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US 8,410,447 B2Granted
Particle radiotherapy apparatus
AssigneeShimadzu Corporation
InventorHiromichi Tonami
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AssigneeShimadzu Corporation
InventorHiromichi Tonami
Estimating the term…
In a particle radiotherapy apparatus which has a passage for allowing movement of a particle beam, this invention provides a particle radiotherapy apparatus with high sensitivity for detection of annihilation radiation pairs even if there is a difference between a point where the particle beam loses energy and a position of a detector ring in a body axis direction of a patient. For the purpose of solving such a problem, the particle radiotherapy apparatus according to this invention includes an elliptic detector ring which is vertically long and is reversibly tiltable. Consequently, annihilation gamma ray pairs are detected with the single elliptic detector ring. Then, annihilation gamma ray pairs occurring inside the elliptic detector ring will be detected. In other words, all annihilation gamma ray pairs will impinge on the single elliptic detector ring at substantially right angles. This inhibits lowering of sensitivity for detection.
A particle radiotherapy apparatus comprising a detector ring constructed of an annular arrangement of radiation detectors formed by laminating, in one direction, scintillators with planes of incidence for receiving radiation and converting the radiation into fluorescence, light guides for receiving and transmitting the fluorescence, and photodetectors for detecting the fluorescence, and in addition thereto, an elongated top board inserted in an opening of the detector ring, and a particle beam emitting device for emitting a particle beam, the particle radiotherapy apparatus further comprising:
Dependencies are inferred from the claim text.