Boots – shoes – and leggings
Patent
1983-11-09
1986-07-08
Chin, Gary
Boots, shoes, and leggings
364527, 364571, 250363R, G01T 120
Patent
active
045996903
ABSTRACT:
Radiation events of a radiation detector which are subject to deadtime losses during the acquisition time are detected as event triggers. For each detected radiation event a deadtime signal is provided. The acquisition time is subdivided into a succession of evaluation time intervals and the fractional amount of deadtime is measured within each evaluation time interval to obtain a measure for count rate losses. From the fractional amount of deadtime a replication probability is evaluated and dependent thereon all radiation events detected between the end of one evaluation time and the end of a following one are evaluated to generate (a) one pulse for each detected radiation event; and (b) a sequence of a number of pulses for randomly selected events.
REFERENCES:
patent: 3896296 (1975-07-01), Barnhart
patent: 4058728 (1977-11-01), Nickles
patent: 4369495 (1983-01-01), Inbar et al.
"Deadtime Characteristics of Anger Cameras", by James A. Sorenson, Journal of Nuclear Medicine, Apr. 1975, vol. 16, No. 4, Lines 284-288.
"The Influence of True Counting Rate and the Photo Peak Fraction of Detected Events on Anger Camera Deadtime", by John E. Arnold et al., Journal of Nuclear Medicine, Jun. 1974, vol. 15, No. 6, Lines 412-416.
"Theoretical Studies of Image Artifacts and Counting Losses for Different Photon Fluence Rates and Pulse-Height Distributions in Single-Crystal Nal(T1) Scintillation Cameras" by Sven-Erik Strand et al., The Journal of Nuclear Medicine 1980, vol. 21, pp. 264-275.
"Correction for Deadtime Losses in a Gamma Camera/Data Analysis System", by K. Cranley et al., European Journal of Nuclear Medicine 5, 1980, pp. 377-382.
"On the Performance of Loss-Free Counting: A Method for Real-Time Compensation of Dead-Time and Pile-Up Losses in Nuclear Pulse Spectroscopy", by G. P. Westphal, Nuclear Instruments & Methods 163 (1979), pp. 189-196, N. Holland Publishing Co.
"Counting Errors in Amplitude Spectrometry of Pulses (Survey)", by V. B. Ivanov et al., Instruments and Experimental Technology, vol. 22, No. 6, Part 1, Nov.-Dec. 1979, pp. 1491-1508.
Tanaka et al., "New Anger Scintillation Cameras with Improved Count Rate Capability", Jul. 1980, pp. 8-13, vol. 29, No. 7, Radioisotopes (Japan).
Black Thomas G.
Chin Gary
Jay Mark H.
Siemens Gammasonics Inc.
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