JP4768907B2 - Magnetic resonance imaging apparatus and storage medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic resonance imaging apparatus and a storage medium used therefor.
[0002]
[Prior art]
In recent years, as one of medical devices, a magnetic resonance imaging apparatus (hereinafter referred to as MRI) using magnetic resonance imaging has become widespread. As is well known in magnetic resonance imaging, when a group of magnetized spins of a target nucleus is placed in a magnetic field, it has a specific frequency (resonance frequency) depending on its intrinsic magnetic moment and the strength of the existing magnetic field. This is a technique for acquiring chemical and physical microscopic information of a substance by utilizing a phenomenon that resonates with a rotating high-frequency magnetic field and generates a signal (magnetic resonance signal) in the relaxation process.
In magnetic resonance imaging, the contrast and resolution of an image, the image S / N ratio, or the imaging time, for example, are the type of pulse sequence and its parameters, repetition time (TR), echo time (TE), high frequency for excitation. Depending on the flip angle (FA) of the magnetic field pulse and the like, the MRI requires setting of many imaging conditions such as the slice thickness and the number of matrices, among other medical devices.
Conventionally, these pulse sequence parameters are set to arbitrary values from the experience of the operator, or by selecting appropriate parameter values from typical parameter values built in the device itself, I was setting up.
[0003]
In addition, if the affected area or lesion to be photographed is not unique to the subject and you want to find an abnormal part using a commonly known examination method, there is a typical imaging area unique to that examination method. May exist.
For example, the blood vessels in the head are photographed by the three-dimensional time of flight (3D-TOF) method, and the bile ducts in the abdomen are photographed by the MR Cholangiopancreatography (MRCP) method.
Conventionally, in such an inspection method, the position of the imaging region has been set empirically by searching for images or films of other clinical examples taken in the past and referring to them.
In addition, as described above, the MRI apparatus can obtain images with various contrasts depending on the imaging conditions such as the imaging region and parameters. Therefore, conventionally, the MRI apparatus generally refers to images taken in the past, or We have understood and evaluated MRI images while referring to a collection of paper images representing the positional relationship of each organ called a human atlas with each part imaged.
[0004]
[Problems to be solved by the invention]
However, as described above, unless the parameters of the pulse sequence are set to appropriate values, the contrast, resolution, and S / N ratio necessary for the target diagnosis cannot be obtained, but an inexperienced operator is required. Therefore, it is difficult to imagine what kind of image is actually obtained by setting each parameter.
Further, even when an appropriate parameter value is selected from typical parameter values, it is difficult to know in advance what kind of image is obtained by the selected parameter value.
Furthermore, when it is desired to change some values of the parameters due to reasons such as shortening the shooting time or the size of the shooting target, it is difficult to predict the effect of these changes on the image.
Similarly, in setting the position of the photographing region in each inspection method, it is difficult for an inexperienced operator to predict what kind of image can be obtained by actually setting the position of the photographing region.
In addition, even in a captured image, it is difficult for an operator who is not familiar with an MRI image to understand how each organ is imaged, which may affect the evaluation of the image.
[0005]
Due to the difficulty of setting these parameters, setting the position of the imaging area, or understanding and evaluating the captured image, there are various problems such as longer examination time, lower patient throughput, and increased burden on the subject. It was generated.
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a magnetic resonance imaging apparatus and a storage medium used therefor that solve the above problems, shorten the entire examination time, improve patient throughput, and reduce the burden on the subject.
[0006]
[Means for Solving the Problems]
A first aspect of the present invention relates to a computer-readable storage medium that stores a program for operating a computer, and the program is provided to an operator from a plurality of sample images respectively corresponding to imaging conditions of a magnetic resonance imaging apparatus. A procedure for searching for at least one sample image suitable for the input photographing condition; In order to align the position of the imaging area in the positioning image, Sample image retrieved by the above procedure And the position of the imaging area The positioning image And the position of the imaging area And displaying the image on the image display means in the magnetic resonance imaging apparatus.
[0008]
First of the present invention 2 The aspect of the present invention relates to a computer-readable storage medium storing a program for operating a computer, and the program includes imaging conditions input by an operator from a plurality of sample images respectively corresponding to imaging conditions of a magnetic resonance imaging apparatus. A procedure for retrieving at least one sample image suitable for the photographing condition closest to the image, a procedure for calculating a sample image suitable for the photographing condition from the sample image retrieved by the procedure, and the calculated sample image And a program for displaying the image on the image display means in the magnetic resonance imaging apparatus.
First of the present invention 3 The aspect of the invention relates to a storage medium, and includes a plurality of sample images respectively corresponding to imaging conditions of the magnetic resonance imaging apparatus, and at least one sample image suitable for the imaging conditions input by the operator from the plurality of sample images. The steps to let your computer search, In order to align the position of the imaging area in the positioning image, Sample image retrieved by the above procedure And the position of the imaging area The positioning image And the position of the imaging area And a program for displaying the image on the image display means in the magnetic resonance imaging apparatus.
First of the present invention 4 The aspect of the present invention relates to a magnetic resonance imaging apparatus, and is obtained from the imaging space, a magnetic field generating means for generating a magnetic field in the imaging space, a control means for controlling the magnetic field generating means under imaging conditions input by an operator, and Reconstructing means for reconstructing the image of the subject based on the received signal, sample image storing means for storing the sample image, and from the sample image storing means based on the imaging condition input by the operator. Retrieval means for retrieving a sample image and the retrieved sample image And the position of the imaging area and The reconstructed image And the position of the imaging area And image display means for displaying.
First of the present invention 5 The aspect of the present invention relates to a magnetic resonance imaging apparatus, and is obtained from the imaging space, a magnetic field generating means for generating a magnetic field in the imaging space, a control means for controlling the magnetic field generating means under imaging conditions input by an operator, and Reconstructing means for reconstructing the image of the subject based on the received signal, sample image storing means for storing the sample image, and from the sample image storing means based on the imaging condition input by the operator. Search means for searching for a sample image; means for calculating a sample image that matches the imaging condition from the searched sample image; and at least one of the calculated sample image and the reconstructed image Image display means for displaying.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment according to the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a configuration of MRI according to the present embodiment.
A gantry 1 in which a cylindrical inner space is formed so as to accommodate a subject is equipped with a static magnetic field magnet 3, a gradient magnetic field coil 5, and an RF coil 7, and a system for controlling each device equipped in the gantry 1 is , Gradient magnetic field power source 9, transmission unit 11, reception unit 13, computer system 15, image display 19, sequence controller 17, and console 2.
The static magnetic field magnet 3 generates a static magnetic field inside the cylinder substantially parallel to the Z axis. The Z axis coincides with the longitudinal center line of the cylinder.
The gradient magnetic field coil 5 has an X-axis gradient magnetic field whose magnetic field strength changes linearly along the X-axis, a Y-axis gradient magnetic field whose magnetic field strength changes linearly along the Y-axis, and a magnetic field strength linearly along the Z-axis. The Z-axis gradient magnetic field that changes can be independently generated. The X axis is the horizontal direction, and the Y axis is the vertical direction.
The RF coil 7 generates an excitation high-frequency pulse with a flip angle of, for example, 90 ° for exciting protons in the subject, and an inversion high-frequency pulse with a flip angle of, for example, 180 ° for inverting protons in the subject. Generate a pulse.
[0010]
The gradient magnetic field power source 9 includes an X-axis drive current for generating an X-axis gradient magnetic field from the gradient magnetic field coil 5, a Y-axis drive current for generating a Y-axis gradient magnetic field, and a Z-axis for generating a Z-axis gradient magnetic field. The drive current is configured to be supplied to the gradient magnetic field coil 5 independently.
The transmitter 11 is configured to be able to supply high-frequency currents for generating excitation and inversion high-frequency pulses (hereinafter also referred to as RF pulses) from the RF coil 7, respectively. The RF coil 7 is also used as a receiving coil for receiving echoes generated from protons in the subject.
The receiving unit 13 samples the echo signal received via the RF coil 7, performs A / D conversion, and outputs the digital signal to the computer system 15.
The computer system 15 appropriately corrects the echo signal from the receiving unit 13 and then reconstructs image data by, for example, two-dimensional Fourier transform processing (2DFT). The image data is sent to the image display 19 and visualized.
The sequence controller 17 controls the gradient magnetic field power supply 9, the transmission unit 11, and the reception unit 13 according to the pulse sequence data sent from the computer system 15, and executes the pulse sequence.
[0011]
The console 2 is connected to the computer system 15 and is composed of an input device capable of setting various conditions and inputting commands, such as a keyboard and a mouse.
Here, the computer system 15 will be described in detail. The computer system 15 is used to reconstruct image data as described above. In the present embodiment, in addition to this, the computer system 15 is also used to provide a typical sample image.
FIG. 2 shows a block diagram of a portion of computer system 15 for providing sample images. A block diagram relating to image reconstruction is omitted here.
A system for providing a sample image includes a memory 71 for temporarily storing information, a sample image memory 73 for use in setting parameters, a sample image memory 74 for use in setting an imaging region, and a captured image. Sample image memory 75 used for understanding and evaluating the image, imaging region, sequence type and setting memory 77 in which parameter values corresponding to the sequence type are stored, CPU 72 for controlling these, and these controls The memory 76 stores a program. Each sample image memory and control program storage memory are storage media such as a hard disk, DVD, and CD-ROM. In FIG. 2, each sample image memory, control program storage memory, and setting memory are used. Are individually displayed, but these may be one storage medium.
[0012]
In addition, when each sample image and control program are stored in advance in a hard disk or the like of the apparatus main body at the time of shipment of the apparatus, the operator does not need to perform any installation work, but the apparatus main body to which these are shipped If the DVD or CD-ROM is supplied separately, the operator needs to install the program or sample image from the storage medium such as DVD or CD-ROM to the storage medium such as a hard disk. . At this time, a part of the program stored in the hard disk or the like in the apparatus main body in advance before installation is rewritten. Note that it is not always necessary to install all sample images and programs, and it is possible to install only necessary sample images, for example, sample images used for understanding and evaluating captured images. Note that the operator may select which sample image to install. Alternatively, only the control program may be installed on a hard disk or the like in the apparatus, and each sample image may be read from a storage medium such as a DVD or CD-ROM as needed. Furthermore, the sample image may be stored in the server, and the sample image may be read out as needed via the network.
[0013]
In addition, when a new pulse sequence type is installed and added to the main body of the apparatus, the parameter value of the pulse sequence changes depending on the type of pulse sequence, so the type of pulse sequence and the corresponding parameter value, and If sample images corresponding to this are stored in one storage medium, it is possible to install each image more efficiently than in the case where each is installed separately in the apparatus main body. Even if the storage medium is not necessarily a single storage medium, the installation can be performed more efficiently even if, for example, a plurality of CD-ROMs are supplied at a time in one transaction.
Next, an operation when performing imaging of a subject using the above-described MRI will be described. The operator first sets the parameters of the pulse sequence when photographing.
The parameters are set by inputting necessary parameters through the console 2 while observing the screen displayed on the image display 19. Here, FIG. 3 shows an operation flowchart performed by the operator from imaging using MRI to image evaluation in the present embodiment.
The operator selects either the sample mode for displaying the sample image or the conventional mode without the sample image from the state in which the apparatus main body is turned on. When the conventional mode is selected, the sample image is not displayed.
[0014]
On the other hand, when the operator selects the sample mode, first, in step 21, the imaging region of the subject is determined. Here, the imaging region represents a large classification such as the head, chest, and abdomen of the subject. Note that the type of imaging region is stored in the setting memory 77 in advance.
Selection of an imaging region can be performed by looking at a screen displayed on the image display 19, for example, a screen as shown in FIG. 4, and clicking with the console 2, for example, a mouse.
In FIG. 4, the head, neck, chest, abdomen, pelvis, lower limb, upper limb, etc. are classified. In this embodiment, the case where the head (shown by the hatched portion) is selected. explain. In order to determine the imaging region, the “next” button shown in the lower right part of the screen is clicked with a mouse or the like, and the process proceeds to step 22 in FIG.
Here, in FIG. 2, information on the selected imaging region and information that shifts to the next step by selecting the imaging region and clicking the “Next” button are sent from the console 2 via the CPU 72. And stored in the memory 71.
Step 22 is a step of setting the type of pulse sequence. At this time, for example, a screen shown in FIG. 5 is displayed on the image display 19. Note that the type of pulse sequence is stored in the setting memory 77 in advance.
[0015]
The screen shown in FIG. 5 shows several types of pulse sequences in the central area.
As the types of pulse sequences, SE method (spin echo), FE method (field echo), FSE method (fast spin echo), and EPI method (echo planar imaging) are displayed.
The operator selects one of the above pulse sequences with a mouse or the like, and clicks the “Next” button, thereby proceeding to Step 23. Here, in FIG. 2, information indicating that the pulse sequence type and the transition to the next step are made by selecting the pulse sequence type and clicking the “Next” button is sent from the console 2 via the CPU 72. And stored in the memory 71.
In the present embodiment, the above four types of pulse sequences are shown as an example. In addition, the MRA method or the like may be used as an option, and the types of pulse sequences are not particularly limited. Absent.
Step 23 is a step of setting the parameters of the pulse sequence. At this time, for example, the screen shown in FIG. 6 is displayed on the image display 19. The pulse sequence parameters are stored in advance in the setting memory 77 in association with the parameter types. The screen shown in FIG. 6 includes an upper area where a sample image is displayed and a lower area where a pulse sequence parameter table is displayed.
[0016]
The parameter table is a table in which a plurality of combinations of parameter values in typical recommended shooting is displayed, and is stored in advance in a storage medium such as a hard disk of the apparatus main body. In step 22, the type of pulse sequence stored in the memory 71 is read out in step 23, and parameters according to the type of pulse sequence are automatically displayed.
In the present embodiment, combinations of four parameter values are displayed. Parameters include repetition time (TR), echo time (TE), flip angle (FA) of excitation high-frequency magnetic field pulse, slice thickness ( ST), the size of the shooting area (FOV), the number of matrices (MTX), and the number of times of shooting integration (NEX) are used.
Also, the parameter table has a configuration in which, for example, four types of combinations of the above parameter values can be selected. In the present embodiment, the combination of parameter values in the third column from the top of the screen indicated by diagonal lines, TR = 2000 msec, TE = 120 msec, FA = 90 grad, ST = 6 mm, FOV = 22 cm, MTX = 256 × 256, NEX = 2. The number of parameter value combinations that can be selected is not particularly limited.
[0017]
When the “sample” button at the lower right of the screen is clicked with the combination of parameter values as described above selected with a mouse or the like, in FIG. The sample image memory corresponding to the current step is recognized, and the parameter setting sample image memory 73 is selected here. Based on the information on the imaging region stored in the memory 71 and the combination information of the selected parameter values The sample image corresponding to this is read from the parameter setting sample image memory 73, and the sample image is displayed in the area of the image display 19 where the sample image is displayed.
The sample image shown in FIG. 6 shows a tomographic image of one axial plane. However, even if the tomographic image of a plurality of planes such as an axial plane, a coronal plane, and a sagittal plane can be displayed simultaneously. It may be good or may be appropriately selected. Alternatively, different sample images with different parameter value combinations may be displayed simultaneously. In this case, the sample images can be displayed on the same screen, and which parameter value is used can be determined by comparing the sample images.
[0018]
As described above, the operator can display the same or different sample images any number of times by selecting one row of the parameter table and clicking the “sample” button with the mouse. Determine the parameters.
In addition, with the combination of parameter values in typical recommended shooting shown in the parameter table, when appropriate shooting is difficult, it is possible to change some values of the combination of parameter values.
For example, among the combinations of parameter values in the third column from the top as described above, it is possible to change from TE = 100 msec to TR = 150 msec. The change method is performed by, for example, double-clicking a portion of the sample table to be changed and inputting a numerical value with a keyboard or the like.
Further, the sample image at this time may be stored in advance in the parameter setting sample image memory 73 with TE = 150 msec, or may be calculated by calculation from the accumulated sample image. .
For example, when there is no TE = 150 msec sample image, a TE = 100 msec sample image and a TE = 200 msec sample image are read, and based on these sample images, a sample image when shooting is performed at TE = 150 msec is calculated. And display.
[0019]
Here, for example, when SE is selected as the type of pulse sequence in step 22 described above, the pixel value in a certain pixel of the MR image in the SE method is:
S = ρ ・ exp (-TE / T2) ・ (1-exp (-TR / T1))
Indicated by Here, S is the pixel value, ρ is the hydrogen nucleus density, T1 is the longitudinal relaxation time, T2 is the transverse relaxation time, and TE and TR are the echo time and the repetition time as described above.
Accordingly, the ratio of the pixel values S1 and S2 in two images that differ only in TE, in the above example, TE = 100 msec (assuming this as TE1) and TE = 200 msec (assuming this as TE2). Is
S1 / S2 = (ρ ・ exp (-TE1 / T2) ・ (1-exp (-TR / T1))} / {ρ ・ exp (-TE2 / T2) ・ (1-exp (-TR / T1)) } = exp ((TE2-TE1) / T2)
From this,
T2 = (TE2-TE1) / ln (S1 / S2)
It can be.
Here, the pixel value S3 in the case of TE = 150 msec to be calculated (this is assumed to be TE3) is calculated from the ratio with S2.
S3 = S2 ・ exp ((TE2-TE3) / T2)
And substituting the above T2 into this,
S3 = S2exp [{(TE2-TE3) / (TE2-TE1)} · ln (S1 / S2)]
By performing this operation for all the pixels, the sample image can be calculated based on the sample image stored in advance in the sample image memory even when there is no sample image suitable for the photographing condition input by the operator. . In this embodiment, the calculation of the sample image when the SE method is mainly used has been described. However, for other types of pulse sequences, a calculation method corresponding to each pulse sequence is included in the program. It is possible to calculate by setting. The newly created sample image (S3 in the above example) may be stored in a writable memory such as a DVD-RAM, a CD-R, or a hard disk. Further, regarding saving, it is preferable to determine whether or not to save according to the selection of the operator.
[0020]
As described above, if an appropriate combination of parameter values is found with reference to the retrieved or calculated sample image, the “Next” button is clicked, and the process proceeds to Step 24 in FIG. By clicking the “Next” button, the information that shifts to the next step on the memory 71 in FIG. 2 is updated. When the “return” button shown in FIG. 6 is clicked, the screen shown in FIG. 4 is displayed again, and the imaging region can be selected again.
Step 24 is a step of setting the position of the photographing region. At this time, for example, a screen shown in FIG. 7 is displayed on the image display 19. The screen shown in FIG. 7 is provided with an area where an image for aligning the position of the actual photographing area is displayed on the substantially center left side, and an area where a sample image is displayed on the approximately center right side.
7 is generally called a positioning image, and a position frame (shown by a bold line) in the positioning image is a region to be photographed. Represents.
As described above, when the “sample” button is clicked, from the imaging region setting sample image memory 74 based on the information of the selected imaging region stored in the memory 71 and the transition information to the next step. A sample image corresponding to this is read and displayed. In the present embodiment, as a sample image, a typical imaging region when a blood vessel of the head is imaged by the 3D-TOF method is shown, but in addition to this, a plurality of imaging regions are continuously provided. The example shown (multi-slice) may be sufficient.
[0021]
The operator refers to the sample image and determines the position frame displayed in the scanogram for aligning the shooting area with a keyboard, a mouse, or the like on the console 2.
When the shooting area is determined, the “shooting start” button is clicked, and the process proceeds to step 25 in FIG. By clicking the “shooting start” button, the transition information to the next step on the memory 71 is updated. When the “return” button shown in FIG. 7 is clicked, the screen returns to the screen shown in FIG. 4 or FIG. 6, and the selection of the imaging region or the combination of parameter values can be selected again.
In step 25, as described above, each magnetic field is applied from each coil to the subject via the sequence controller 17, the gradient magnetic field power source 9, and the transmission unit 11 from the computer system 15 in FIG. 13 is processed by the computer system 15. When the photographing in step 25 is completed, in step 26, the photographed image is displayed.
Step 26 is a step in which the photographed image is displayed and the operator understands and evaluates the image while observing the image. For example, the image display 19 displays a screen shown in FIG.
[0022]
The screen shown in FIG. 8 is an area where a captured image of a subject actually captured is displayed on the substantially central left side, an area where a sample image is displayed on the approximately central right side, and an area where a sample image is displayed. An area for displaying information in the sample image is provided on the upper side.
The image of the subject imaged in step 25 is automatically displayed in the area at the substantially central left side.
As described above, when the “sample” button is clicked, the sampled image memory 75 for imaged image evaluation is selected based on the information on the selected imaging region stored in the memory 71 and the information on the transition to the next step. A sample image corresponding to this is read and displayed.
This sample image is numbered at each location, and information corresponding to each number is displayed in the upper area.
The sample image may be an image taken by MRI, or may be an image that is not an actual taken image, for example, an image created by computer graphics (generally called a CG image). good.
In the present embodiment, (1) medulla, (2) caudate nucleus, (3) thalamus, (4) corpus callosum, and (5) side ventricle are shown as information on each part. In the case of a sample image showing a plurality of organs, for example, in the case of an abdominal sample image, the names of organs such as the liver, gallbladder, and stomach may be indicated for each organ.
[0023]
The operator clicks the “Finish” button upon completion of understanding and evaluation of the image with reference to the information on each part, and ends the shooting and evaluation.
According to the present embodiment, by displaying the sample image in the parameter setting step 23, it is possible to know in advance what kind of contrast, resolution, and S / N ratio image can be obtained by combining each parameter value. it can.
Also, by displaying the sample image in step 24 for setting the position of the photographing region, it is possible to know in advance what kind of image is obtained in the position setting of the photographing region in each inspection method.
Furthermore, in step 26 for evaluating the photographed image, it is possible to understand how the respective portions of the subject to be photographed are arranged, and the image can be easily evaluated.
Note that sample images can be captured and evaluated more effectively if they are displayed in all steps 23, 24, and 26, but may be used in at least one step, for example, parameter setting. The sample image may be displayed only in step 23, and the sample image may not be displayed in other steps 24 and 26.
[0024]
In the present embodiment, the sample image is displayed using the “sample” button. However, it may be set to automatically display the sample at the same time as the selection. Further, the location size of each display area on the screen is not particularly limited.
In the present embodiment, there may be a case where there is no sample image. This is the case, for example, when shooting with the latest pulse sequence or the like, and when the sample image according to the latest pulse sequence does not exist in a storage medium such as a hard disk in the apparatus or a storage medium such as the DVD. May display an error.
Further, in the present embodiment, the case where each sample image or control program is installed in the hard disk or the like in the apparatus main body is shown, but the hard disk in a personal computer (referred to as a PC), not in the apparatus in particular. It may be possible to install on. In this case, the operator can see each sample image even when the magnetic resonance apparatus main body is not owned, regardless of the particular imaging, for example, when knowing the positional relationship of an organ or the like in advance. Very effective.
[0025]
【The invention's effect】
As described above in detail, according to the present invention, when a sample image is displayed when setting a parameter or setting a position of an imaging region, the operator can determine in advance what kind of image can be obtained. Since it is possible to know, it is possible to easily set parameters and shooting area positions, and to shorten shooting time.
In addition, when a sample image is displayed when evaluating a photographed image, it is possible to easily understand the positional relationship between each part of the photographed image, so that it is possible to shorten the understanding and evaluation time of the image. It is.
Therefore, as described above, according to the present invention, the entire examination time can be shortened, the patient throughput can be improved, and the burden on the subject can be reduced.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a magnetic resonance imaging apparatus according to a first embodiment of the present invention.
FIG. 2 is a system block diagram for providing a sample image according to the first embodiment of the present invention.
FIG. 3 is a flowchart of operations performed by an operator from imaging to image evaluation using the magnetic resonance imaging apparatus according to the first embodiment of the present invention.
FIG. 4 is a display diagram of an image display when an imaging region is selected in the first embodiment according to the present invention.
FIG. 5 is a display diagram of an image display when a parameter type is selected according to the first embodiment of the present invention.
FIG. 6 is a display diagram of the image display at the time of setting the parameters of the pulse sequence in the first embodiment according to the present invention.
FIG. 7 is a display diagram of the image display at the time of setting the position of the photographing region in the first embodiment according to the present invention.
FIG. 8 is a display diagram of an image display at the time of evaluation of a captured image in the first embodiment according to the present invention.
[Explanation of symbols]
1 Gantry
2 Console
3 Static magnetic field magnet
5 Gradient coil
7 RF coil
9 Gradient magnetic field power supply
11 Transmitter
13 Receiver
15 Computer system
17 Sequence controller
19 Image display
71 memory
72 CPU
73 Sample image memory for parameter setting
74 Sample image memory for shooting area setting
75 Sample image memory for shooting image evaluation
76 Control program memory
77 Setting memory

Claims (5)

In a computer-readable storage medium storing a program for operating a computer,
The program is
A procedure for retrieving at least one sample image suitable for the imaging condition input by the operator from a plurality of sample images respectively corresponding to the imaging conditions of the magnetic resonance imaging apparatus;
In order to align the position of the imaging region in the positioning image, the sample image retrieved by the procedure and the position of the imaging region are displayed on the image display means in the magnetic resonance imaging apparatus together with the position of the positioning image and the imaging region. And the procedure
A storage medium comprising: In a computer-readable storage medium storing a program for operating a computer,
The program is
A procedure for retrieving at least one sample image suitable for the imaging condition closest to the imaging condition input by the operator from a plurality of sample images respectively corresponding to the imaging conditions of the magnetic resonance imaging apparatus;
A procedure for calculating a sample image suitable for the imaging condition from the sample image retrieved by the procedure;
Displaying the calculated sample image on the image display means in the magnetic resonance imaging apparatus;
A storage medium storing a program comprising: A plurality of sample images respectively corresponding to the imaging conditions of the magnetic resonance imaging apparatus;
From the plurality of sample images, the procedure for causing the computer to search for at least one sample image suitable for the photographing condition input by the operator and the position of the imaging region in the positioning image are searched by the procedure. And displaying the sample image and the position of the imaging region on the image display means in the magnetic resonance imaging apparatus together with the positioning image and the position of the imaging region , and a program comprising:
A storage medium in which is stored. Magnetic field generating means for generating a magnetic field in the imaging space;
Control means for controlling the magnetic field generating means under imaging conditions input by an operator;
Reconstruction means for reconstructing an image of a subject based on a signal acquired from the imaging space;
Sample image storage means for storing sample images;
Search means for searching for a sample image from the sample image storage means based on a photographing condition input by the operator;
Image display means for displaying the retrieved sample image and the position of the imaging region and the reconstructed image and the position of the imaging region ;
A magnetic resonance imaging apparatus comprising: Magnetic field generating means for generating a magnetic field in the imaging space;
Control means for controlling the magnetic field generating means under imaging conditions input by an operator;
Reconstruction means for reconstructing an image of a subject based on a signal acquired from the imaging space;
Sample image storage means for storing sample images;
Search means for searching for a sample image from the sample image storage means based on a photographing condition input by the operator;
Means for calculating a sample image suitable for the photographing condition from the retrieved sample image;
Image display means for displaying at least one of the calculated sample image and the reconstructed image;
A magnetic resonance imaging apparatus comprising:

Images