G - Physics – 01 – T
Patent
G - Physics
01
T
358/11.1
G01T 1/00 (2006.01) G01T 1/20 (2006.01) G01T 1/202 (2006.01)
Patent
CA 1260160
24 Improved Radiation Detection Apparatus and Method Abstract An improved computed tomography radiation detector is disclosed. One embodiment includes first and second layers of crystalline scintillation material mutually aligned in a path of x-rays to be detected, to receive the x-rays in sequence. The layer upstream in the x- ray path comprises a scintillation material having a relatively high efficiency for converting x-ray energy to light. The downstream one of the layers comprises a scintillation material having a relatively lower efficien- cy for x-ray/light conversion. A photodiode is positioned to view both scintillation layers simultaneously and to respond to scintillations in either or both. Scintil- lation crystal material surfaces can be coated with reflective material to enhance the effects of their scintillations. The photodiode thus combines x-ray indicating scintillations from both crystals while in analog form. The detector exhibits enhanced response to lower energy x-rays. Another embodiment comprises a photodiode and an optically coupled scintillation crystal, with the photodiode upstream in the x-ray beam path relative to the crystal.
512178
Brunnett Carl J.
Mattson Rodney A.
Picker International Inc.
Ridout & Maybee Llp
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