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The United States of America As Represented by the Department of Energy

Charles A Kelsey

Thomas E Zipperian

Antonio J Ricco

Robert C Hughes

David M Wolfe

Jay B Snelling

Bernd Bassalleck

Frederick A Mettler

Richard Lane

Dennis D Huffman

Michael F Hartshorne

The arrangement imaging a body through gamma radiation comprising the steps of detecting, within each fixed time period of a succession of fixed time periods at a plurality of locations impinged by the gamma radiation, electric charge levels corresponding to photoelectric events; counting within each fixed period only those charge levels at each location which are greater than a predetermined threshold level, and adding the counted charge levels for the succession of fixed time periods, whereby a distinct image of the body may be produced therefrom.

Digital gamma ray imaging device

Methods of and apparatus for in vivo radiation measurements relay on a MOSFET dosimeter of high radiation sensitivity with operates in both the passive mode to provide an integrated dose detector and active mode to provide an irradiation rate detector. A compensating circuit with a matched unirradiated MOSFET is provided to operate at a current designed to eliminate temperature dependence of the device. Preferably, the MOSFET is rigidly mounted in the end of a miniature catheter and the catheter is implanted in the patient proximate the radiation source.

Methods of in vivo radiation measurement

Growing community of inventors

Albuquerque, NM, United States of America

Charles A Kelsey