Performance evaluation of diagnostic radiology dosimeters in clinical and calibration x-ray beams.

Abstract:

:Diagnostic radiology dosimeters should comply with International Electrotechnical Commission (IEC) 61674 standard in order to perform measurements with sufficient accuracy and reliability. The calibration of a dosimeter is performed under, and pertains to, reference conditions. However, in most cases, dosimeters are used for clinical measurements under non-reference conditions. The performance, in terms of accuracy of dose measurements, of six commercial diagnostic radiology dosimeters was tested at reference calibration and at clinical non-reference conditions. The results showed that all dosimeters being tested exhibited limits of variation within the +/-5% IEC limits. Depending on the detector's physical and operational properties, the dosimeters' energy dependence of response values varied from -4.7% to +4.2%. To address this variation of response, calibration at three radiation qualities (RQR 3, RQR 5, and RQR 9), at least, is recommended. Different irradiation conditions such as air kerma rate, x-ray tube design, x-ray system, and dosimeter operational modes affect the dosimeters' response by less than 3%. A dosimeter that complies with IEC standards and operates according to its specifications could be used at typical clinical irradiation conditions taking into account only corrections for the energy dependence of response. In this case, the error in dose accuracy is expected to be less than 3%.

journal_name

Health Phys

journal_title

Health physics

authors

Hourdakis CJ,Boziari A,Manetou A

doi

10.1097/HP.0b013e3181d18d45

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

704-16

issue

5

eissn

0017-9078

issn

1538-5159

pii

00004032-201005000-00005

journal_volume

98

pub_type

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