Method of and an apparatus for examining a sample or a material

Details Method of and an apparatus for examining a sample or a material Method of and an apparatus for examining a sample or a material

1974-05-10

1976-03-16

Borchelt, Archie R.

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

250308, G01N 2302

Patent

active

039448304

ABSTRACT:
A method of and an apparatus for human bone density determination in vivo. .gamma.- or x-ray radiation of two different photon energies is scanned across the human body part to be examined. For the two photon energies, the logarithms of the intensities of the radiation transmitted through the human body part are determined simultaneously. The logarithm values obtained are processed on line such that the ratio of these values is changed by a predetermined factor. The processed values are subtracted from each other to produce a simultaneous output value which is integrated to give an examination result proportional to the bone tissue content expressed as weight per length unit in a direction perpendicular to the scanning direction while being independent of the surrounding soft tissue.

REFERENCES:
patent: 2884535 (1959-04-01), Swift, Jr.
patent: 3432657 (1969-03-01), Slavin
patent: 3529151 (1970-09-01), Carr-Brion
patent: 3778614 (1973-12-01), Hounsfield

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