Gamma camera device
First Claim
1. A gamma camera device comprising:
- means for receiving a radiation ray from a test subject dosed with a radioisotope, the receiving means generating scintillation light according to the received radiation ray;
a plurality of photomultipliers optically coupled with said radiation ray receiving means, for generating electrical signals in response to the scintillation light;
first position detection means for detecting one of said plurality of photomultipliers nearest to the point of incidence of the radiation ray in accordance with the electrical signals generated by said plurality of photomultipliers; and
second position detection means for detecting a precise position on said radiation ray receiving means where the radiation ray is incident in accordance with the electrical signals generated by a block of photomultipliers, said block including the photomultiplier that is detected by said first position detection means and a predetermined number of photomultipliers located around said detected photomultiplier.
1 Assignment
0 Petitions
Accused Products
Abstract
A radiation ray (gamma ray) radiated from a test subject previously dosed with radioisotope is incident on a scintillator and converted into scintillation light. A plurality of photomultipliers arranged in a hexagon receive and convert the scintillation light into electrical signals. Photomultipliers arranged in parallel with sides of the hexagon constitute a group. Output signals of the photomultipliers are supplied to a first position detector for detecting a group of photomultipliers which receives the scintillation light and deriving position information Xo and Yo representing the approximate gamma ray incident position. The position information Xo and Yo and the output signals of the photomultiplier are supplied to a second position detector for deriving position information x and y representing the precise gamma ray incident position. Outputs of the photomultiplier are supplied to a pulse height analyzer which derives incident radiation energy information z.
14 Citations
9 Claims
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1. A gamma camera device comprising:
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means for receiving a radiation ray from a test subject dosed with a radioisotope, the receiving means generating scintillation light according to the received radiation ray; a plurality of photomultipliers optically coupled with said radiation ray receiving means, for generating electrical signals in response to the scintillation light; first position detection means for detecting one of said plurality of photomultipliers nearest to the point of incidence of the radiation ray in accordance with the electrical signals generated by said plurality of photomultipliers; and second position detection means for detecting a precise position on said radiation ray receiving means where the radiation ray is incident in accordance with the electrical signals generated by a block of photomultipliers, said block including the photomultiplier that is detected by said first position detection means and a predetermined number of photomultipliers located around said detected photomultiplier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification