JP2001101449A - Three-dimensional image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-dimensional (3D) image display device improved in operability by providing a means for facilitating setting of an MPR surface and grasping of a spatial position thereof concerning the device for displaying a 3D image while using a 3D boxel having pixel values corresponding to the physical character of a testee. SOLUTION: The 3D device capable of easily displaying the MPR image of arbitrary angle and arbitrary position and intuitively comprehending a position relation is provided with a means for setting a plane to an image 3D boxel space with a 3D image displayed by performing arbitrary rotating and arbitrary moving as a reference, a means for preparing the MPR image from the pixel value of the boxel crossing this plane, a means for mapping the MPR image of this plane at a corresponding position in the space having the same coordinate system as the image 3D boxel, and a means for displaying the MPR image while keeping the spatial position relation with the 3D image. Further, operation is facilitated by using the 3D image displayed on a display screen as guide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional image display device for displaying a spatial distribution of physical properties of a subject as a three-dimensional image.

[0002]

2. Description of the Related Art Since accurate cross-sectional image data representing physical properties of a human body has been obtained by an X-ray CT apparatus, a three-dimensional stereoscopic image has been obtained by using a plurality of cross-sectional image data photographed at different cross-sectional positions. Has been done. Particularly, recently, a helical scan X-ray CT apparatus and a cone beam X-ray CT apparatus have been put into practical use, so that a more precise three-dimensional stereoscopic image can be reconstructed.

In a three-dimensional display method of a medical image, a subject is generally treated as a three-dimensional array of voxels having pixel values corresponding to physical properties. The main display methods are surface rendering, which extracts the boundary surface of the object that constitutes the object and displays the shape of the boundary surface, and voxels that have opacity corresponding to the physical properties of the object. There is a volume rendering method. There is also a cross section conversion method (MPR) for displaying a cross section of a three-dimensional array of voxels.

In the surface rendering method, an area including an object is extracted by threshold processing for specifying an upper limit and a lower limit of a pixel value of the object. By performing a shadowing process and a projection process on the surface of this region, the surface of the target object is displayed as a three-dimensional image.

In the volume rendering method, an object is treated as a voxel having opacity and color information corresponding to pixel values, and a shadowing process and a projection process called ray casting are performed on the voxel. Display as the original image.

In the cross-section conversion method (MPR), for example, three planes orthogonal to a three-dimensional array of voxels are set, and a cross-sectional image of the plane is created.

In many cases, detailed observation of many directions and many cross sections is performed while performing arbitrary rotation and arbitrary movement on a three-dimensional image created by a surface rendering method or a volume rendering method. Therefore, it is necessary to freely rotate and move the three-dimensional image. Further, when the three-dimensional image is rotated or moved, it is necessary to accurately grasp the angle and position at which the three-dimensional image is observed. Therefore, a user interface that guides the rotation and movement of the three-dimensional image in an easy-to-understand manner is required.

In the MPR, since the setting of the plane is simple, a cross-sectional image of a plane parallel to the CT image and two planes orthogonal to the CT image,
That is, an axial image, a sagittal image, and a coronal image are often created. However, there is a clinical need to observe a cross-sectional image of an arbitrary surface called an oblique image. Another problem is that it is difficult to understand the mutual positional relationship between the cross-sectional images of the three orthogonal planes. Therefore, a method for easily setting any three planes is required, and a display method for easily understanding the mutual positional relationship between the three cross sections is required.

[0009]

A three-dimensional image using a three-dimensional array of voxels having pixel values corresponding to physical properties can provide deeper spatial information than that obtained by observing a two-dimensional image. However, knowledge and experience are still required to grasp spatial information. Therefore,
There is a need for a means for freely and easily setting the position and direction of the three-dimensional image and a new method for grasping the current position and direction from various angles. In addition, understanding of spatial information is deepened by using three-dimensional images, but in order to understand deeply, it is required that related two-dimensional information can be easily referred to. In MPR, there is a clinical need to observe a tomographic image of an arbitrary plane, but setting an arbitrary plane generally requires a complicated operation. Therefore, a method for easily setting an arbitrary plane or three planes is required. In addition, a display method is required in which the mutual positional relationship of the three cross-sectional images can be easily understood. In this way, in order to make the 3D image more useful, the operator can freely set the position and direction of the object of interest, and intuitively grasp the position and direction of the currently displayed 3D image. There is a need for a versatile way of doing things.

[0010]

SUMMARY OF THE INVENTION The present invention has been devised in order to solve the above-mentioned problems, and is based on a three-dimensional image displayed by performing arbitrary rotation and arbitrary movement.
Means for setting an orthogonal plane in an image three-dimensional voxel space;
Means for creating an MPR image from pixel values of voxels intersecting this plane or three orthogonal planes, and mapping the MPR image of this plane or three orthogonal planes to corresponding positions in a space having the same coordinate system as the image three-dimensional voxel And a means for displaying an MPR image while maintaining a spatial positional relationship with the three-dimensional image. This makes it possible to easily display an MPR image at an arbitrary angle and an arbitrary position, and to easily understand the positional relationship.

According to the present invention, in order to easily set the plane or three orthogonal planes of the MPR to any desired plane, a plane based on a three-dimensional image displayed by performing arbitrary rotation and arbitrary movement is referred to. Alternatively, means for setting three orthogonal planes in the image three-dimensional voxel space is provided. This makes it possible to easily display an MPR image at an arbitrary angle.

In the present invention, the three-dimensional image or the MPR image displayed on the display screen is used as a guide for setting the display angles of the three-dimensional image and the MPR image. This facilitates setting of the display angle of the three-dimensional image and the MPR image.

According to the present invention, a cubic frame representing a region of the image three-dimensional voxel space is displayed simultaneously with the three-dimensional image and / or the MPR image. This facilitates the understanding of the positional relationship between the three-dimensional image and the MPR three-dimensional image for displaying the understanding of the position information, and the setting of the display angle and the display position.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a three-dimensional image display device according to the present invention will be described. FIG. 1 is a schematic diagram showing a configuration of an embodiment of the present invention. The data collection unit 1 is, for example, an X-ray CT
The apparatus is a part that irradiates X-rays from around the subject and measures the amount of transmitted X-rays to collect projection data. In this embodiment, the case where the data acquisition unit 1 is an X-ray CT apparatus will be described. However, the present invention also functions in the case of another apparatus such as an MR apparatus.

In this embodiment, an X-ray CT apparatus of an electron beam scanning system is shown as an example. The electron beam 13 emitted from the electron gun 12 is controlled to scan on the X-ray target 11 arranged annularly around the subject. The X-ray generated by the X-ray target passes through a cross section of the subject lying on the bed 16 and is converted into a current by the X-ray detector 14. The output of the X-ray detector is converted into digital data by the data collection circuit 15. By repeatedly performing electron beam scanning while moving the bed 16, data of a plurality of cross sections of the subject is collected. The reconstruction processing unit 2 performs pre-processing, reconstruction processing, and post-processing on the data to create image data. This image data represents a spatial distribution of CT values corresponding to the X-ray transmission coefficient of the subject.

The reconstruction processor 2 is a data processor including a high-speed processor having a function of reconstructing projection data. The three-dimensional image processing unit 3 is a data processing device having a function of reconstructing a three-dimensional image. These functions may be integrated or separated. The data storage device 21 has a function of storing the image data obtained by the reconstruction operation processing unit 2.

The three-dimensional image processing unit 3 includes a reconstruction operation processing unit 2
A three-dimensional image is reconstructed using the image data obtained by the above. The image data obtained by the reconstruction operation processing unit 2 may be used directly, the image data stored in the data storage device 21 may be used, or the image data stored in an offline medium may be used.

The image display device 4 includes a three-dimensional image display area 4
1, an MPR oblique image display area 42, orthogonal image display areas 43, 44, 45, and a setting panel for setting parameters.

FIG. 2 is a view for explaining an image coordinate system and an object used in this embodiment. Reference numeral 51 denotes an Xi-Yi plane of an image coordinate system based on the image plane of the CT image, and 52 denotes a Yi-Zi plane of the image coordinate system. 53, 54
The figure shows an image three-dimensional voxel region formed by stacking CT images having image planes parallel to the Xi-Yi plane in the Zi direction. 55 is the Xi-Yi plane of the subject, and 56 is the Yi-Zi plane of the subject.

FIG. 3 shows an image display section of the image apparatus. 10
Reference numerals 1, 102, and 103 are areas for displaying three orthogonal images of MPR. 104 is an area for displaying a three-dimensional image, 105
Is an area for displaying an MPR oblique image. 111
FIG. 3 shows an image three-dimensional voxel area corresponding to 53 and 54 in FIG. 2 in a three-dimensional image display area. 11
Reference numeral 2 denotes a three-dimensional display of a subject corresponding to 55 and 56 in FIG. 113 is 53, 54 in FIG.
Is shown by a frame in the MPR oblique image display area. 114 is MPR
9 shows an oblique image display.

The image three-dimensional voxel region 111 in the three-dimensional image display region 104 and the image three-dimensional voxel region 113 in the MPR oblique image display region 105 are displayed at the same display angle. When the image three-dimensional voxel area 111 is rotated in the three-dimensional image display area 104, MP
In the R oblique image display area 105, the image three-dimensional voxel area 113 rotates by the same angle. When the image three-dimensional voxel region 113 is rotated in the MPR oblique image display region 105, the three-dimensional image display region 104
, The image three-dimensional voxel region 111 rotates by the same angle. As described above, the image three-dimensional voxel region 111 in the three-dimensional image display region 104 and the image three-dimensional voxel region 113 in the MPR oblique image display region 105 are always displayed at the same angle.

Reference numeral 120 denotes a display screen coordinate system. This is a coordinate system representing the three-dimensional image display area and the MPR oblique image display area, and is used when explaining rotation and movement of the three-dimensional image and the MPR oblique image.

Reference numeral 121 denotes a coordinate system of an image displayed in the orthogonal MPR image display area 101. Xd of display screen coordinate system
The -Yd plane is shown. Reference numeral 122 denotes a coordinate system of an image displayed in the orthogonal MPR image display area 102. The Xd-Zd plane of the display screen coordinate system is shown. 123 is orthogonal M
3 illustrates a coordinate system of an image displayed in a PR image display area 103. The Yd-Zd plane of the display screen coordinate system is shown.

Reference numeral 124 denotes an image coordinate system of an image displayed in the three-dimensional image display area 104 and the MPR oblique image display area 105. In the three-dimensional image display area 104 and the MPR three-dimensional image display area 105, the three-dimensional image
The R oblique images are displayed at the same angle.

The orthogonal MPR image display area 101 and the orthogonal MP
A line 125 in the R image display area 102 is a line indicating the display surface of the MPR image displayed in the orthogonal MPR image display area 103. Orthogonal MPR image display area 101 and orthogonal MP
A line 126 in the R image display area 103 is a line indicating the display surface of the MPR image displayed in the orthogonal MPR image display area 102. Orthogonal MPR image display area 102 and orthogonal MP
A line 127 in the R image display area 103 is a line indicating a display surface of the MPR image displayed in the orthogonal MPR image display area 101.

Reference numeral 131 denotes an MPR image of a plane indicated by a line 127 in the orthogonal MPR image display area 102 or the orthogonal MPR image display area 103. Reference numeral 132 denotes an MPR image of a plane indicated by a line 126 in the orthogonal MPR image display area 101 or the orthogonal MPR image display area 103. 133
Is an MPR image of a plane indicated by a line 125 in the orthogonal MPR image display area 101 or the orthogonal MPR image display area 102.

One of the MPR oblique image display areas 105
Reference numeral 14 denotes an MPR oblique image. This MPR
The plane on which the oblique image is created is determined based on the three-dimensional image 112 displayed in the three-dimensional image display area 104. That is, the plane on which the MPR oblique image is created is determined based on the position of the three-dimensional image 112 displayed in the three-dimensional image display area 104 on the display screen. In the display screen coordinate system 120, the MPR image on the Xd-Yd plane where Zd is equal to the position of the display screen is displayed as the MPR oblique image 114.

When the three-dimensional image 112 displayed in the three-dimensional image display area 104 is rotated, the relationship between the three-dimensional image 112 and the display screen changes, so that the MPR oblique image displayed in the MPR oblique image display area 105 is changed. Is
It is displayed according to the new relationship between the three-dimensional image 112 and the display screen. That is, by rotating the three-dimensional image 112 displayed in the three-dimensional image display area 104, M
M displayed in PR oblique image display area 105
The PR oblique image can be rotated.

Similarly, when the display position of the three-dimensional image 112 displayed in the three-dimensional image display area 104 is moved, the three-dimensional image 112 moves with respect to the display screen.
The MPR oblique image displayed in the R oblique image display area 105 is displayed according to a new positional relationship between the three-dimensional image and the display screen. That is, when the three-dimensional image 112 displayed in the three-dimensional image display area 104 is moved in the vertical direction on the screen, the MPR oblique image display area 10
The cross-sectional position of the MPR oblique image displayed in 5 can be changed.

By moving and rotating the display position of the three-dimensional image 112 displayed in the three-dimensional image display area 104, an MPR image of an arbitrary surface in the image three-dimensional voxel space is converted to an MPR image.
This can be displayed as the MPR oblique image 114 displayed in the R oblique image display area 105.

Since the three-dimensional image 112 displayed in the three-dimensional image display area 104 is used as a guide indicating the position of the MPR oblique image displayed in the MPR oblique image display area 105, this has often been a problem in the past. , MPR oblique images can be easily understood.

In FIG. 3, the orthogonal MPR image display area 101
Displays the same image as the MPR oblique image 114 displayed in the MPR oblique image display area 105. In the orthogonal MPR image display area 102, the MPR
MPR displayed in the oblique image display area 105
An MPR image of a plane 126 orthogonal to the oblique image 114 is displayed. In the orthogonal MPR image display area 103,
The MP of the plane 125 orthogonal to the MPR oblique image 114 displayed in the MPR oblique image display area 105
The R image is displayed.

Changing the cross-sectional position of the MPR image 132 displayed in the orthogonal MPR image display area 102 by moving the position of the plane 126 orthogonal to the MPR oblique image 114 displayed in the MPR oblique image display area 105 Can be. In addition, by moving the position of the plane 125 orthogonal to the MPR oblique image 114, the cross-sectional position of the MPR image 133 displayed in the orthogonal MPR image display area 103 can be changed.

By moving the sectional position 127 displayed in the MPR image 132 displayed in the orthogonal MPR image display area 102, the position of the three-dimensional image 112 displayed in the three-dimensional image display area 104 in the Zd direction, and MP
The position of the MPR oblique image 114 displayed in the R oblique image display area in the Zd direction can be moved.

The orthogonal MPR image display areas 101, 102,
By moving 127, 126, 125 on the 103, the MPR images 131, 132, 133 display the cross-sectional images of the new plane, but at the same time, the three-dimensional image 112 displayed in the three-dimensional image display area 104. Of the MPR oblique image 114 displayed in the MPR oblique image display area can be moved.

In the MPR oblique image display area 105, a frame 113 indicating an image three-dimensional voxel area is displayed together with the MPR oblique image 114.
It is easy to understand the positional relationship between the R oblique image and the image three-dimensional voxel region.

When the mouse pointer is moved in the horizontal direction of the screen, ie, in the Xd direction of 120, near the center of the three-dimensional image display area 104 or the MPR oblique image display area 105, the image three-dimensional voxel 111 and the three-dimensional image 112, Image three-dimensional voxel 113 rotates around the 120 Yd axis. As the MPR oblique image 114, an MPR image of a corresponding surface is displayed. 3D image display area 1
04 or near the center of the MPR oblique image display area 105, when the mouse pointer is moved in the vertical direction of the screen, that is, in the Yd direction of 120, the image three-dimensional voxel 111, the three-dimensional image 112, and the image three-dimensional voxel 113
Rotates around the 120 Xd axis. As the MPR oblique image 114, an MPR image of a corresponding surface is displayed. When the mouse pointer is moved near the inscribed circle of the three-dimensional image display area 104 or the MPR oblique image display area 105 so as to rotate around the tangent direction of the inscribed circle, that is, around the Zd axis of 120, the image becomes a three-dimensional voxel. 111, the three-dimensional image 112, and the image three-dimensional voxel 113 rotate around the Zd axis of 120. MPR Oblique Image 114
Indicates an MPR image of the corresponding surface. At the same time, the image of the corresponding surface is also displayed for the MPR image displayed in the orthogonal MPR image display area.

By rotating the mouse wheel in the three-dimensional image display area 104 or the MPR oblique image display area 105, the image three-dimensional voxel 111, the three-dimensional image 112, and the image three-dimensional voxel 113 are displayed in the normal direction of the display screen. That is, it can move in the Zd direction.
As the MPR oblique image 114, an MPR image of a corresponding surface is displayed. 3D image display area 104 or MPR
While the right mouse button is pressed in the oblique image display area 105, the pointer is moved in the horizontal direction of the screen,
When moved in the Xd direction of 0, the image three-dimensional voxel 111
And the three-dimensional image 112 and the three-dimensional image voxel 113 can be moved in the horizontal direction of the screen. As the MPR oblique image 114, an MPR image of a corresponding surface is displayed.
When the pointer is moved in the vertical direction of the screen while the right button of the mouse is pressed, that is, in the Yd direction of 120, the image three-dimensional voxel 111, the three-dimensional image 112, and the image three-dimensional voxel 113 are moved in the vertical direction of the screen. Can be. The MPR oblique image 114 shows the MP of the corresponding surface.
The R image is displayed. At the same time, the image of the corresponding surface is also displayed for the MPR image displayed in the orthogonal MPR image display area.

By operating the mouse in the three-dimensional image display area 104 or the MPR oblique image display area 105, the three-dimensional image 112 can be freely rotated and freely moved. Further, it has become possible to display the MPR oblique image and the orthogonal MPR of the corresponding surface. This makes it possible to observe the three-dimensional image 112 and the MPR oblique image 114 in detail from any direction.

FIG. 4 is a view showing a state in which the mouse pointer is moved left and right in the three-dimensional image display area 104 or the MPR oblique image display area 105 in FIG.
A state in which the three-dimensional image 112 and the MPR oblique image 114 are rotated around the d axis is shown.

A first aspect of the present invention is a means for setting a plane or three orthogonal planes in an image three-dimensional voxel space with reference to a three-dimensional image displayed by performing arbitrary rotation and arbitrary movement, and means for setting this plane or three-dimensional voxel space. Means for generating an MPR image on an orthogonal plane, means for mapping the MPR image on the plane or the three orthogonal planes to a corresponding position in a space having the same coordinate system as the image 3D voxel, and a spatial positional relationship with the 3D image Means for displaying the MPR image while maintaining the image quality. As a result, an MPR image of an arbitrary cross section can be displayed by a simple operation, and the spatial position of the MPR image can be easily understood.

According to a second aspect of the present invention, there is provided means for setting a plane or three orthogonal planes in an image three-dimensional voxel space based on a three-dimensional image displayed by performing arbitrary rotation and arbitrary movement. Means for creating an MPR image of an orthogonal plane and mapping pixel values of voxels intersecting this plane or three orthogonal planes to corresponding positions in a new three-dimensional voxel space having the same coordinate system as the image three-dimensional voxel There are provided a means for creating a new three-dimensional voxel, a means for displaying the MPR three-dimensional voxel in a three-dimensional image, and a means for displaying an MPR image while maintaining a spatial positional relationship with the three-dimensional image. by this,
The MPR image of an arbitrary cross section can be displayed by a simple operation, and the spatial position of the MPR image can be easily understood.

According to a third aspect of the present invention, in the three-dimensional image apparatus according to the first or second aspect, the three-dimensional image displayed on the display screen is used as a guide to display the three-dimensional image and the MPR oblique image. , The setting of the display angle and the display position of the MPR image is facilitated.

According to a fourth aspect of the present invention, in the three-dimensional image apparatus according to the first or second aspect, the M displayed on the display screen.
The use of the PR image as a guide facilitates setting of a three-dimensional image to be displayed, an MPR oblique image, a display angle and a display position of the MPR image.

According to a fifth aspect of the present invention, in the three-dimensional image apparatus according to the first or second, third, or fourth aspect,
By displaying the cubic frame representing the spatial region of the image three-dimensional voxel simultaneously with the three-dimensional image and / or the MPR image, understanding the positional relationship between the three-dimensional image and the MPR image to be displayed, and setting the display angle and the display position Is made easier.

In the above examples, image data obtained by an X-ray CT apparatus has been described as an example. However, the same applies to image data obtained by other medical image apparatuses such as an MR apparatus and an ultrasonic apparatus. .

[0047]

The present invention has devised a method of setting an MPR image plane using a plane based on a three-dimensional display image that can be freely rotated and moved. This makes it possible to easily set the MPR image plane at an arbitrary position.
In addition, since it has become possible to observe a 3D image and an MPR image simultaneously, it is easy to observe and grasp spatial information, and it is easy to associate a 3D image with a 2D image.
In addition, related two-dimensional information can be referred to immediately.

Although the MPR image has been conventionally used, there is a disadvantage that it is difficult to freely set a plane or three orthogonal planes in the region of interest. By using a three-dimensional display image as a reference, a plane or three orthogonal planes can be set in the region of interest by a simple operation.

In the present invention, the MPR display image is linked to the three-dimensional display image. Although the MPR image has been conventionally used, there is a disadvantage that it is difficult to grasp the spatial positional relationship between the MPR image plane and the subject. By linking the MPR image and the three-dimensional image, it is easy to grasp the spatial positional relationship of the MPR image.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the configuration of an embodiment according to the present invention.

FIG. 2 shows an object and a coordinate system used for description.

FIG. 3 is an image display screen showing an embodiment of the present invention.

FIG. 4 is an image display screen showing an embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 data collection unit 2 reconstruction operation processing unit 3 three-dimensional image processing unit 4 image display device 5 operation unit 11 X-ray target 12 electron gun 13 electron beam 14 X-ray detector 15 data collection circuit 16 couch 21 data storage device 41 tertiary Original image display area 42 MPR oblique image display area 43 Orthogonal MPR image display area 44 Orthogonal MPR image display area 45 Orthogonal MPR image display area 46 Setting panel 51 Image coordinate system Xi-Yi plane 52 Image coordinate system Yi-Zi plane 53 Three-dimensional Voxel region Xi-Yi surface 54 Three-dimensional voxel region Yi-Zi surface 55 Subject Xi-Yi surface 56 Subject Yi-Zi surface 101 Orthogonal MPR image display region 102 Orthogonal MPR image display region 103 Orthogonal MPR image display region 104 Three-dimensional Image display area 105 MPR oblique image display area 11 Reference Signs List 1 image three-dimensional voxel region 112 three-dimensional image 113 image three-dimensional voxel region 114 MPR oblique image 120 coordinate system of display screen for three-dimensional image display / MPR oblique display 121 coordinate system of orthogonal MPR image display region 122 orthogonal MPR image display region Coordinate system 123 Coordinate system of orthogonal MPR image display area 124 Image coordinate system 125 Cursor of display cross section position of orthogonal MPR image 126 Cursor of display cross section of orthogonal MPR image 127 Cursor of display cross section of orthogonal MPR image 131 Orthogonal MPR image 132 Orthogonal MPR image 133 orthogonal MPR image

Continued on the front page F-term (reference) 4C093 AA22 AA26 BA05 BA07 CA15 CA23 EA04 ED07 EE01 FF12 FF32 FF42 FF43 FF45 FG05 FG13 5B050 AA02 BA03 EA12 EA19 EA27 EA28 FA02 FA12 5B057 AA07 BA03 CA03 CD04

Claims (5)

[Claims] 1. A three-dimensional image display device using a three-dimensional voxel having a pixel value corresponding to a physical property of a subject (hereinafter referred to as an image three-dimensional voxel) to perform display by performing arbitrary rotation and arbitrary movement. Means for setting a plane or three orthogonal planes in the image three-dimensional voxel space based on the obtained three-dimensional image as a reference, and a cross-section conversion image (hereinafter, referred to as a cross-section image) displaying pixel values of voxels intersecting the plane or the three orthogonal planes as a cross-section image
Means for creating an MPR image), means for mapping the MPR image on this plane or three orthogonal planes to corresponding positions in a space having the same coordinate system as the image three-dimensional voxel, and maintaining the spatial positional relationship with the three-dimensional image Means for displaying an MPR image while displaying the MPR image at an arbitrary angle and at an arbitrary position, and easily understanding the positional relationship. 2. A three-dimensional image display device using a three-dimensional voxel having a pixel value corresponding to a physical property of a subject (hereinafter referred to as an image three-dimensional voxel) to perform display by performing arbitrary rotation and arbitrary movement. Means for setting a plane or three orthogonal planes in the image three-dimensional voxel space based on the obtained three-dimensional image as a reference, and a cross-section conversion image (hereinafter, referred to as a cross-section image) displaying pixel values of voxels intersecting the plane or the three orthogonal planes as a cross-section image
A means for creating an MPR image and a pixel value of a voxel intersecting this plane or three orthogonal planes are converted to a new three-dimensional voxel (hereinafter referred to as M) having the same coordinate system as the image three-dimensional voxel.
Means for creating a new three-dimensional voxel by mapping to a corresponding position in the PR three-dimensional voxel) space, means for displaying the MPR three-dimensional voxel in a three-dimensional image,
Means for displaying the MPR image while maintaining the spatial positional relationship with the three-dimensional image.
A three-dimensional image display device capable of easily displaying an MPR image at an arbitrary angle and an arbitrary position. 3. The three-dimensional image apparatus according to claim 1, further comprising means for using the displayed three-dimensional image as a guide for setting a display angle and a display position of the three-dimensional image and the MPR image. A three-dimensional image display device that facilitates setting of display angles and display positions of three-dimensional images and MPR images, and facilitates understanding of positional relationships. 4. The three-dimensional image apparatus according to claim 1, further comprising means for using the displayed MPR image as a guide for setting a display angle and a display position of the three-dimensional image and the MPR image. A three-dimensional image display device that facilitates setting of a display angle and a display position of a three-dimensional image and an MPR image, and facilitates understanding of a positional relationship. 5. A three-dimensional image apparatus according to claim 1, wherein a frame of a cube representing a spatial region of the image three-dimensional voxel is simultaneously formed with the three-dimensional image and / or the MPR image. A three-dimensional image display device comprising means for displaying, thereby facilitating understanding of a positional relationship between a three-dimensional image and an MPR image to be displayed, and setting of a display angle and a display position.