Analyzer

1. An analyzer, comprising:

processing circuitry configured to

identify at least a part of a contour of a heart of a subject for an image corresponding to a first cardiac time phase that is included in time-series images including the heart of the subject,

identify the at least part of the contour of the heart of the subject for an image corresponding to a second cardiac time phase that is included in time-series images,

calculate, using information indicating positions of the identified contours, a first cardiac function parameter representing at least one of a volume and an ejection fraction of a heart chamber, and a second cardiac function parameter that is different from the first cardiac function parameter, the second cardiac function parameter representing a global strain of a myocardium corresponding to the heart chamber,

select the image corresponding to the first cardiac time phase and the image corresponding to the second cardiac time phase out of the time-series images, and

cause the selection of the images, the identification of the contours, and control for displaying the first cardiac function parameter and the second cardiac function parameter on a display to be performed in accordance with a first request that is a single request and is a request for calculating a cardiac function parameter.

2. The analyzer according to claim 1 , further comprising memory circuitry configured to store therein at least information indicating a position of the contour identified in the image corresponding to the second cardiac time phase, wherein

the processing circuitry

reads the information indicating the position of the contour, the information being stored in the memory circuitry, and

calculates a third cardiac function parameter that represents a regional strain of the myocardium using the read information indicating the position of the contour after the second cardiac function parameter is calculated.

3. The analyzer according to claim 2 , wherein the processing circuitry

causes the first cardiac function parameter and the second cardiac function parameter to be displayed in accordance with a first request input to the processing circuitry, and

reads the information indicating the position of the contour stored in the memory circuitry in accordance with a second request input to the processing circuitry after the second cardiac function parameter is displayed.

4. The analyzer according to claim 3 , wherein the processing circuitry reads the information indicating the position of the contour stored in the memory circuitry in accordance with the second request input to the processing circuitry subsequently after the first request is input to the processing circuitry.

5. The analyzer according to claim 2 , wherein

the processing circuitry identifies the contour for each of three or more images included in the time-series images in order to select the image corresponding to the first cardiac time phase and the image corresponding to the second cardiac time phase,

the memory circuitry stores therein the information indicating positions of the identified contour for each of the three or more images, and

the processing circuitry further reads the information indicating the positions of the contour, the information being stored in the memory circuitry, for each of the three or more images.

6. The analyzer according to claim 2 , wherein the processing circuitry

identifies at least a part of a contour of the heart for each of a plurality of images included in the time-series images by speckle tracking using the read information, and

calculates the third cardiac function parameter using information indicating positions of the contour identified by the speckle tracking.

7. The analyzer according to claim 2 , wherein the memory circuitry stores therein the information indicating the positions of the contour for each cross section corresponding to each of a plurality of images included in the time-series images.

8. The analyzer according to claim 2 , wherein

the time-series images are time-series cross-sectional images each corresponding to a longitudinal cross section of the heart of the subject, and

the processing circuitry

identifies a full contour of an endocardium of the heart chamber, and

calculates the second cardiac function parameter on the basis of a length of the identified full contour.

9. The analyzer according to claim 1 , wherein the processing circuitry causes a contour marker representing the contour of the part of the heart of the subject, the contour serving as a target of the calculation of the second cardiac function parameter, to be displayed on at least one of the image corresponding to the first cardiac time phase and the image corresponding to the second cardiac time phase, in accordance with a third request.

10. The analyzer according to claim 1 , wherein the first cardiac time phase corresponds to an end-systole while the second cardiac time phase corresponds to an end-diastole.

11. The analyzer according to claim 1 , wherein the processing circuitry calculates the second cardiac function parameter for each of a plurality of cross sections different from one another, and calculates a statistic of a plurality of calculated second cardiac function parameters.

12. The analyzer according to claim 1 , wherein the processing circuitry calculates the second cardiac function parameter for each of a plurality of cardiac periods different from one another, and calculates a statistic of a plurality of calculated second cardiac function parameters.

13. The analyzer according to claim 1 , wherein

the time-series images are time-series two-dimensional images generated from time-series three-dimensional images generated by scanning a three-dimensional region, and

the processing circuitry

identifies a two-dimensional contour of the heart of the subject for the two-dimensional image corresponding to the end-systole and the two-dimensional image corresponding to the end-diastole that are included in the time-series two-dimensional images, and

calculates the first cardiac function parameter and the second cardiac function parameter using the information indicating the positions of the identified two-dimensional contours.

14. The analyzer according to claim 1 , wherein

the processing circuitry

identifies the contour of the heart of the subject, the heart of the subject being included in a cross-sectional image corresponding to a longitudinal cross section of the heart of the subject, and

causes the identified contour to be displayed on the cross-sectional image displayed on a display while a display form of a portion along a myocardium in the identified contour and a display form of a portion that is not along the myocardium are differentiated from each other.

15. An analyzer, comprising:

processing circuitry configured to

identify a position of an annulus of a heart of a subject for a cross-sectional image corresponding to a first cardiac time phase that is included in time-series cross-sectional images corresponding to a longitudinal cross section of the heart of the subject,

identify a position of the annulus of the heart of a subject for a cross-sectional image corresponding to a second cardiac time phase that is included in the time-series cross-sectional images,

calculate a moving distance of the annulus between the first cardiac time phase and the second cardiac time phase on the basis of the identified positions of the annulus,

select the image corresponding to the first cardiac time phase and the image corresponding to the second cardiac time phase out of the time-series images, and

cause the selection of the images, the identification of the position of the annulus of the heart, and control for displaying the moving distance of the annulus on a display to be performed in accordance with a first request that is a single request and is a request for calculating the moving distance of the annulus.

16. The analyzer according to claim 1 , wherein the second cardiac function parameter is a global longitudinal strain (GLS).