Abstract
<h2>Abstract</h2><h3>Purpose:</h3> To compare the measured radiographic entrance surface dose with thatobtained by calculation based on routine quality assurance (QA) measurements. To devise a computer-based system by which radiographers can determine patient doses from exposure factors recorded at the time of examination and compare the results with national reference levels. <h3>Methods:</h3> Patient doses were measured using thermoluminescent dosemeters(TLD) and the results compared with those obtained by calculation for the same patients. A computer program was written to enable dose calculation to be performed by radiographers using a departmental personal computer (PC). <h3>Results:</h3> The agreement between doses determined by the two methods iswithin ± 20% except for chest examinations. The computer program has been successfully used by radiographers to survey patient doses. <h3>Conclusion:</h3> Calculation, based on QA measurements, is a viable alternative todirect patient measurement. Once installed, the computer program can be used for routine dose audit for large numbers of patients.
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