title: The calibration of dosimetry instruments used in interventional radiology.
abstract: No general agreement about the definition of the patient dose exists. As regards the radiation health risk, the doses to specific organs, Hi, are the ultimate measures for a patient dose. Values of the calibration measured, Hi, are provided only by calculational means. Out of the whole process of patient dose determination, the instruments to measure X ray spectra, FSD, field dimensions and Ka can be calibrated, X ray quality is derived from the total filtration and kV value. The actual dynamic and X ray quality ranges shall be considered when air kerma and DAP meters are calibrated. A DAP meter measurement averages the uniform radiation field specific for the X ray tube assembly used and for the beam shaping technique performed. Therefore, a DAP meter calibrated on site is preferable for patient dosimetry in interventional radiology.
authors.affiliation: Institute of Biomedicine, University of Helsinki, PO Box 8, FIN-00014 Helsinki, Finland. simo.rannikko@kolumbu.fi
authors.forename: S
authors.initials: S
authors.lastname: Rannikko
mesh_terms: D002138:Calibration; D006801:Humans; D011829:Radiation Dosage; D015641:Radiography, Interventional; D011874:Radiometry / Q000295:instrumentation* / Q000592:standards