To generate a picture by time resolution higher than that of a scanning time at the time of obtaining a breath synchronizing picture through the use of an X-ray CT device.

This diagnostic system photographs picture information by detecting X-ray data transmitted through a patient 7 by using the X-ray CT device 4 and detects the breathing movement of the patient through the use of a breath detecting means 5 to measure breath information. In this case, the system is formed of a synchronizing means 3 for synchronizing photographing of picture information and measuring of breath information with each other, a collating means 1 generating breath synchronizing picture information being picture information synchronizing with breath by making picture information correspond to breath information and analyzing means 2 analyzing this breath synchronizing information. Then, breath synchronizing information is generated and analyzed by making raw data being picture information especially before reconstitution of a picture correspond to breath information.