X-ray computed tomography apparatus and medical image display apparatus

An X-ray computed tomography apparatus, comprising:

• an X-ray generator comprising an X-ray tube;
• a high-voltage generator configured to generate a tube voltage to be applied to the X-ray tube;
• an X-ray detector configured to detect X-rays irradiated from the X-ray tube and transmitted through a subject;
• a controller configured to control the high-voltage generator to scan the subject;
• and
• circuitry configured to:
• generate a reference image based on projection data acquired by a pre-scan;
• generate real-time monitor images based on projection data acquired by a monitor scan which is executed after the pre-scan at a same study as the pre-scan;
• generate superimposed images which have higher visibility than the real-time monitor images by synthesizing at least a part of the reference image and each real-time monitor image based on a weighted distribution, the weighted distribution being obtained by standardizing and inverting intensity distribution data;
• control a display to display the superimposed images in a window;
• determine a timing of a main scan which is executed at the same study as the pre-scan and the monitor scan in accordance with the superimposed images;
• and
• generate a main scan image based on projection data acquired by the main scan.