Diagnosis support system, information processing method, and program

1. A diagnosis support system, comprising:

a processor; and

a memory coupled to the processor and having stored thereon instructions to be executed by the processor;

wherein the processor and the memory cooperate to act as:

an acquisition unit configured to acquire first tomographic image data and second tomographic image data;

a subtracted image generation unit configured to generate subtracted image data by performing subtraction between the first tomographic image data and the second tomographic image data;

a projection image generation unit configured to generate projection image data, in which a subject to be imaged rotates with a first direction as a rotation axis, by performing projection processing in a second direction on the subtracted image data generated by performing subtraction between the first tomographic image data and the second tomographic image data, wherein the second direction substantially perpendicular to the first direction corresponding to a stacking direction in which a plurality of cross-sectional images forming at least one of the first tomographic image data and the second tomographic image data are stacked is set as a direction of a sight line; and

a display control unit configured to display a projection image based on the projection image data generated by performing projection processing in the second direction on the subtracted image data; and

an operation unit configured to set a coordinate on the projection image,

wherein the display control unit displays, at the same time, the projection image generated by performing the projection processing in the second direction on the subtracted image data, a first cross-sectional image of the first tomographic image data corresponding to the coordinate set by the operation unit on the projection image, and a second cross-sectional image of the second tomographic image data corresponding to the coordinate set by the operation unit on the projection image, and

wherein the projection image is non-axial section, and the first cross-sectional image and the second cross-sectional image are axial section.

2. The diagnosis support system according to claim 1 , wherein the display control unit displays the first cross-sectional image of the first tomographic image data, the second cross-sectional image of the second tomographic image data and the projection image based on the projection image data by performing projection processing on the subtracted image data on a same screen.

3. The diagnosis support system according to claim 1 , wherein the display control unit updates the first cross-sectional image of the first tomographic image and the second cross-sectional image of the second tomographic image in a case where the operation unit changes the coordinate on the projection image.

4. The diagnosis support system according to claim 1 , wherein the processor and the memory cooperate to further act as an operation unit configured to set the second direction.

5. The diagnosis support system according to claim 3 , wherein the display control unit switches the first cross-sectional image of the first tomographic image and the second cross-sectional image of the second tomographic image simultaneously in a case where a drag operation is performed in a predetermined direction on the projection image.

6. The diagnosis support system according to claim 1 , wherein, in a case where the operation unit places a pointer on the projection image, the display control unit does not update the projection image.

7. The diagnosis support system according to claim 1 , wherein a plane direction of the first cross-sectional image and the second cross-sectional image is different from a plane direction of a projection plane of the projection image based on the projection image data by performing projection processing on the subtracted image data.

8. The diagnosis support system according to claim 1 , wherein the display control unit displays the projection image based on the projection image data while rotating the projection image around a predetermined rotation axis.

9. The diagnosis supporting system according to claim 1 , wherein the projection image generation unit changes the second direction at a predetermined time interval and generates a projection image, and wherein the display control unit displays the projection image corresponding to the changed direction.

10. The diagnosis support system according to claim 1 , wherein the processor and the memory cooperate to further act as an image registration unit configured to perform image registration processing for deforming one or both of the first tomographic image data and the second tomographic image data.

11. The diagnosis support system according to claim 1 , wherein the projection image of the non-axial section is substantially perpendicular to the first cross-sectional image and second cross-sectional image of the axial section.

12. An information processing method, comprising:

acquiring first tomographic image data and second tomographic image data;

generating subtracted image data by performing subtraction between the first tomographic image data and the second tomographic image data;

generating projection image data, in which a subject to be imaged rotates with a first direction as a rotation axis, by performing projection processing in a second direction on the subtracted image data generated by performing subtraction between the first tomographic image data and the second tomographic image data, wherein the second direction substantially perpendicular to the first direction corresponding to a stacking direction in which a plurality of cross-sectional images forming at least one of the first tomographic image data and the second tomographic image data are stacked is set as a direction of a sight line; and

displaying a projection image based on the projection image data generated by performing projection processing in the second direction on the subtracted image data,

wherein the displaying includes displaying, at the same time, the projection image generated by performing projection processing in the second direction on the subtracted image data, a first cross-sectional image of the first tomographic image data corresponding to the coordinate set on the projection image by the setting, and a second cross-sectional image of the second tomographic image data corresponding to the coordinate set on the projection image by the setting, and

wherein the projection image is non-axial section, and the first cross-sectional image and the second cross-sectional image are axial section.

13. A non-transitory computer-readable recording medium in which a program for causing a computer to execute an information processing method is stored, the information processing method comprising:

acquiring first tomographic image data and second tomographic image data;

generating subtracted image data by performing subtraction between the first tomographic image data and the second tomographic image data;

generating projection image data, in which a subject to be imaged rotates with a first direction as a rotation axis, by performing projection processing in a second direction on the subtracted image data generated by performing subtraction between the first tomographic image data and the second tomographic image data, wherein the second direction substantially perpendicular to the first direction corresponding to a stacking direction in which a plurality of cross-sectional images forming at least one of the first tomographic image data and the second tomographic image data are stacked is set as a direction of a sight line;

displaying a projection image based on the projection image data generated by performing projection processing in the second direction on the subtracted image data; and

setting a coordinate on the projection image based on the projection image data generated by performing projection processing in the second direction on the subtracted image data,

wherein the displaying includes displaying, at the same time, the projection image generated by performing projection processing in the second direction on the subtracted image data, a first cross-sectional image of the first tomographic image data corresponding to the coordinate set on the projection image by the setting, and a second cross-sectional image of the second tomographic image data corresponding to the coordinate set on the projection image by the setting, and

wherein the projection image is non-axial section, and the first cross-sectional image and the second cross-sectional image are axial section.

14. A diagnosis support system, comprising:

a processor; and

a memory coupled to the processor and having stored thereon instructions to be executed by the processor;

wherein the processor and the memory cooperate to act as:

an acquisition unit configured to acquire first tomographic image data and second tomographic image data;

a subtracted image generation unit configured to generate subtracted image data by performing subtraction between the first tomographic image data and the second tomographic image data;

a projection image generation unit configured to generate projection image data, in which a subject to be imaged rotates with a first direction as a rotation axis, by performing projection processing in a second direction on the subtracted image data generated by performing subtraction between the first tomographic image data and the second tomographic image data, wherein the second direction substantially perpendicular to the first direction corresponding to a stacking direction in which a plurality of cross-sectional images forming at least one of the first tomographic image data and the second tomographic image data are stacked is set as a direction of a sight line;

a display control unit configured to display a projection image based on the projection image data generated by performing projection processing in a second direction on the subtracted image data; and

an operation unit configured to set a coordinate on the projection image based on the projection image data generated by performing projection processing in a second direction on the subtracted data,

wherein the display control unit displays, at the same time, the projection image generated by performing projection processing in a second direction on the subtracted image data, a first cross-sectional image of the first tomographic image data corresponding to the coordinate set on the projection image by the operation unit, and a second cross-sectional image of the second tomographic image data corresponding to the coordinate set on the projection image by the operation unit,

wherein the projection image is non-axial section, and the first cross-sectional image and the second cross-sectional image are axial section, and

wherein the second direction is substantially orthogonal to a third direction corresponding to a surface normal to the first cross-sectional image and the second cross-sectional image.