X-ray diagnostic apparatus and medical image processing apparatus

An X-ray diagnostic apparatus comprising:

• an X-ray tube configured to generate X-rays;
• an X-ray detector configured to detect X-rays generated by the X-ray tube and transmitted through a subject;
• an image generating unit configured to generate a plurality of time-series medical images of vasoganglion in a predetermined organ of the subject based on an output from the X-ray detector;
• a region setting unit configured to set a first upstream region and a first downstream region of a stenosis location in a first blood vessel in the vasoganglion on the medical images;
• a curve generating unit configured to generate a stenosis upstream curve indicating a change in pixel value in the time-series based on a plurality of pixel values included in the first upstream region, and generate a stenosis downstream curve indicating a change in pixel value in the time-series based on a plurality of pixel values included in the first downstream region;
• a stenosis index generating unit configured to generate a stenosis index indicating a degree of stenosis in the first blood vessel based on the stenosis upstream curve and the stenosis downstream curve;
• and
• a display unit configured to display the stenosis index.