Medical image diagnostic device

A medical diagnostic imaging apparatus, comprising:

• an image data acquiring unit for acquiring a plurality of images of a moving organ of a test object that moves periodically;
• a display unit for displaying the images acquired by the image data acquiring unit;
• a matching computation unit for performing a matching computation between a template extracted containing a tracking point on one image and another image;
• a template extracting unit for extracting, from the other image, a region correlated with the template as a template of the other image by the matching computation;
• a storing unit for correlating the template with a time phase at which it has been extracted and storing the template therein;
• and
• a control unit for controlling each of the units,
• the medical diagnostic imaging apparatus being for tracking a movement of the tracking point based on the extracted template,
• wherein the template extracting unit extracts, as a key template, a region containing one or more tracking points set on an image at least one selected time phase of the moving organ, and
• wherein the matching computation unit performs the matching computation using the key template in the vicinity of the time phase at which the key template is extracted.