Optimization of the Exposure Indicator of a Computed Radiography Imaging System as a Radiation Dose Management Strategy

Euclid Seeram

Research output: ThesisDoctoral Thesis

2070 Downloads (Pure)

Abstract

This procedure is based on the reproduction and visualization of defined anatomical structures.Using snowball sampling (non-probability sampling), an online survey questionnaire was administered to 103 diagnostic technologists who routinely perform CR imaging in hospitals in British Columbia (BC).The phantom dosimetry results revealed a strong positive linear relationship between dose and mAs; mAs and inverse EI; and dose and inverse EI for both the AP pelvis and AP lumbar spine. The optimized mAs/EI procedure showed that compared to the reference mAs/EI of 25/86 for the AP pelvis and 50/88 for the AP lumbar spine; 16 mAs with an associated EI of 136; and 20 mAs and an associated EI of 220 for the AP pelvis and AP lumbar spine respectively, were selected by all observers as optimized values.The VGA procedure showed that while the optimized 16 mAs/EI=136 for the AP pelvis did not compromise image quality, the optimized 20 mAs/EI=220 for the AP lumbar spine compromised image quality. Further analysis of the VGA scores (VGAS) showed that for the AP lumbar spine, it was deemed that 32 mAs/EI=139 were optimized values where image quality was not compromised, compared to the vendorŸs recommended values. The selection of the optimized mAs of 16 and 32 for the AP pelvis and AP lumbar spine respectively resulted in a dose reduction of 36% compared to the vendorŸs recommended mAs (dose) values, without compromising image quality.The results of the survey study showed that the response rate was 69%, and that most of the respondents were mostly females above 40 years old, and who indicated that their CR education/training was provided by the vendor for less than 2 hours.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Charles Sturt University
Supervisors/Advisors
  • Swan, Hans, Co-Supervisor
  • Davidson, Robert, Co-Supervisor
  • Bushong, Stewart, Co-Supervisor, External person
Award date11 Mar 2013
Place of PublicationAustralia
Publisher
Publication statusPublished - 2013

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