Radiography apparatus with photocell drift compensating means

Details Radiography apparatus with photocell drift compensating means Radiography apparatus with photocell drift compensating means

1975-01-23

1978-01-31

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

250445T, G01T 120

Patent

active

040717607

ABSTRACT:
In an apparatus for examining a body by means of penetrating radiation a source is arranged to direct radiation through the body and a plurality of detectors are arranged to receive it thereafter. The source and detector are arranged to scan the body to obtain data for use in obtaining a distribution of absorption of the radiation for part of the body. For correction for differences in the relative sensitivities of the detectors they are arranged in pairs to examine radiation along substantially identical paths and for correction for drift each detector is caused to examine a substantially identical path at different times.

REFERENCES:
patent: 3778614 (1973-12-01), Hounsfield
patent: 3780290 (1973-12-01), Hoffer
patent: 3784820 (1974-01-01), Miraldi
patent: 3808440 (1974-04-01), Petit-Clerc
patent: 3852611 (1974-12-01), Cesar
patent: 3940625 (1976-02-01), Hounsfield

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