Radiation imaging device and nuclear medicine diagnostic device using same

A nuclear medicine diagnostic device comprising:

• a pixel-type detector group where detectors are arrayed having a spread as a plane, and each detector constitutes each pixel;
• a radiation measuring circuit which reads out a detection signal from the detector group;
• and
• a collimator partitioned by a septa, and arrayed with a plurality of through-holes which are extending in a direction perpendicular to the detector plane;
• characterized by comprising:
• a radiation imaging device which acquires incident position information of radiation emitted from a body of a subject mounted on a bed for each detector by:
• setting the size of the through-hole such that a plurality of the pixels are arrayed in a plane view from the direction perpendicular to the detector plane;
• arranging the septa in displacing from a boundary line between the detector pair in a plane view from the direction perpendicular to the detector plane;
• further arranging the septa so as to be orthogonal to the boundary line between the detector pair in a plane view from the direction perpendicular to the detector plane;
• arranging the top of the through-hole in a plane view from the direction perpendicular to the detector plane in displacing from the boundary line of the detector pair;
• and
• arranging the top of the detectors in a plane view from the direction perpendicular to the detector plane so as to be visible through the through-hole;
• and
• a tomography image information preparation device which forms picture image information using a response function, by acquiring a detection signal from the detector.