Medical image-processing apparatus, medical image-processing method, and storage medium
A medical image-processing apparatus of an embodiment includes a processing circuitry. The processing circuitry acquires a plurality of medical images including a predetermined region and having different time phases. The processing circuitry sets a first region of interest and a second region of interest in each of the plurality of medical images. The processing circuitry derives a temporal change in first pixel values, which are pixel values on the first region of interest, on the basis of the first pixel values and derives a temporal change in second pixel values, which are pixel values on the second region of interest, on the basis of the second pixel values. The processing circuitry sets a first time window on the basis of the temporal change in the first pixel values and sets a second time window on the basis of the temporal change in the second pixel values.
1 . A medical image-processing apparatus, comprising:
processing circuitry configured to:
acquire a plurality of medical images including a predetermined region and having different time phases;
set a first region of interest in a first portion, which is a part of the predetermined region, in each of the plurality of medical images;
set a second region of interest in a second portion, which is a part of the predetermined region and is different from the first portion in which the first region of interest is set, wherein the predetermined region is a set of bilaterally symmetrical regions in a human or animal body, the first portion is one region of the set of regions, and the second portion is another region of the set of regions;
derive a temporal change in first pixel values, which are pixel values on the first region of interest, over the plurality of medical images based on the first pixel values;
derive a temporal change in second pixel values, which are pixel values on the second region of interest, over the plurality of medical images based on the second pixel values;
set a first time window for imaging the first portion based on the temporal change in the first pixel values; and
set a second time window for imaging the second portion based on the temporal change in the second pixel values,
wherein the processing circuitry is further configured to derive a temporal change in third pixel values corresponding to a combination of the first pixel values and the second pixel values,
set a third time window based on the temporal change in the third pixel values,
set a fourth time window serving as a candidate period at a time of setting the first time window and the second time window based on the third time window, and
set the first time window and the second time window within a range of the fourth time window.
2 . The medical image-processing apparatus according to claim 1 , wherein the processing circuitry is further configured to generate a first parameter with respect to the first portion based on the temporal change in the first pixel values within the first time window and to generate a second parameter with respect to the second portion based on the temporal change in the second pixel values within the second time window.
3 . The medical image-processing apparatus according to claim 1 , wherein the third time window is a period shorter than at least the fourth time window.
4 . The medical image-processing apparatus according to claim 1 , wherein the fourth time window is a period equal to or shorter than one heartbeat.
5 . The medical image-processing apparatus according to claim 1 , wherein the first time window and the second time window are different periods from each other.
6 . The medical image-processing apparatus according to claim 1 , wherein the area of the first region of interest and the area of the second region of interest are different from each other.
7 . The medical image-processing apparatus according to claim 1 , wherein a plurality of first regions of interest and a plurality of second regions of interest are set.
8 . A medical image-processing method using a computer, the method comprising:
acquiring a plurality of medical images including a predetermined region and having different time phases;
setting a first region of interest in a first portion, which is a part of the predetermined region, in each of the plurality of medical images;
setting a second region of interest in a second portion, which is a part of the predetermined region and is different from the first portion in which the first region of interest is set, wherein the predetermined region is a set of bilaterally symmetrical regions in a human or animal body, the first portion is one region of the set of regions, and the second portion is another region of the set of regions;
deriving a temporal change in first pixel values, which are pixel values on the first region of interest, over the plurality of medical images based on the first pixel values;
deriving a temporal change in second pixel values, which are pixel values on the second region of interest, over the plurality of medical images based on the second pixel values;
setting a first time window for imaging the first portion based on the temporal change in the first pixel values; and
setting a second time window for imaging the second portion based on the temporal change in the second pixel values,
wherein the medical image-processing method further comprises
deriving a temporal change in third pixel values corresponding to a combination of the first pixel values and the second pixel values,
setting a third time window based on the temporal change in the third pixel values,
setting a fourth time window serving as a candidate period at a time of setting the first time window and the second time window based on the third time window, and
setting the first time window and the second time window within a range of the fourth time window.
9 . A non-transitory computer-readable storage medium storing a program that when executed by a computer, causes the computer to perform a method comprising:
acquiring a plurality of medical images including a predetermined region and having different time phases;
setting a first region of interest in a first portion, which is a part of the predetermined region, in each of the plurality of medical images;
setting a second region of interest in a second portion, which is a part of the predetermined region and is different from the first portion in which the first region of interest is set, wherein the predetermined region is a set of bilaterally symmetrical regions in a human or animal body, the first portion is one region of the set of regions, and the second portion is another region of the set of regions;
deriving a temporal change in first pixel values, which are pixel values on the first region of interest, over the plurality of medical images on the first pixel values;
deriving a temporal change in second pixel values, which are pixel values on the second region of interest, over the plurality of medical images on the second pixel values;
setting a first time window for imaging the first portion on the temporal change in the first pixel values; and
setting a second time window for imaging the second portion on the temporal change in the second pixel values,
wherein the medical image-processing method further comprises
deriving a temporal change in third pixel values corresponding to a combination of the first pixel values and the second pixel values,
setting a third time window based on the temporal change in the third pixel values,
setting a fourth time window serving as a candidate period at a time of setting the first time window and the second time window based on the third time window, and
setting the first time window and the second time window within a range of the fourth time window.