X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1989-01-24
1989-09-26
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
250367, 378 5, G01N 2300
Patent
active
048706671
ABSTRACT:
An improved computed tomography radiation detector is disclosed. One embodiment includes first and second layers of crystalline scintilation 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 efficiency for x-ray/light conversion. A photodiode is positioned to view both scintillation layers simultaneously and to respond to scintillations in either or both. Scintillation 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.
REFERENCES:
patent: 3965358 (1976-06-01), Macovski
patent: 4070581 (1978-01-01), Gibbons et al.
patent: 4127932 (1978-12-01), Hartman et al.
patent: 4247774 (1981-01-01), Brooks
patent: 4292538 (1981-09-01), Carlson
patent: 4323784 (1982-04-01), Conrad
patent: 4365341 (1982-12-01), Lam
patent: 4511799 (1985-04-01), Bjorkholm
patent: 4535245 (1985-08-01), Zonneveld et al.
Kurfess et al., "NaI(Tl)-CsI(Na) Phoswitch Detectors for X-Ray Astronomy", IEEE Trans. NuSci, vol. NS-22, pp. 626-632, Feb. 1975.
Alvarez et al., "Energy-Selective Reconstruction in X-Ray Computerized Tomography", Phys. Med. Biol., 1976, vol. 21, pp. 733-744, 1976.
Patents Abstracts of Japan, vol. 9, No. 68 (P-344)[1791], 28th Mar. 1985; & JP-A-59 200 983 (Toshiba K.K.) 14-11-1984.
Brunnett Carl J.
Mattson Rodney A.
Church Craig E.
Picker International Inc.
LandOfFree
Radiation detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radiation detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radiation detector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-193193