Image processing device and x-ray diagnostic apparatus

1. An image processing device, comprising:

processing circuitry configured to

acquire a plurality of first image data indicating a plurality of time-sequential bloodstream images obtained after administering contrast agent to an object,

setting a target region on second image data, the second image data being generated based on the plurality of first image data so as to indicate information on temporal change of pixel values of each pixel, and

select a reproduction section by selecting at least reproduction-start image data and reproduction-end image data from the plurality of first image data based on bloodstream information of the target region.

2. The image processing device according to claim 1 ,

wherein the processing circuitry is configured to select image data of consecutive time-sequential bloodstream images including the reproduction-start image data and the reproduction-end image data out of the plurality of first image data as the reproduction section based on the bloodstream information of the target region.

3. The image processing device according to claim 1 ,

wherein the processing circuitry is configured to output information on image data selected for selecting the reproduction section and store the information on image data selected for selecting the reproduction section in a memory circuit.

4. The image processing device according to claim 1 ,

wherein the processing circuitry is configured to set at least two points on the second image data and set the target region based on the at least two points.

5. The image processing device according to claim 1 ,

wherein the processing circuitry is configured to generate the second image data as color image data based on the plurality of time-sequential bloodstream images.

6. The image processing device according to claim 1 ,

wherein the plurality of first image data are projection data of a plurality of time-sequential X-ray images obtained after administering contrast agent to the object or image data of a plurality of time-sequential DSA images obtained from the projection data of a plurality of time-sequential X-ray images.

7. The image processing device according to claim 1 ,

wherein the processing circuitry is configured to consecutively display a plurality of bloodstream images included in the reproduction section in time-sequential order on a display connected with the image processing device.

8. The image processing device according to claim 7 ,

wherein the processing circuitry is configured to cause the display to perform enlarged display of the target region without displaying regions, other than the target region, in each of the plurality of bloodstream images.

9. The image processing device according to claim 7 , wherein the processing circuitry is configured to

acquire image data of a plurality of time-sequential DSA images as the plurality of first image data,

calculate temporal change of pixel values for each pixel whose position is common to time-sequential DSA images,

calculate a bloodstream information parameter value for each pixel based on the temporal change of pixel values,

generate image data of a plurality of time-sequential parametric time phase images as the second image data by assigning a pattern of chromatic colors to the each pixel, the pattern of chromatic colors changing for every time phase according to the bloodstream information parameter value, and

control the display in such a manner that the display consecutively displays a plurality of DSA images included in the reproduction section in time-sequential order on one region of a screen of the display while the display consecutively displays the plurality of time-sequential parametric time phase images on another region of the screen.

10. The image processing device according to claim 9 , wherein the processing circuitry is configured to generate the image data of the plurality of time-sequential parametric time phase images, by aligning a length of one cycle of the pattern of chromatic colors over every pixel, and

control a frame rate of reproducing the plurality of time-sequential parametric time phase images such that a period of consecutively displaying all of the DSA images included in the reproduction section in time-sequential order is synchronized with a period of consecutively displaying one cycle of the plurality of time-sequential parametric time phase images in time-sequential order.

11. The image processing device according to claim 9 , wherein the processing circuitry is configured to

generate the image data of the plurality of time-sequential parametric time phase images, by aligning a length of one cycle of the pattern of chromatic colors over every pixel, and

control a frame rate of reproducing the plurality of time-sequential parametric time phase images such that a period of consecutively displaying all of the DSA images included in the reproduction section in time-sequential order is synchronized with a period of consecutively displaying a plurality of cycles of the plurality of time-sequential parametric time phase images in time-sequential order.

12. The image processing device according to claim 7 ,

wherein the processing circuitry is configured to distinguishably display the target region on the display by covering regions except the target region with a fixed color or superimposing a frame on an outer border of the target region.

13. The image processing device according to claim 1 ,

wherein the processing circuitry is configured to receive inputted information on the target region and set the target region according to the inputted information on the target region.

14. The image processing device according to claim 1 , wherein the processing circuitry is configured to

perform threshold processing on a subtraction image acquired by subtraction between the plurality of time-sequential bloodstream images, and

set the target region based on a result of the threshold processing.

15. An X-ray diagnostic apparatus, comprising:

an X-ray generator configured to generate X-rays;

an X-ray detector configured to detect the X-rays having passed through the object;

control circuitry configured to generate the plurality of first image data based on the detected X-rays having passed through the object, at a corresponding plurality of times after administration of contrast agent to the object; and

the image processing device according to claim 1 .