Medical image processing device, medical image processing method, and storage medium

1 . A medical image processing device comprising:

processing circuitry configured to

acquire a medical image obtained by imaging at least an artery;

detect a branch point of the artery on the basis of the medical image;

identify a dominated region of the artery on a downstream side of the branch point in the medical image;

cause a display to display the dominated region;

derive a time density curve on the basis of a change over time in a luminance value of each pixel of the medical image;

generate a contrast delay time map in which a delay period of time of a contrast medium injected into the artery is set as a pixel value on the basis of the time density curve; and

identify a dominated region of the artery on the contrast delay time map using a region expansion method.

2 . The medical image processing device according to claim 1 , wherein the processing circuitry is further configured to

set a part of the artery on the medical image as a blood vessel of interest, and

identify the dominated region on the basis of the blood vessel of interest.

3 . The medical image processing device according to claim 2 , wherein the processing circuitry is further configured to

set a seed point with respect to each blood vessel branching at the branch point; and

identify the dominated region on the basis of the seed point on the blood vessel and of interest the seed point located downstream of the blood vessel of interest.

4 . The medical image processing device according to claim 1 , wherein the processing circuitry is further configured to

set a region of interest in the medical image; and

identify the dominated region on the basis of the region of interest.

5 . The medical image processing device according to claim 4 , wherein the processing circuitry is further configured to

set a seed point with respect to each blood vessel branching at the branch point; and

identify the dominated region on the basis of the seed point in the region of interest and a seed point located upstream of a blood vessel of interest.

6 . The medical image processing device according to claim 1 , wherein the processing circuitry is further configured to

detect a first branch point and a second branch point adjacent to each other; and

identify a region between the first branch point and the second branch point as the dominated region.

7 . The medical image processing device according to claim 1 ,

wherein the artery is a cerebral artery, and

wherein the processing circuitry further identifies a dominated region of the artery located downstream of an artery circle of Willis and located on a downstream side of the branch point.

8 . A medical image processing method to be executed using a computer, the medical image processing method comprising:

acquiring a medical image obtained by imaging at least an artery;

detecting a branch point of the artery on the basis of the medical image;

identifying a dominated region of the artery on a downstream side of the branch point in the medical image;

causing a display to display the dominated region;

deriving a time density curve on the basis of a change over time in a luminance value of each pixel of the medical image;

generating a contrast delay time map in which a delay period of time of a contrast medium injected into the artery is set as a pixel value on the basis of the time density curve; and

identifying a dominated region of the artery on the contrast delay time map using a region expansion method.

9 . A computer-readable non-transitory storage medium storing a program for causing a computer to:

acquire a medical image obtained by imaging at least an artery;

detect a branch point of the artery on the basis of the medical image;

identify a dominated region of the artery on a downstream side of the branch point in the medical image;

cause a display to display the dominated region;

derive a time density curve on the basis of a change over time in a luminance value of each pixel of the medical image;

generate a contrast delay time map in which a delay period of time of a contrast medium injected into the artery is set as a pixel value on the basis of the time density curve; and

identify a dominated region of the artery on the contrast delay time map using a region expansion method.

10 . The medical image processing device according to claim 1 , wherein the processing circuitry is further configured to

set a seed point with respect to each blood vessel branching at the branch point;

generate a blood vessel-dominated region map by color-coding each region of the contrast delay time map with a different pixel value for each the seed point on the contrast delay time map using the region expansion method; and

cause the display to display the blood vessel-dominated region map.