011143032A - Magnetic resonance imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress extension of a raw data collection unit by improving the efficiency of the execution of processing. <P>SOLUTION: The MRI (Magnetic Resonance Imaging) apparatus 100 includes the raw data collection unit 10. On the raw data collection unit 10, a buffer memory board for storing the raw data of MRI echo signals and performing correction processing on the stored raw data is loaded. Further, the raw data collection unit 10 acquires the raw data having been corrected by the buffer memory board from the buffer memory board, and collects the acquired raw data. Further, the MRI apparatus 100 includes an image reconstruction unit 12. The image reconstruction unit 12 acquires the raw data collected by the raw data collection unit 10 from the raw data collection unit 10 and reconstructs images using the acquired raw data. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a magnetic resonance imaging apparatus.

  Conventionally, in a magnetic resonance imaging apparatus (hereinafter referred to as an MRI (Magnetic Resonance Imaging) apparatus), a raw data collection unit collects raw data of an MRI echo signal, and an image reconstruction unit is collected by the raw data collection unit. An image is reconstructed using the raw data (for example, Patent Document 1).

  FIG. 8 is a diagram for explaining the prior art. For example, when collecting raw data of a plurality of channels, a conventional MRI apparatus includes a plurality of raw data collection units. This is because there is a limit to the processing that can be executed by one raw data collection unit, and the number of channels that can be collected by one raw data collection unit is limited. For example, when collecting raw data for 32 channels in a certain imaging, the MRI apparatus includes, for example, four raw data collection units (# 1 to # 4) as illustrated in FIG. The unit collects raw data for every 8 channels, thereby collecting a total of 32 channels of raw data. In FIG. 8, a black straight arrow indicates a flow of raw data from the raw data collection unit to the image reconstruction unit, and a white straight arrow indicates a flow of image from the image reconstruction unit to the host computer.

JP 2007-185250 A

  Here, in the above-described conventional technology, for example, if there is a change in the items required for imaging, such as an increase in the number of channels, it has been necessary to deal with it by adding a raw data collection unit. This is because there is a limit to the processing that can be executed by one raw data collection unit. However, the addition of the raw data collection unit is not desirable from the viewpoints of space saving, power saving, and cost.

  The present invention has been made in view of the above, and an object of the present invention is to provide a magnetic resonance imaging apparatus that can efficiently execute processing and suppress the addition of a raw data collection unit.

  In order to solve the above-described problems and achieve the object, a magnetic resonance imaging apparatus according to claim 1 accumulates raw data of a magnetic resonance imaging echo signal, and performs a correction process on the accumulated raw data; The raw data corrected by the storage unit is acquired from the storage unit, the raw data collection unit collecting the acquired raw data, and the raw data collected by the raw data collection unit And an image reconstruction unit that reconstructs an image using the obtained raw data.

  According to the magnetic resonance imaging apparatus of the first aspect, it is possible to increase the efficiency of the process execution and to suppress the addition of the raw data collection unit.

FIG. 1 is a block diagram illustrating the configuration of the MRI apparatus 100 according to the first embodiment. FIG. 2 is a block diagram illustrating a configuration of the raw data collection unit 10. FIG. 3 is a block diagram illustrating a configuration of the raw data collection unit 10. FIG. 4 is a diagram for explaining transfer of raw data from the buffer memory board memory to the raw data collecting unit memory. FIG. 5 is a diagram for explaining an execution mode of the correction process. FIG. 6 is a diagram for explaining rearrangement of raw data in the raw data collection unit 10. FIG. 7 is a diagram for explaining transfer control in the raw data collection unit 10. FIG. 8 is a diagram for explaining the prior art.

  Hereinafter, embodiments of the MRI apparatus according to the present invention will be described in detail. In addition, this invention is not limited by the following examples.

[Configuration of MRI Apparatus According to Embodiment 1]
The configuration of the MRI apparatus 100 according to the first embodiment will be described with reference to FIG. FIG. 1 is a block diagram illustrating the configuration of the MRI apparatus 100 according to the first embodiment. As illustrated in FIG. 1, the MRI apparatus 100 according to the first embodiment particularly includes a static magnetic field magnet 1, a gradient magnetic field coil 2, a gradient magnetic field power supply 3, a bed 4, a transmission coil 5, and a reception coil 6. A transmission unit 7, a reception unit 8, a real-time sequencer 9, a raw data collection unit 10, an image reconstruction unit 12, and a host computer 20.

  The static magnetic field magnet 1 is formed in a hollow cylindrical shape and generates a uniform static magnetic field in an internal space. The static magnetic field magnet 1 is, for example, a permanent magnet or a superconducting magnet. The gradient coil 2 is formed in a hollow cylindrical shape and generates a gradient magnetic field in the internal space. Specifically, the gradient magnetic field coil 2 is arranged inside the static magnetic field magnet 1 and receives a current supplied from the gradient magnetic field power supply 3 to generate a gradient magnetic field. The gradient magnetic field power supply 3 supplies a current to the gradient magnetic field coil 2 in accordance with the pulse sequence execution data sent from the real-time sequencer 9.

  The bed 4 includes a top plate 4a on which the subject P is placed, and the top plate 4a is inserted into the cavity (imaging port) of the gradient magnetic field coil 2 with the subject P placed thereon. Usually, the bed 4 is installed such that the longitudinal direction is parallel to the central axis of the static magnetic field magnet 1.

  The transmission coil 5 generates a high frequency magnetic field. Specifically, the transmission coil 5 is arranged inside the gradient magnetic field coil 2 and receives a high frequency pulse from the transmission unit 7 to generate a high frequency magnetic field. The transmission unit 7 transmits a high-frequency pulse corresponding to the Larmor frequency to the transmission coil 5 in accordance with the pulse sequence execution data transmitted from the real-time sequencer 9.

  The receiving coil 6 receives the MRI echo signal. Specifically, the receiving coil 6 is arranged inside the gradient magnetic field coil 2 and receives an MRI echo signal radiated from the subject P due to the influence of the high-frequency magnetic field. The receiving coil 6 outputs the received MRI echo signal to the receiving unit 8. For example, the receiving coil 6 is a receiving coil for the head, a receiving coil for the spine, a receiving coil for the abdomen, or the like.

  The receiving unit 8 generates MRI echo signal data based on the MRI echo signal output from the receiving coil 6 in accordance with the pulse sequence execution data sent from the real-time sequencer 9. Specifically, the receiving unit 8 generates MRI echo signal data by digitally converting the MRI echo signal output from the receiving coil 6, and transmits the generated MRI echo signal data to the raw data collecting unit 10.

  The real-time sequencer 9 is connected to the gradient magnetic field power supply 3, the transmission unit 7 and the reception unit 8, and controls input / output of data transmitted / received between the connected units and the host computer 20. The raw data collection unit 10 collects MRI echo signal data transmitted from the reception unit 8. When the raw data collection unit 10 collects the MRI echo signal data, the raw data collection unit 10 transmits the collected MRI echo signal data to the image reconstruction unit 12. The raw data collection unit 10 will be described in detail later. The image reconstruction unit 12 reconstructs image data from the MRI echo signal data transmitted from the raw data collection unit 10 and stores the reconstructed image data in the storage unit 21 of the host computer 20.

  In particular, the host computer 20 includes a storage unit 21, a control unit 22, an input unit 23, and a display unit 24. The storage unit 21 stores the image data stored by the image reconstruction unit 12. For example, the storage unit 21 is a semiconductor memory device such as a RAM (Random Access Memory) or a flash memory, a hard disk, an optical disk, or the like.

  The control unit 22 comprehensively controls the MRI apparatus 100 by controlling the above-described units. For example, the control unit 22 is an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array), or an electronic circuit such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit).

  The input unit 23 receives an imaging instruction and the like from the operator. For example, the input unit 23 is a pointing device such as a mouse or a trackball, a selection device such as a mode switch, or an input device such as a keyboard. The display unit 24 displays image data and the like. For example, the display unit 24 is a display device such as a liquid crystal display.

[Raw data collection unit]
Next, the raw data collection unit 10 will be described in detail with reference to FIGS. 2 and 3 are block diagrams illustrating the configuration of the raw data collection unit 10.

  First, as illustrated in FIG. 2, the MRI apparatus 100 according to the first embodiment includes two raw data collection units 10. Specifically, the MRI apparatus 100 includes a raw data collection unit 10-1 and a raw data collection unit 10-2. The raw data collection unit 10-1 includes a buffer memory board 11-1 and a buffer memory board 11-2. Similarly, the raw data collection unit 10-2 includes a buffer memory board 11-3 and a buffer memory board 11-4.

  In the following description, the two raw data collection units are collectively referred to as “raw data collection unit 10”, and when each raw data collection unit is distinguished, “raw data collection unit 10-1”. Alternatively, it is referred to as “raw data collection unit 10-2”. The two buffer memory boards are collectively referred to as “buffer memory board 11”, and when distinguishing each buffer memory board, “buffer memory board 11-1” or “buffer memory board 11-2” is used. " 2 shows an example in which the MRI apparatus 100 includes two raw data collection units 10 and each of the raw data collection units 10 includes two buffer memory substrates 11. However, the present invention is limited to this. It is not a thing. The number of raw data collection units 10 and the number of buffer memory substrates 11 provided in each of the raw data collection units 10 can be arbitrarily changed according to imaging conditions and the like.

  As illustrated in FIG. 3, for example, the raw data collection unit 10-1 includes a raw data collection unit memory 10-1a, a buffer memory substrate 11-1, and a buffer memory substrate 11-2. For example, the buffer memory board 11-1 includes a logic circuit 11-1a, a logical expression memory 11-1b, a buffer memory board memory 11-1c, and an interface 11-1d.

  Here, when the raw data of the MRI echo signal is received via the interface 11-1d, the buffer memory board 11-1 accumulates the received raw data in the buffer memory board memory 11-1c. Further, the buffer memory board 11-1 performs correction processing on the raw data stored in the buffer memory board memory 11-1c for each point. The correction process is, for example, an averaging process for raw data, a phase correction process or the like (such as a correction process for raw data of complex integers or complex floating-point numbers), and is executed by the logic circuit 11-1a. For example, when 512 points of pixels are included in one line of raw data collected by one echo, the logic circuit 11-1a performs correction processing one point at a time.

  Here, the logic circuit 11-1a is a logic circuit that executes a preset operation. The logical memory 11-1b is a nonvolatile memory capable of rewriting information. In other words, the logic circuit 11-1a performs an operation according to the logical expression stored in the logical expression memory 11-1b, and performs correction processing.

  For example, in the first embodiment, the logic circuit 11-1a is an FPGA (Field Programmable Gate Array). However, the logic circuit 11 of the present invention is not limited to the FPGA, and may be another logic circuit capable of rewriting the logical expression. Further, rewriting of the logical expression is not necessarily required, and a logic circuit that executes a fixedly set operation may be used.

  Next, transfer of raw data from the buffer memory board memory 11-1c to the raw data collecting unit memory 10-1a will be described with reference to FIG. FIG. 4 is a diagram for explaining transfer of raw data from the buffer memory board memory to the raw data collecting unit memory.

  As illustrated in FIG. 4, the buffer memory board memory 11-1c according to the first embodiment transfers raw data to the raw data collection unit memory 10-1a line by line. Here, the raw data transferred from the buffer memory board memory 11-1c to the raw data collecting unit memory 10-1a is obtained by performing correction processing by the logic circuit 11-1a. That is, the raw data collection unit 10-1 acquires the raw data that has been corrected by the buffer memory board 11-1 line by line from the buffer memory board memory 11-1c.

  Incidentally, the buffer memory substrate 11 in the first embodiment can select whether or not to perform the correction process. For example, the host computer 20 in the first embodiment transmits an instruction regarding the execution mode of the correction process to the raw data collection unit 10 together with the imaging conditions and the like. For example, when high-speed imaging such as EPI (Echo planar imaging) imaging is performed, the host computer 20 transmits an instruction not to execute correction processing. On the other hand, when normal imaging is performed, the host computer 20 transmits an instruction to execute correction processing.

  FIG. 5 is a diagram for explaining an execution mode of the correction process. As illustrated in FIG. 5, the raw data collection unit 10 determines the correction processing execution mode based on the instruction transmitted from the host computer 20 (step S101), and if the instruction is the correction processing execution mode (step S102). ), The buffer memory board 11 is notified that the correction process should be executed (step S103). On the other hand, if it is an instruction for the correction processing non-execution mode (step S104), the raw data collection unit 10 notifies the buffer memory board 11 that the correction processing should not be executed (step S105). Then, the buffer memory board memory 11 selects whether to execute the correction process according to the notification received from the raw data collection unit 10.

  Note that the host computer 20 does not necessarily need to send an instruction regarding the execution mode of the correction process to the raw data collection unit 10. For example, the raw data collection unit 10 is based on the imaging conditions received from the host computer 20. It may be determined whether or not to execute the correction process, and based on the determination result, an instruction as to whether or not to execute the correction process may be notified to the buffer memory board memory 11-1c. Since the raw data collection unit 10 according to the first embodiment can perform other processes as much as the load of the correction process is reduced, for example, it may be determined whether or not to execute the correction process. .

  By the way, as illustrated in FIG. 2, in the raw data collection unit 10 according to the first embodiment, one raw data collection unit collects raw data for 16 channels, for example. Compared with the fact that the conventional raw data collection unit described with reference to FIG. 8 collects raw data for eight channels, the raw data collection unit 10 according to the first embodiment can perform more processing. It will be. This point will be described.

  The reason why the number of processes that can be executed in the raw data collection unit 10 is increased is that the buffer memory substrate 11 is subjected to the correction process. As described with reference to FIG. 3, for example, the buffer memory board 11-1 is a board on which a logic circuit 11-1a for executing a preset operation is arranged, and the logic circuit 11-1a is corrected. Execute the process. Since such a logic circuit 11-1a is a method of executing a preset operation every clock, the processing becomes faster and the processing time can be predicted. Therefore, the correction processing by the logic circuit 11-1a can be performed at high speed and the processing time can be predicted.

  On the other hand, if the CPU of the raw data collection unit 10 executes the correction process, the CPU does not simply execute a preset operation, but also executes, for example, an unexpected interrupt process. Even when the clocks are compared, the CPU clock is much slower than the clock of the logic circuit 11-1a. For this reason, the correction process by the raw data collection unit 10 is slow and it is impossible to predict the processing time.

  If so, as in the first embodiment, the buffer memory substrate 11 performs correction processing at high speed, and the raw data collection unit 10 acquires the raw data subjected to the correction processing from the buffer memory substrate 11. In this case, the correction process is not only accelerated, but the processing load on the raw data collection unit 10 should be reduced at least by the correction process. As a result, the raw data collection unit 10 can efficiently perform other processes that have been performed so far, and can also perform other processes that have not been performed so far.

  Then, the process which came to be performed efficiently by the raw data collection part 10, or the other process which has not been performed until now is demonstrated. First, the process that has been efficiently performed by the raw data collection unit 10 includes a rearrangement process of raw data.

  The rearrangement process will be described. The raw data collection unit 10 stores the MRI echo signal data in the k space of the raw data collection unit memory 10-1a. Here, the MRI echo signal data is reconstructed into an image by being Fourier transformed by the image reconstruction unit 12. An area for temporarily storing MRI echo signal data for the Fourier transform is k-space. Specifically, the k space is represented by a matrix of frequency encoding × phase encoding. For example, when the frequency encoding is “512 points”, the k space has 512 columns. That is, the raw data collection unit 10 collects MRI echo signal data for one line in k space in one sequence. The raw data collection unit 10 collects MRI echo signal data of different lines by changing the phase encoding gradient every time the sequence is repeated.

  By the way, in multi-slice imaging, the raw data collection unit 10 collects MRI echo signal data of a plurality of slices in one sequence. For example, when TR (Repetition Time) of a sequence is 600 milliseconds, it takes 30 milliseconds to excite one slice and collect MRI echo signal data. In this case, a waiting time of 570 milliseconds will occur before the slice is excited in the next sequence. In this regard, in multi-slice imaging, during the waiting time, other slices are excited and MRI echo signal data is collected. Eventually, the raw data collection unit 10 collects MRI echo signal data for one line in k space for a plurality of slices in one sequence.

  For example, as illustrated in FIG. 6, a 4-slice multi-slice imaging is assumed. Each slice is assumed to have a frequency encoding of “512 points” and a phase encoding of “9 echoes”. In this case, the order in which the raw data collection unit 10 stores the raw data in the k space is, for example, “first row of slice 1”, “first row of slice 2”, “slice” as illustrated in FIG. 3 in the first row ”,“ the first row in the slice 4 ”,“ the second row in the slice 1 ”, and so on.

  Therefore, as illustrated in FIG. 6, the raw data collection unit 10 associates information for identifying a slice with the order in which the MRI echo signal data stored in the slice is collected by the raw data collection unit 10. The rearrangement table is stored in advance. For example, the k-space of “slice 1” indicates that the MRI echo signal data collected in “first, fifth, ninth,..., 33rd” is stored. Then, the raw data collection unit 10 rearranges the MRI echo signal data according to the rearrangement table and stores it in the k space for each slice.

  Here, since the raw data collection unit 10 receives the corrected MRI echo signal data line by line from the buffer memory substrate 11, the raw data collection unit memory 10 receives the MRI echo signal data received from the buffer memory substrate 11. When storing in -1a, it rearranges according to a rearrangement table, and stores in k space for every slice. If the MRI echo signal data received from the buffer memory board 11 is not corrected, the raw data collection unit 10 further includes another buffer memory, and temporarily stores the MRI echo signal data in the buffer memory. Then, the accumulated MRI echo signal data must be corrected point by point, rearranged according to the rearrangement table, and stored in the raw data collection unit memory 10-1a. Thus, the raw data collection unit 10 according to the first embodiment can efficiently perform the rearrangement process.

  Next, another process that the raw data collection unit 10 has not performed so far will be described. As described above, if the correction process is not performed by the buffer memory substrate 11, the raw data collection unit 10 must perform the correction process. In this case, the number of processes that the raw data collection unit 10 has to execute increases and the load increases, so that the process by the raw data collection unit 10 has a limit.

  In this regard, the raw data collection unit 10 according to the first embodiment can further perform processing for controlling transfer or non-transfer of raw data to the image reconstruction unit 12. For example, the raw data collection unit 10 receives information for determining whether or not the raw data is necessary for image reconstruction from the host computer 20 in advance, and based on this information, the raw data collection unit 10 sends the information to the image reconstruction unit 12. Controls whether raw data is transferred.

  Here, various information can be considered as information for determining whether or not the raw data is necessary for image reconstruction. For example, in the imaging by the MRI apparatus 100, imaging for selecting a coil used for imaging may be performed before the main imaging. In such a case, even if a plurality of coils are connected to the MRI apparatus 100, only a part of the coils may be used for the main imaging. In such a situation, information collected from some coils is only information equivalent to noise.

  In such a case, for example, before the main imaging, the host computer 20 informs the raw data collection unit 10 in advance about information on the selected coil (for example, the channel corresponding to the selected coil, the coil not selected). Channel). Then, the raw data collection unit 10 performs, for example, the determination illustrated in FIG. 7 and controls whether or not to transfer the raw data to the image reconstruction unit 12.

  FIG. 7 is a diagram for explaining transfer control in the raw data collection unit 10. For example, when the raw data collection unit 10 receives raw data for one line from the buffer memory board 11 (step S201), the received raw data is a channel corresponding to a coil that is not selected (hereinafter, a non-selected channel). It is determined whether or not (step S202).

  If the channel is a non-selected channel (Yes at Step S202), the raw data collection unit 10 controls not to transfer the raw data to the image reconstruction unit 12 (Step S203). On the other hand, when the channel is not a non-selected channel (No at Step S202), the raw data collection unit 10 controls to transfer the raw data to the image reconstruction unit 12 (Step S204). Thereafter, the raw data collection unit 10 determines whether or not the collection of the raw data has been completed (step S205), and when it has been completed (Yes in step S205), the process ends.

  It should be noted that other examples can be considered as information for determining whether or not the raw data is necessary for image reconstruction. For example, based on the imaging conditions, for example, when it is previously determined that 4 out of 32 channels are unnecessary for image reconstruction, information for identifying the 4 channels may be used. Alternatively, for example, when the collection unit of MRI echo signal data is 8 channels, when using a 7-channel coil, a 5-channel coil, etc., the other 1 channel or 3 channel is an unnecessary channel. Should be known in advance. In such a case, information such as using a 7-channel or 5-channel coil may be used.

[Effect of Example 1]
As described above, the MRI apparatus 100 according to the first embodiment includes the buffer memory substrate 11 that accumulates raw data of the MRI echo signal and performs a correction process on the accumulated raw data. In addition, the MRI apparatus 100 includes a raw data collection unit 10 that acquires raw data that has been corrected by the buffer memory substrate 11 from the buffer memory substrate 11 and collects the acquired raw data. The MRI apparatus 100 also includes an image reconstruction unit 12 that acquires the raw data collected by the raw data collection unit 10 from the raw data collection unit 10 and reconstructs an image using the obtained raw data.

  For this reason, according to the first embodiment, the processing load of the raw data collection unit 10 is reduced by at least the correction process, so that the execution of the processing by the raw data collection unit 10 is made efficient and the raw data collection is performed. It becomes possible to suppress the addition of the unit 10. If the increase of the raw data collection unit 10 can be suppressed, it is desirable from the viewpoints of space saving, power saving, and cost.

  That is, the raw data collection unit 10 is often installed as one physical casing for one CPU. For this reason, the addition of the raw data collection unit 10 means an addition of a physical casing, which is not desirable from the viewpoint of space saving and power saving. In this respect, it is desirable from the viewpoint of space saving and power saving if the addition of the raw data collecting unit 10 can be suppressed. In general, when the costs of a CPU and, for example, an FPGA are compared, the former is often overwhelmingly expensive compared to the latter. Further, if it is not necessary to perform correction processing in the raw data collection unit 10, it is possible to select a cheaper CPU for the raw data collection unit 10. For this reason, it is desirable from the viewpoint of cost.

  Further, since the raw data collection unit 10 can be equipped with a plurality of buffer memory substrates 11, the number of collection channels can be expanded for each raw data collection unit 10.

  The buffer memory board 11 is a board on which a logic circuit that executes a preset operation is arranged. For this reason, according to the first embodiment, the correction process can be performed at high speed and the processing time can be predicted.

  The buffer memory substrate 11 further includes a logical memory capable of rewriting information, and causes the logical circuit to perform an operation according to the information stored in the logical memory. For this reason, according to the first embodiment, it is possible to reconstruct the processing contents by the logic circuit, so that it is possible to flexibly cope with a case where the processing becomes complicated in the future.

  Further, the buffer memory substrate 11 receives an instruction as to whether or not to perform correction processing, and selects whether or not to perform correction processing on the accumulated raw data in accordance with the received instruction. For this reason, according to the first embodiment, it is possible to appropriately cope with high-speed imaging such as EPI imaging.

  Further, the raw data collection unit 10 determines whether or not the raw data acquired from the buffer memory substrate 11 is raw data including information used for reconstruction. If the raw data collection unit 10 determines that the raw data includes information used for reconstruction, the raw data collection unit 10 performs control so that the acquired raw data is transferred to the image reconstruction unit 12. When it is determined that the raw data does not include the information to be used, control is performed so that the acquired raw data is not transferred to the image reconstruction unit 12. For this reason, according to the first embodiment, raw data unnecessary for reconstruction processing is not transmitted to the image reconstruction unit 12, and the image reconstruction unit 12 temporarily receives unnecessary raw data, Since there is no need to perform wasteful processing such as discarding after that, it is possible to improve processing efficiency as a whole.

DESCRIPTION OF SYMBOLS 1 Static magnetic field magnet 2 Gradient magnetic field coil 3 Gradient magnetic field power supply 4 Bed 5 Transmission coil 6 Reception coil 7 Transmission part 8 Reception part 9 Real-time sequencer 10 Raw data collection part 11 Buffer memory board 12 Image reconstruction part 20 Host computer 100 MRI apparatus

Claims (5)

An accumulation unit that accumulates raw data of magnetic resonance imaging echo signals and performs correction processing on the accumulated raw data;
A raw data collection unit that acquires raw data that has undergone correction processing by the storage unit from the storage unit and collects the acquired raw data;
A magnetic resonance imaging apparatus comprising: an image reconstruction unit that obtains raw data collected by the raw data collection unit from the raw data collection unit and reconstructs an image using the obtained raw data .   The magnetic resonance imaging apparatus according to claim 1, wherein the storage unit is a substrate on which a logic circuit that executes a preset operation is arranged.   The magnetic resonance imaging apparatus according to claim 2, wherein the storage unit further includes a storage unit capable of rewriting information, and causes the logic circuit to perform an operation in accordance with information stored in the storage unit.   4. The storage unit according to claim 1, wherein the storage unit receives an instruction as to whether or not to perform correction processing, and selects whether or not to perform correction processing on the stored raw data according to the received instruction. The magnetic resonance imaging apparatus according to any one of the above.   The raw data collection unit determines whether the raw data acquired from the storage unit is raw data including information used for reconstruction, and determines that the raw data includes information used for reconstruction In such a case, the obtained raw data is controlled to be transferred to the image reconstruction unit, and when it is determined that the raw data does not include information used for reconstruction, the obtained raw data is The magnetic resonance imaging apparatus according to claim 1, wherein control is performed so as not to transfer the image reconstruction unit.

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