Patent ID: 8076645

Claim:
A Compton imaging camera comprising a gamma ray detector, wherein: the gamma ray detector comprises a structure in which a first-stage detecting element, a second-stage detecting element, and a third-stage detecting element are arrayed in order from a side on which a gamma ray is incident, the first-stage detecting element is a position-sensitive gamma ray detecting element for low-energy gamma rays, comprises only one planar silicon crystal as a gamma ray detecting crystal, and is capable of detecting an interaction position and energy of a gamma ray, each of the second-stage detecting element and the third-stage detecting element is a position-sensitive gamma ray detecting element for high-energy gamma rays, comprises only one planar germanium crystal as a gamma ray detecting crystal, and is capable of detecting an interaction position and energy of a gamma ray, and the gamma ray detector detects a gamma ray that is photoelectrically absorbed at the second-stage or third stage detecting element after being Compton scattered at the first-stage detecting element, and a gamma ray that is photoelectrically absorbed at the third-stage detecting element after being Compton scattered at the second-stage detecting element.