Radiographic apparatus having repetitive movement of the origin

Details Radiographic apparatus having repetitive movement of the origin Radiographic apparatus having repetitive movement of the origin

1976-09-22

1978-06-27

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

250402, 250445T, G01N 2134, G01N 2304, G01T 120

Patent

active

040977447

ABSTRACT:
Radiographic apparatus is provided to evaluate the absorption coefficient of a body at each of a plurality of locations distributed over a cross-sectional slice of the body of a patient. A source directs a fan-shaped distribution of radiation through the slice and is orbited to direct the radiation from a plurality of directions. Detectors are provided to detect the radiation emergent from the body along a plurality of paths. A lateral can, which may be along a curved path, is superimposed on the source motion. This is arranged so that over a predetermined time period, it substantially cancels the orbital motion to effect a part of a lateral scan and give some parallel paths through the body. Over several time periods there can be erected a full set of beam paths which not only partly overlap to give comparison of detector sensitivities but also provide the parallel set which although not essential is useful for the convolution processing.

REFERENCES:
patent: 4010370 (1977-03-01), LeMay

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