Fan beam CT scanner with compensating detector motion

Details Fan beam CT scanner with compensating detector motion Fan beam CT scanner with compensating detector motion

1977-01-05

1983-11-22

Church, Craig E.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 19, G03B 4116

Patent

active

044173539

ABSTRACT:
In fan beam X-ray scanners operating with a large number of detectors, errors at and near the center of rotation are caused by the fact that the radiation absorption in said area is substantially always measured by the same detectors and that the sensitivity of all detectors is not exactly the same. The invention provides an improvement in that the measurement is carried out with a larger number of detectors than is necessary for the measurement of the scanning field and that the detectors pivot during the measurement. As a result, the absorption in the center of rotation is measured by different detectors so that, for a sufficient number of detectors the different sensitivities, errors are averaged and thus reduced or cancelled.

REFERENCES:
patent: 3778614 (1973-12-01), Hounsfield
patent: 3934142 (1976-01-01), Hounsfield
patent: 3983399 (1976-09-01), Cox
patent: 4002917 (1977-01-01), Mayo
patent: 4010370 (1977-03-01), Le May
patent: 4057725 (1977-11-01), Wagner

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