X-ray and gamma ray detector readout system

Details X-ray and gamma ray detector readout system X-ray and gamma ray detector readout system

2002-11-08

2010-10-19

Casler, Brian (Department: 3737)

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

C250S370090, C250S363030, C250S368000, C250S367000, C250S369000

Reexamination Certificate

active

07818047

ABSTRACT:
A readout electronics scheme is under development for high resolution, compact PET (positron emission tomography) imagers based on LSO (lutetium ortho-oxysilicate, Lu2SiO5) scintillator and avalanche photodiode (APD) arrays. The key is to obtain sufficient timing and energy resolution at a low power level, less than about 30 mW per channel, including all required functions. To this end, a simple leading edge level crossing discriminator is used, in combination with a transimpedance preamplifier. The APD used has a gain of order 1,000, and an output noise current of several pA/√Hz, allowing bipolar technology to be used instead of CMOS, for increased speed and power efficiency. A prototype of the preamplifier and discriminator has been constructed, achieving timing resolution of 1.5 ns FWHM, 2.7 ns full width at one tenth maximum, relative to an LSO/PMT detector, and an energy resolution of 13.6% FWHM at 511 keV, while operating at a power level of 22 mW per channel. Work is in progress towards integration of this preamplifier and discriminator with appropriate coincidence logic and amplitude measurement circuits in an ASIC suitable for a high resolution compact PET instrument. The detector system and/or ASIC can also be used for many other applications for medical to industrial imaging.

REFERENCES:
patent: 4864140 (1989-09-01), Rogers et al.
patent: 5138165 (1992-08-01), Petroff
patent: 5396187 (1995-03-01), Binkley
patent: 5451789 (1995-09-01), Wong et al.
patent: 5719400 (1998-02-01), Cherry et al.
patent: 5786597 (1998-07-01), Lingren et al.
patent: 5821541 (1998-10-01), Tumer
Kravis, Scott D., et al., “Test Results of the Readout Electronics for Nuclear Applications (RENA) Chip Developed for Position-Sensitive Solid State Detectors,” SPIE (Society of Photo-Optical Instrumentation Engineers), vol. 3445, Jul. 1998, pp. 374-382.
Kravis, Scott D., et. al., “A multichannel readout electronics for nuclear applitation RENA) chip developed for position sensitive solid state detectors,”Nuclear Instruments&Methods in Physics Research, A 422, 1999, pp. 352-356.
Mainprize, James G., et al., “Image Quality of a Prototype Direct Conversion Detector for Digital Mammography,”Society of Photo-Optical Instrumentation Engineers, 1999.
He, Z., et al., “3-D position sensitive CdZnTe gamma-ray spectrometers,”Nuclear Instruments&Methods in Physics Research, A 422, 1999, pp. 173-178.
Matteson, James L., “Position-sensitive CZT detector module,”SPIE(Society of Photo-Optical Instrumentation Engineers), vol. 3446, Jul. 1998, pp. 192-201.
Yasillo, Nicholas J., et al., “Design Considerations for a Single Tube Gamma Camera,”IEEE Transactions on Nuclear Science, vol. 37, No. 2, Apr. 1990, pp. 609-615.
Bird, A.J., et al., “Images obtained with a compact gamma camera,”Nuclear Instruments&Methods in Physics Research, A 499, 1990, pp. 480-483.
Holl, P., et al., “A Double-sided Silicon Strip Detector with Capacitive Readout and a New Method of Integrated Bias Coupling,”IEEE Transactions on Nuclear Science, vol. 36, No. 1, Feb. 1989, pp. 251-255.
Hall, G., “Silicon Drift Chambers,”Nuclear Instruments&Methods in Physics Research, A 273, 1988, pp. 559-564.
Aarsvold, J.N. et al., “Modular scintillation cameras: a progress report,”SPIE(Society of Photo-Optical Instrumentation Engineers), vol. 914, Medical Imaging II, 1988, pp. 319-325.

Affiliated with

Also associated with

Rating

X-ray and gamma ray detector readout system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with X-ray and gamma ray detector readout system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray and gamma ray detector readout system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4237730