TU-D-217A-01: CTDI and Patient Dose: A European Perspective

Medical Physics
W A Kalender

Abstract

Dose in CT has been a dominant topic in Medical Physics for at least a decade. This was for good reason since increasing use of CT necessarily led to an increase of cumulative dose to the population and inappropriate use of CT in some cases led to an unnecessarily high exposure of patients with subsequent coverage in the U.S. media. Fortunately, this situation also triggered a number of positive technical developments and fruitful initiatives worldwide. Currently, even "sub-mSv CT" is a realistic topic. However, we also engage in extensive discussions of the topic "CTDI and patient dose". They do not always seem to be pragmatic and sometimes are unnecessarily complicated. One reason may be that the topics computed tomography dose index (CTDI) and patient dose are seen necessarily combined. This lecture aims at discussing and hopefully helping to resolve some of the issues. Key points and suggestions are the following: • CTDI is a proven and reasonably good concept for scanner dosimetry and quality control (QC) on standard 64-row scanners. There is no major debate on CTDI efficiency and similar issues in Europe. • The new IEC scanner dosimetry concept to be used for wider detectors is acceptable; there is no need for new and hea...Continue Reading

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