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Radiation Protection Dosimetry Advance Access published online on December 13, 2008
Radiation Protection Dosimetry, doi:10.1093/rpd/ncn305
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

COMPARISON OF RADIATION DOSES BETWEEN CONE BEAM CT AND MULTI DETECTOR CT: TLD MEASUREMENTS

Sangroh Kim1, Terry T. Yoshizumi2,*, Greta Toncheva2, Sua Yoo3 and Fang-Fang Yin3

1 Medical Physics Graduate Program, Duke University, Durham, NC 27705, USA
2 Department of Radiology, Duke University Medical Center, Durham, NC 27710, USA
3 Deparment of Radiation Oncology, Duke University Medical Center, Durham, NC 27710, USA

* Corresponding author: yoshi003{at}mc.duke.edu

Received September 8, 2008, amended November 18, 2008, accepted November 20, 2008

In recent years, wide beam computed tomography (CT) technique has become standard in radiation oncology whereas there is little information about radiation dose assessments for the technique. A point dose measurement method was employed to assess the radiation doses of cone beams CT (CBCT) and multi detectors CT (MDCT). The radiation doses of both modalities were measured using thermoluminescence dosemeters (TLDs) in head and body CT phantoms. Four TLD chips were placed at the centre and each peripheral channel to measure the doses. From the measurements, the weighted CT dose index for CBCT (CTDIwCBCT) and volume CT dose index for MDCT (CTDIvolMDCT) were derived. In the results, the CTDIwCBCT was 89.7 ± 4.0 mGy and the CTDIvolMDCT was 137.0 ± 7.4 mGy for the head scan. For the body scan, they were 37.9 ± 1.4 and 74.3 ± 5.3 mGy, respectively. In conclusion, CTDIwCBCT for the head scan was 35% lower than CTDIvolMDCT, and CTDIwCBCT for the body scan was also 49% lower than CTDIvolMDCT.


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