A commonly and easily measured or determined radiation metric (e.g. Ka,e, Ka,i, CTDIvol, DLP, PKA, Ka,r, DG, administered activity) that assesses the amount of ionising radiation used to perform a medical imaging task. The quantity or quantities selected are those that are readily available for each type of medical imaging modality and medical imaging task. With the single exception of mean breast glandular dose for mammography these quantities are not the tissue or organ doses received by the patient or quantities derived from such doses as these doses cannot be measured or determined easily.
(from ICRP Publication 135, 2017)
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