JP2008125814A - Magnetic resonance imaging apparatus and its method for displaying region of interest - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simultaneously confirm an imaging position and a presaturation position and to easily specify the imaging position and the presaturation position even when the number of respective ROIs becomes large. <P>SOLUTION: Positioning scan is performed to an object S to acquire two or more pieces of tomographic image data, and positioning ROIs 20 and 21 for normal scan and a presaturation ROI are set on at least one of the two or more pieces of tomographic image data. The presaturation ROI is not displayed, the pixel value of the region 23 of the tomographic image data corresponding to the presaturation ROI is reduced, and display is performed on the screen of a monitor 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention performs a positioning scan on a subject such as a patient to acquire a plurality of tomographic image data, sets a region of interest (ROI) for an imaging scan on these tomographic image data, and images of the subject The present invention relates to a magnetic resonance imaging apparatus for setting a presaturation ROI for suppressing signals other than the above and a region of interest display method thereof.

  A magnetic resonance imaging apparatus (hereinafter referred to as an MRI apparatus) positions an area where a normal scan is performed on a subject before performing a normal scan (main scan: imaging scan) on a subject such as a patient. A positioning scan is performed. By performing this positioning scan, imaging is performed for a plurality of different slice positions of the subject, and a plurality of tomographic image data is acquired. Among these tomographic image data, for example, each tomographic image data is designated as reference image data, and this reference image data is displayed on the monitor screen. For example, an axial image of the subject is displayed on the monitor screen.

  However, an ROI for performing normal scanning is set on the reference image data displayed on the monitor screen. The ROI can display a plurality of reference image data on a monitor screen and can be set for each of the reference image data. For example, a sagittal image and a coronal image are created from the axial image by cross-sectional transformation, and one tomographic image data is simultaneously displayed on the monitor screen from these sagittal image and coronal image to set the ROI.

  Along with the setting of the ROI for positioning, the presaturation ROI is set on the reference image data displayed on the monitor screen. This presaturation ROI is set to suppress signals other than magnetic resonance images (hereinafter referred to as MR images) generated due to the influence of body movement, blood flow, etc. of the subject, for example.

In order to distinguish between the positioning ROI and the pre-saturation ROI on the monitor screen, a method for deleting either the positioning ROI or the pre-saturation ROI, a method for changing the display color of the ROI, or a predetermined ROI There is a method of painting with the display color.
A technique relating to the positioning of the ROM is disclosed in, for example, Patent Document 1. In Patent Document 1, when performing imaging related to a cross section of a normal scan using an MRI apparatus, first, a multi-slice image is created by performing a pilot scan, and two images are selected from the multi-slice image, It is disclosed that a ROM is set on each of these images, and normal scanning is performed with a cross section between these ROMs as an imaging cross section.

  However, when setting the positioning ROI and the pre-saturation ROI, the positioning ROI and the pre-saturation ROI may be simultaneously displayed on the monitor screen, and the number of these ROIs set may increase. The positioning ROI and the pre-saturation ROI are set by moving or rotating the reference image data on the monitor screen. When the number of ROIs set increases, It becomes difficult to set the ROI. For example, when the axial image, sagittal image, and coronal image are moved or rotated on the monitor screen as the reference image data, the positional relationship among the axial image, sagittal image, and coronal image is accurate when the number of ROI settings increases. It becomes difficult to grasp and it is difficult to set each ROI.

For this reason, if the display of either the positioning ROI or the pre-saturation ROI is turned off, the imaging position of the MR image by the main scan and the pre-saturation position cannot be confirmed at the same time. Further, if the ROI is filled with a predetermined display color, it is difficult to accurately determine the imaging position and the pre-saturation position when a plurality of ROIs overlap.
JP-A-6-217958

  An object of the present invention is to provide a magnetic resonance imaging apparatus and a region-of-interest display method capable of simultaneously confirming an imaging position and a presaturation position, and easily specifying an imaging position and a presaturation position even when the number of ROIs increases. Is to provide.

  According to a first aspect of the present invention, there is provided a magnetic resonance imaging apparatus that performs a positioning scan on a subject to acquire a plurality of tomographic image data, and at least one tomographic image among the plurality of tomographic image data. A first region-of-interest setting unit that sets a first region of interest for imaging scan on the image data, and suppresses signals other than the image of the subject on at least one of the tomographic image data A second region of interest setting unit for setting a second region of interest for display, a display unit for displaying at least one tomographic image data, and displaying the first region of interest and the second region of interest, and a display unit A display control unit that hides the second region of interest displayed in (1) and changes the display form of the tomographic image data region corresponding to the second region of interest.

  According to a thirteenth aspect of the present invention, a region of interest display method for a magnetic resonance imaging apparatus acquires tomographic image data of a subject by computer processing, and performs a positioning scan on the subject to obtain a plurality of tomographic images. Data is acquired, a first region of interest for imaging scan is set on at least one tomographic image data among the plurality of tomographic image data, and the subject is on at least one tomographic image data among the plurality of tomographic image data A second region of interest for suppressing signals other than the image is set, at least one tomographic image data is displayed on the display unit, and the first region of interest and the second region of interest are displayed on the display unit. In this case, the second region of interest is not displayed, and the display form of the tomographic image data region corresponding to the second region of interest is changed.

  According to the present invention, an imaging position and a presaturation position can be confirmed at the same time, and even if the number of ROIs increases, the imaging position and the presaturation position can be easily specified, and a region of interest display method thereof Can provide.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration diagram of a magnetic resonance imaging apparatus. The MR main body 1 detects an MR signal when magnetic resonance occurs in a subject such as a patient. That is, the MR body 1 includes a bed on which a subject such as a patient is placed, and is provided with a superconducting magnet, a gradient magnetic field coil, and an RF coil. The superconducting magnet generates a static magnetic field, and the gradient magnetic field coil generates a gradient magnetic field. The RF coil detects a weak resonance signal when a magnetic resonance is generated in a subject such as a patient in addition to a subject by generating a high-frequency magnetic field in a state where a static magnetic field and a gradient magnetic field are generated, Output as MR signal. This MR signal is detected, amplified, etc., and then digitally converted, two-dimensional / three-dimensional Fourier transformed, and reconstructed. For example, imaging of each part such as the head and chest of the subject is performed, and a plurality of tomographic image data at each slice position in these parts is acquired. Three-dimensional images of an axial image, a sagittal image, and a coronal image are created from a plurality of tomographic image data.

  The region-of-interest display processing unit 2 locates a region where a normal scan (main scan: imaging scan) is performed on the subject, and signals other than MR images generated due to the influence of body movement, blood flow, etc. of the subject The pre-saturation ROI is set to suppress this. This region-of-interest display processing unit 2 includes a program memory 4, an image memory 5, and a monitor 6 connected to the main control unit 3, and a positioning image acquisition unit 7 according to a command issued from the main control unit 3, The first region-of-interest setting unit 8, the second region-of-interest setting unit 9, the display control unit 10, and the switching operation unit 11 operate. An operation end 12 is connected to the first region-of-interest setting unit 8 and the second region-of-interest setting unit 9. The operation end 12 is, for example, a keyboard or the like, and each position of the positioning ROI and the presaturation ROI is input by operation of an operator such as a doctor.

The main control unit 3 includes a CPU, a RAM, a ROM, and the like, and executes a region-of-interest display processing program stored in advance in the program memory 4 to execute a positioning image acquisition unit 7 and a first region-of-interest setting unit 8. The second region-of-interest setting unit 9 and the display control unit 10 are operated. The region-of-interest display processing program obtains a plurality of tomographic image data by performing a positioning scan on the subject, and performs a positioning scan ROI (first scan) on at least one of the plurality of tomographic image data. 1 region of interest), a pre-saturation ROI (second region of interest) for suppressing signals other than the image of the subject on at least one of the plurality of tomographic image data, When displaying the tomographic image data on the monitor 6 and displaying the positioning ROI and the presaturation ROI on the monitor 6, the presaturation ROI is not displayed, and the pixel value of the tomographic image data region corresponding to the presaturation ROI is reduced. To do.
The image memory 5 stores a plurality of tomographic image data acquired by performing a positioning scan on the subject, a plurality of tomographic image data acquired by performing a normal scan, and the like.

  The positioning image acquisition unit 7 issues a command to perform the positioning scan to the MR main body 1 before performing the normal scan on the subject such as a patient, and the MR main body 1 performs the positioning scan on the subject. Let it be implemented. The positioning image acquisition unit 7 detects and amplifies the MR signal from the MR body 1 when a positioning scan is performed in the MR body 1 and then digitally converts it, reconstructs it by two-dimensional / three-dimensional Fourier transform, A plurality of tomographic image data of each slice position of each part such as the head and chest of the subject is acquired. These tomographic image data are stored in the image memory 5. These tomographic image data are, for example, axial images. By converting the cross section of the axial image, three-dimensional images such as a sagittal image and a coronal image are created.

  The first region-of-interest setting unit 8 reads a plurality of tomographic image data acquired by performing the positioning scan from the image memory 5, and a part of the axial image of the subject, for example, one tomographic image data, is stored in the monitor 6. The positioning ROI displayed and input by an operator such as a doctor from the operation end 12 is set on an axial image of one piece of tomographic image data displayed on the screen of the monitor 6. Even when a sagittal image or coronal image based on one tomographic image data of the subject is displayed on the monitor 6, the first region-of-interest setting unit 8 sets a positioning ROI on the sagittal image and the coronal image. To do. The positioning ROI may have any shape such as a rectangular shape or a rectangular parallelepiped shape.

  The second region-of-interest setting unit 9 reads out a plurality of tomographic image data acquired by performing the positioning scan from the image memory 5, and a part of the axial image of the subject, for example, one tomographic image data is stored in the monitor 6. The presaturation ROI displayed and input by the operator such as a doctor from the operation end 12 is set on the axial image of one piece of tomographic image data displayed on the screen of the monitor 6. Even when a sagittal image or coronal image of the subject is displayed on the monitor 6 by one tomographic image data, the first region of interest setting unit 8 sets a presaturation ROI on the sagittal image and the coronal image. To do. The pre-saturation ROI may have any shape such as a rectangular shape or a rectangular parallelepiped shape.

  When displaying the positioning ROI and the presaturation ROI on the monitor 6 simultaneously, the display control unit 10 hides the presaturation ROI and displays an axial image, a sagittal image, or a coronal image of the region corresponding to the presaturation ROI. Change form. For example, the display form of an axial image, sagittal image, or coronal image reduces the pixel value in the pre-saturation ROI. However, when the positioning ROI is displayed on the monitor 6, the display control unit 10 hides the presaturation ROI, and when the positioning ROI is not displayed, the display control unit 10 displays the presaturation ROI and hides the presaturation ROI. The pixel value of the axial image, sagittal image, or coronal image in the region corresponding to the pre-saturation ROI is reduced.

  The display control unit 10 reduces the pixel value by the following method. The display control unit 10 has a preset offset value, and subtracts the offset value from the pixel value of the axial image, sagittal image, or coronal image. The display control unit 10 has a preset coefficient, and multiplies the pixel value of the axial image, sagittal image, or coronal image by the coefficient. The display control unit 10 has a preset conversion value, and replaces the pixel value of the axial image, sagittal image, or coronal image with the conversion value.

  The switching operation unit 11 receives an operation of switching the presaturation ROI displayed on the screen of the monitor 6 to non-display or display, and outputs a switching signal indicating non-display or display to the display control unit 10. The switching operation unit 11 is, for example, a keyboard having a switching button dedicated to switching instructions or a key dedicated to switching instructions, and an instruction to hide or display the presaturation ROI is input by an operation of an operator such as a doctor. . Further, the switching operation unit 11 displays a switching instruction menu including non-display and display on the screen of the monitor 6 and instructs a non-display or display menu by operating a keyboard or a mouse, for example. Accordingly, the display control unit 10 receives the switching signal output from the switching operation unit 11 and switches the presaturation ROI displayed on the screen of the monitor 6 to non-display or display.

Next, setting of the positioning ROI and the presaturation ROI by the apparatus configured as described above will be described with reference to the region of interest display processing flowchart shown in FIG. 2 and the pixel value conversion flowchart shown in FIG.
A subject such as a patient is placed on the bed of the MR body 1. Before performing a normal scan on a subject such as a patient, the positioning image acquisition unit 7 issues a command to perform a positioning scan on the MR main body 1, and performs a positioning scan on the subject in the MR main body 1. Let it be implemented. This positioning image acquisition unit 7 detects and amplifies the MR signal from the MR body 1 when the positioning scan is performed in the MR body 1 and then digitally converts it, reconstructs it by two-dimensional / three-dimensional Fourier transform, For example, a plurality of tomographic image data at each slice position of each part such as the head and chest of the subject is acquired. These tomographic image data are stored in the image memory 5. These tomographic image data are axial images, and three-dimensional images of a sagittal image and a coronal image are created by cross-sectional conversion of the axial image.

  Next, the first region-of-interest setting unit 8 displays, for example, a part of an axial image of the subject, for example, one piece of tomographic image data on the monitor 6 from the image memory 5 in step # 1. An operator such as a doctor observes an axial image of, for example, one tomographic image data displayed on the monitor 6 and operates the operation end 12 to set a positioning ROI. The first region-of-interest setting unit 8 receives the position information of the positioning ROI set by the operation end 12 and displays the positioning ROI on the axial image of the subject displayed on the screen of the monitor 6. FIG. 4 is a diagram in which the positioning ROIs 20 and 21 are set on the axial image of the subject S. These positioning ROIs 20 and 21 are each formed in a rectangular shape, for example.

An operator such as a doctor observes the axial image of the subject displayed on the monitor 6 while the axial image of the subject S on which the positioning ROIs 20 and 21 are set is displayed on the screen of the monitor 6. The pre-saturation ROI is additionally set by operating the operation end 12.
The second region-of-interest setting unit 9 receives the position information of the pre-saturation ROI set by the operation end 12 in step # 2, and the subject by one tomographic image data displayed on the screen of the monitor 6 The pre-saturation ROI is displayed on the axial image. FIG. 5 shows a diagram in which the presaturation ROI 22 is set on the axial image of the subject S. FIG. The presaturation ROI 22 is also formed in a rectangular shape, for example.

Next, an operator such as a doctor operates the switching operation unit 11 to instruct to hide or display the presaturation ROI. Here, when an instruction to display the pre-saturation ROI is input, the switching operation unit 11 outputs a switching signal indicating the display of the pre-saturation ROI to the display control unit 10.
In step # 4, the display control unit 10 receives a switching signal indicating the display of the presaturation ROI output from the switching operation unit 11 and determines to display the presaturation ROI on the screen of the monitor 6.

Next, the display control unit 10 moves to step # 5, and displays the original image on the screen of the monitor 6 without changing the pixel value of the axial image of the subject as shown in FIG. The positioning ROIs 20 and 21 and the pre-saturation ROI 22 are displayed on the axial image of the subject.
Next, an operator such as a doctor observes an axial image of the subject displayed on the monitor 6 and operates the operation end 12 to display the positioning ROIs 20 and 21 and the presaturation ROI 22 on the screen of the monitor 6. To accurately position on a desired site on the axial image. The first region-of-interest setting unit 8 receives the position information of the positioning ROIs 20 and 21 set by the operation end 12 in step # 6, and puts it on the axial image of the subject displayed on the screen of the monitor 6. The positioning ROIs 20 and 21 are displayed. In step # 6, the second region-of-interest setting unit 9 receives the position information of the presaturation ROI 22 set by the operation end 12 and displays it on the axial image of the subject displayed on the screen of the monitor 6. The presaturation ROI 22 is displayed.

  On the other hand, when an operator such as a doctor operates the switching operation unit 11 and an instruction to hide the presaturation ROI is input, the switching operation unit 11 controls to display a switching signal indicating non-display of the presaturation ROI. To the unit 10. In step # 4, the display control unit 10 receives a switching signal indicating non-display of the presaturation ROI output from the switching operation unit 11, and determines that the presaturation ROI is not displayed on the screen of the monitor 6.

Next, the display control unit 10 moves to step # 7, and when the positioning ROIs 20, 21 and the presaturation ROI22 are simultaneously displayed on the monitor 6 as shown in FIG. 6, the presaturation ROI 22 is not displayed. The pixel value of the axial image in the region 23 corresponding to the frame of the pre-saturation ROI 22 is reduced.
Here, pixel value processing for reducing the pixel value of the axial image in the region 23 corresponding to the frame of the pre-saturation ROI 22 will be described with reference to a pixel value conversion flowchart shown in FIG. First, in step # 10, the display control unit 10 calculates a region 23 where the axial image of the subject S displayed on the screen of the monitor 6 and the presaturation ROI 22 intersect as shown in FIG.

Next, in step # 11, the display control unit 10 acquires each pixel value in the region 23 where the axial image of the subject S and the presaturation ROI 22 intersect.
Next, the display control unit 10 enters an iterative loop that scans all the pixels of the axial image of the subject S in steps # 12 to # 15. In step # 13, the display control unit 10 scans the image data of the axial image of the subject S, and determines whether or not the pixel of the axial image is a pixel existing in the region 23 of the presaturation ROI 22. As a result of this determination, if the pixel of the axial image is a pixel existing in the region 23 of the pre-saturation ROI 22, the display control unit 10 converts the pixel value to be smaller in step # 14.
As a technique for reducing the pixel value, the display control unit 10 has a preset offset value, and subtracts the offset value from the pixel value of the axial image. For example, the display control unit 10 stores the offset value “100” in advance, and subtracts the offset value “100” from the pixel value of the axial image.
The display control unit 10 has a preset coefficient, and multiplies the pixel value of the axial image by the coefficient. For example, the display control unit 10 stores the coefficient “0.3” in advance, and multiplies the pixel value of the axial image by the coefficient “0.3”.
The display control unit 10 has a conversion value set in advance, and replaces the pixel value of the axial image with the conversion value. For example, the display control unit 10 has a black pixel value “0” as the conversion value, and replaces the pixel value of the axial image with the pixel value “0”.

  When the scanning of all the pixels of the axial image of the subject S is completed, the display control unit 10 monitors the axial image in which the pixel value of the region 23 corresponding to the frame of the presaturation ROI 22 is reduced as shown in FIG. On the screen.

  Next, an operator such as a doctor observes an axial image of the subject displayed on the monitor 6 and operates the operation end 12 to display the positioning ROIs 20 and 21 and the presaturation ROI 22 on the screen of the monitor 6. To accurately position on a desired site on the axial image. Similarly to the above, the first region-of-interest setting unit 8 receives the position information of the positioning ROIs 20 and 21 set by the operation end 12 in step # 6, and the subject area displayed on the screen of the monitor 6 is received. The positioning ROIs 20 and 21 are displayed on the axial image. In step # 6, the second region-of-interest setting unit 9 receives the position information of the presaturation ROI 22 set by the operation end 12 and displays it on the axial image of the subject displayed on the screen of the monitor 6. The presaturation ROI 22 is displayed.

  When the positioning of the positioning ROIs 20 and 21 and the pre-saturation ROI 22 is completed, the main control unit 3 issues a command for performing a normal scan to the MR body 1. The MR main body 1 performs normal scanning on the positioning ROIs 20 and 21 set on the subject S. Thereby, MR images of the respective parts of the positioning ROIs 20 and 21 are acquired. The pre-saturation process is performed on the region where the pre-saturation ROI 22 is set.

Next, a case where each of the three-dimensional images of the sagittal image and the coronal image is created by converting the cross section of the axial image of the subject S will be described.
When setting the positioning ROI, the first region-of-interest setting unit 8 displays one piece of tomographic image data on the monitor 6 from the axial image, the sagittal image, and the coronal image. FIG. 7 shows an axial image A, a sagittal image B, and a coronal image C displayed on the screen of the monitor 6.
When the operation end 12 is operated by an operator such as a doctor and the positioning ROI 24 is set on the axial image A, for example, the first region of interest setting unit 8 sets the set positioning ROI 24 on the axial image A and Display on the sagittal image B. When the positioning ROI 25 is set on the sagittal image B, for example, the first region-of-interest setting unit 8 also displays the set positioning ROI 25 on the coronal image C.

When the operation end 12 is operated by an operator such as a doctor and the presaturation ROI 26 is set on, for example, the axial image A, the second region-of-interest setting unit 8 sets the set presaturation ROI 26 on the coronal image C. Is also displayed.
Next, the display control unit 10 hides the presaturation ROI 26 and displays the presaturation ROI 26 when the positioning ROIs 24 and 25 and the presaturation ROI 26 are simultaneously displayed on the screen of the monitor 6 as shown in FIG. Each pixel value of the axial image A and the coronal image C in the region 27 corresponding to the frame of the ROI 26 is reduced. The method for reducing the pixel value is the same as described above, and the description thereof is omitted here.

  As described above, according to the above-described embodiment, the subject S is positioned and scanned to acquire a plurality of tomographic image data, and the normal scanning is performed on at least one of the plurality of tomographic image data. The positioning ROI and the pre-saturation ROI are set, the pre-saturation ROI is not displayed, and the pixel value of the tomographic image data area corresponding to the pre-saturation ROI is reduced and displayed on the screen of the monitor 6. Thus, for example, when positioning each positioning ROI 20, 21 while confirming the position of the pre-saturation ROI 22, the positioning ROI and the pre-saturation ROI do not overlap, and each positioning without causing the pre-saturation ROI 22 to get in the way. Therefore, the positioning ROIs 20 and 21 can be accurately positioned at desired locations, and the positioning operability of the positioning ROIs 20 and 21 can be improved.

Since the presaturation ROI 22 reduces the pixel value of the tomographic image data area corresponding to the position of the presaturation ROI 22, the position of the presaturation ROI 22 can be confirmed even if the display of the presaturation ROI 22 is turned off. Since the tomographic image of the subject S is simply made by reducing the pixel value of the original image, the tomographic image of the subject S can be displayed in a state similar to the original image.
Accordingly, the number of set ROIs 20 and 21 for each positioning increases, and even when tomographic image data such as an axial image is moved or rotated on the screen of the monitor 6, each of these positioning ROIs 20 and 21 is accurately set to a desired site. Can be positioned.

  Even when the axial image A, the sagittal image B, and the coronal image C of the subject S are displayed and the positioning ROIs 24 and 25 and the presaturation ROI 26 are set, the axial image A, the sagittal image B, and the coronal image C are set. Thus, the positional relationship between the positioning ROIs 24 and 25 and the presaturation ROI 26 can be accurately grasped, and the positioning ROIs 24 and 25 and the presaturation ROI 26 can be easily set.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  For example, the display control unit 10 is not limited to reducing the pixel value in the area of the tomographic image data corresponding to the pre-saturation ROI 22 or the like, and may change the pixel value. For example, the display control unit 10 can change the pixel according to the brightness or color of the subject S It is also possible to increase the value. The display control unit 10 can also change the degree of decreasing the pixel value according to, for example, the brightness or hue of the subject S. For example, the pixel value is not limited to the black pixel value “0”, and may be replaced with a gray level pixel value.

  The display control unit 10 is not limited to reducing all the pixel values in the presaturation ROI, but only reduces the pixel values of specific parts in the presaturation ROI, for example, the parts that are difficult to understand due to overlapping of the positioning ROIs 20, 21, etc. May be.

  The positioning ROI by the first region-of-interest setting unit 8 and the pre-saturation ROI by the second region-of-interest setting unit 9 are set in parallel and perpendicular to the body axis of the subject S, respectively. The pixel value may be inclined with respect to the body axis of the subject S, or the pixel value of the portion where the presaturation ROI set with the inclination and the image intersects may be reduced.

1 is a configuration diagram showing a first embodiment of a magnetic resonance imaging apparatus according to the present invention. FIG. The region-of-interest display processing flowchart in the apparatus. The pixel value conversion flowchart in the same apparatus. The figure which set ROI for positioning on the axial image of a subject by the 1st region of interest setting part of the device. The figure which set presaturation ROI on the axial image of a subject by the 2nd region of interest setting part of the device. The schematic diagram which converted the pixel value of the axial image in presaturation ROI small by the display control part of the apparatus. The figure which shows the axial image, sagittal image, and coronal image which were displayed on the screen of the monitor of the apparatus. The schematic diagram which shows an example which converted each pixel value of the axial image in a presaturation ROI, and a coronal image small by the display control part of the apparatus.

Explanation of symbols

  1: MR main body, 2: region of interest display processing unit, 3: main control unit, 4: program memory, 5: image memory, 6: monitor, 7: positioning image acquisition unit, 8: first region of interest setting unit, 9: second region of interest setting unit, 10: display control unit, 11: switching operation unit, 12: operation end, 20, 21, 24, 25: positioning ROI, 22, 26: presaturation ROI, 23, 27 : An area in which the pixel value in the pre-saturation ROI is reduced.

Claims (14)

A positioning image acquisition unit that performs a positioning scan on the subject to acquire a plurality of tomographic image data;
A first region-of-interest setting unit that sets a first region of interest for imaging scan on at least one of the plurality of tomogram data;
A second region-of-interest setting unit for setting a second region of interest for suppressing signals other than the image of the subject on the at least one tomographic image data among the plurality of tomographic image data;
A display unit for displaying the at least one tomographic image data and displaying the first region of interest and the second region of interest;
A display control unit that hides the second region of interest displayed on the display unit and changes a display form of the region of the tomographic image data corresponding to the second region of interest;
A magnetic resonance imaging apparatus comprising:   The magnetic resonance imaging apparatus according to claim 1, wherein the second region of interest setting unit sets a region of interest for presaturation as the second region of interest.   When the display control unit simultaneously displays the first region of interest and the second region of interest on the display unit, the display control unit hides the second region of interest and corresponds to the second region of interest 2. The magnetic resonance imaging apparatus according to claim 1, wherein a display form of the area of the tomographic image data to be changed is changed.   The display control unit hides the second region of interest when the first region of interest is displayed, and displays the second region of interest when the first region of interest is hidden. The magnetic resonance imaging apparatus according to claim 1.   The magnetic resonance imaging apparatus according to claim 1, wherein the display control unit switches the second region of interest to non-display or display. A switching operation unit that receives a switching operation for hiding or displaying the second region of interest;
The display control unit receives a switching signal from the switching operation unit and switches the second region of interest to non-display or display;
The magnetic resonance imaging apparatus according to claim 1.   The magnetic resonance imaging apparatus according to claim 1, wherein the display control unit changes a pixel value of a region of the tomographic image data corresponding to the second region of interest.   The magnetic resonance imaging apparatus according to claim 7, wherein the display control unit reduces the pixel value.   8. The magnetic resonance imaging apparatus according to claim 7, wherein the display control unit has a preset offset value, and subtracts the offset value from the pixel value in the area of the tomographic image data.   8. The magnetic resonance imaging apparatus according to claim 7, wherein the display control unit has a preset coefficient, and multiplies the pixel value in the tomographic image data region by the coefficient.   8. The magnetic resonance imaging apparatus according to claim 7, wherein the display control unit has a conversion value set in advance, and replaces the pixel value in the area of the tomographic image data with the conversion value.   The magnetic resonance imaging apparatus according to claim 7, wherein the display control unit reduces the pixel value of a specific part in the area of the tomographic image data. In a region of interest display method of a magnetic resonance imaging apparatus that acquires tomographic image data of a subject by computer processing,
A positioning scan is performed on the subject to obtain a plurality of tomographic image data,
A first region of interest for imaging scan is set on at least one of the plurality of tomographic image data;
Setting a second region of interest for suppressing signals other than the image of the subject on the at least one tomogram data among the plurality of tomogram data;
When displaying the at least one tomographic image data on a display unit and displaying the first region of interest and the second region of interest on the display unit, the second region of interest is hidden and the first region of interest is displayed. Changing the display form of the area of the tomographic image data corresponding to the two regions of interest;
A region of interest display method for a magnetic resonance imaging apparatus. A presaturation region of interest is set as the second region of interest;
Reducing the pixel value of the tomographic image data region as a display form of the tomographic image data region corresponding to the second region of interest;
The method of displaying a region of interest of a magnetic resonance imaging apparatus according to claim 13.

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