X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1994-12-06
1997-01-07
Wong, Don
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 988, H05G 160
Patent
active
055925235
ABSTRACT:
A CT scanner (10) includes a reconstruction processor (82) for reconstructing an image from digital signals from detector arrays (20). Each detector array includes scintillation crystals (22) arranged in an array for converting x-ray radiation into visible light. An array of photodetectors (24) is mounted beneath the scintillation crystal array for converting light emitted from the scintillation crystals into electrical charge. The combination scintillation crystal, photodetector array is mounted to and preferably integral with an integrated circuit (26) having charge storage devices (32, 34). Electrical charge generated by each photodetector is integrated and stored alternately by a corresponding pair of charge storage devices. The charge storage devices operate as a double buffer in which one charge storage device accumulates charge while the other holds an accumulated charge until read out by downstream circuitry. The downstream circuitry includes a plurality of amplifiers (66) and an analog digital converter (62) integrally formed on the substrate. The analog to digital converter converts analog signals corresponding to the stored charges into digital values. The digital valves created on the detector arrays are transferred in digital form to the reconstruction processor.
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Bendula Dale J.
Lindstrom Walter W.
Tuy Heang K.
Picker International Inc.
Wong Don
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