Patient-specific kerma-area product as an exposure estimator in computed tomography: the concept and typical values
2011 (English)In: IAEA, International Symposium on Standards, Applications and Quality Assurance in Medical Radiation Dosimetry (IDOS). 9-12 november 2010, Vienna, Austria. Book of extended synopses. IAEA-CN-182 / [ed] IAEA, International Atomic Energy Agency, Vienna: IAEA , 2011, 83-92 p.Conference paper (Refereed)
Monitoring of exposure levels in computed tomography is important from the radiation safety point of view. In this article, the concept suggested by Huda XX of using the patient-specific kerma-area product as an exposure estimator is extended by providing both a rigorous definition of this quantity and a method for its evaluation. The method was demonstrated on an axial scan of the standard CT dosimetry head phantom taken with a Siemens Somatom Open CT scanner. The resulting patient-specific kerma-area product was 0.25 Gy cm2 for the x-ray tube voltage of 120 kV, tube current of 100 mA, scanning time of 1 s, and beam width at the iso-center of 1.2 cm. To implement this method, the CT scanner must be equipped with a KAP meter, and the calculation procedure must be added to the scanner's software. Alternatively, the patient-specific kerma-area product can be calculated by the CT scanner without using a KAP meter. In this case, however, the extra safety feature provided by the direct monitoring of the x-ray beam by the KAP meter is lost.
Place, publisher, year, edition, pages
Vienna: IAEA , 2011. 83-92 p.
, International Atomic Energy Agency, ISSN 0074–1884 ; Vol. 2
Radiology, Nuclear Medicine and Medical Imaging
IdentifiersURN: urn:nbn:se:liu:diva-68299ISBN: 978–92–0–116210–6OAI: oai:DiVA.org:liu-68299DiVA: diva2:417774
International Symposium on Standards, Applications and Quality Assurance in Medical Radiation Dosimetry (IDOS). 9-12 november 2010, Vienna, Austria.