1. A medical image processing apparatus comprising: a memory circuitry configured to store a program; and a processing circuitry configured to read out the program from the memory circuitry and execute the program; wherein the processing circuitry is configured to: set a region of interest to be observed and a region of non-interest that is different to the region of interest based on volume data, and determine a trajectory of an arm that holds an X-ray irradiator configured to irradiate X-rays and a detector configured to detect the X-rays that are irradiated, based on a relative positional relationship between the region of interest and the region of non-interest.