A medical diagnostic imaging apparatus of an embodiment includes: an imaging unit configured to capture a medical image of a blood vessel in which an artificial valve is to be placed a display unit configured to display the medical image captured by the imaging unit a storage unit configured to store artificial valve information about a length of the artificial valve and a control unit configured to find a length of the artificial valve in the medical image displayed by the display unit, and to judge whether or not the length thus found and the length in the artificial valve information stored in the storage unit are the same.
