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Radiation Protection Dosimetry 2005 114(1-3):326-331; doi:10.1093/rpd/nch571
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Phantom studies for possible dose reduction in CT head procedures

Maria A. Staniszewska1,*, Marzanna Obrzut2 and Krzysztof Rybka3

1 Nofer Institute of Occupational Medicine, Lodz, Poland
2 Regional Special Hospital, Rzeszow, Poland
3 Polish Mother's Memorial Hospital–Research Institute, Lodz, Poland

* Corresponding author: mastan{at}imp.lodz.pl

This paper presents the results of phantom studies to investigate possible dose reduction in relation to image quality in head examinations. The studies were performed using five single-slice computed tomography (CT) scanners. Beginning from the manufacturer's protocols (i.e. default protocols in the scanner software) for routine head (adult) examinations, the values of kVp, anode current and time were modified. Low-contrast resolution and spatial resolution were controlled using a Catphan 424 phantom. Radiation dose was checked using a polymethylmethacrylate phantom and a pencil ionisation chamber. It was found that CT dose index may be reduced up to three times with practically no loss of image quality.


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