H - Electricity – 05 – G
Patent
H - Electricity
05
G
358/11.2
H05G 1/08 (2006.01) A61B 6/00 (2006.01)
Patent
CA 1047656
ABSTRACT A system for examining a body through the use of X-rays or other penetrating radiation includes a means for moving a beam of radiation over a body to be examined and a detector for detecting the intensity of the non-absorbed or body-exiting portion of the beam. The system is formed into a dynamic closed loop by comparing the detected beam intensi- ty with a given reference signal and utilizing the error sig- nal so obtained to dynamically vary the body-incident inten- sity, or body-incident intensity and wavelength, of the beam in such a manner as to hold the detected intensity at a con- stant value. With the detected intensity held constant, the control signal which dictates the body-incident intensity, or body-incident intensity and wavelength, of the beam becomes a function of the transmissivity of that portion of the body through which the path of the beam instantaneously passes. As the beam is scanned over the body, the beam control signal is supplied to a computer or other utilization device which ex- tracts transmissivity data therefrom and processes such data to compose a pictorial or other graphic display.
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