Radiant energy – Calibration or standardization methods
Patent
1980-11-18
1982-10-19
Smith, Alfred E.
Radiant energy
Calibration or standardization methods
250394, 364414, G01D 1800, G01J 142, G06F 1542, G12B 1300
Patent
active
043552307
ABSTRACT:
An improved method and apparatus for accurately measuring the applied kilovoltage (KV) of an X-ray source over a wide dynamic operating range. A pair of radiation detectors are mounted beneath a rotatable disc having disposed thereon a plurality of metallic absorbers. To measure applied KV, two exposures are required. In the first exposure, called the "calibration" exposure, the detectors are filtered by two absorbers of equal thickness (t.sub.1) and the detected X-ray intensities are measured, processed, and stored in a digital memory. In the second X-ray exposure, referred to the "measure" exposure, the filter wheel is automatically advanced so that one detector is filtered by an absorber of thickness (t.sub.1) and the second detector is filtered by an absorber of thickness (t.sub.2). The detected X-rays are gain measured and the ratio of the signals calculated to determine the relative penetrating energy. The data from the second measurement is then modified in accordance with the data from the calibration exposure before applied KV is derived to correct for gain differences in the detectors and associated electronics as well as for any nonuniformities in the radiation striking the detectors. Offset errors and drifts in the electronics are also automatically compensated for.
REFERENCES:
patent: 4189645 (1980-02-01), Chaney et al.
Joseph Peter M.
Wilson Stephen S.
Grigsby T. N.
Smith Alfred E.
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