Method and apparatus for examining a body by a beam of X-rays or

Details Method and apparatus for examining a body by a beam of X-rays or Method and apparatus for examining a body by a beam of X-rays or

1975-08-04

1977-06-28

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

250445T, G01J 142

Patent

active

040327841

ABSTRACT:
A system for examining a body through the use of X-rays or other penetrating radiation includes a means or 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 intensity with a given reference signal and utilizing the error signal so obtained to dynamically vary the body-incident intensity, or body-incident intensity and wavelength, of the beam in such a manner as to hold the detected intensity at a constant 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 extracts transmissivity data therefrom and processes such data to compose a pictorial or other graphic display.

REFERENCES:
patent: 3906233 (1975-09-01), Vogel
patent: 3924131 (1975-12-01), Hounsfield

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