According to one embodiment, a medical diagnostic imaging apparatus includes processing circuitry. The processing circuitry receives a subject's examination information including a case and an examination body part. The processing circuitry acquires a first search result by searching a library that associates an imaging protocol with each case using the subject's case. The processing circuitry acquires a second search result by searching a library that associates a slice condition with each examination body part using the subject's examination body part. The processing circuitry determines an imaging protocol for the subject based on the first search result, and determines a slice condition for the subject based on the second search result. The processing circuitry stores the received examination information and the determined imaging protocol and slice condition in a predetermined library in such a manner as to associate them with each other.