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Proceedings Paper

Patient- and cohort-specific dose and risk estimation for abdominopelvic CT: a study based on 100 patients
Author(s): Xiaoyu Tian; Xiang Li; W. Paul Segars; Donald P. Frush; Ehsan Samei
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Paper Abstract

The purpose of this work was twofold: (a) to estimate patient- and cohort-specific radiation dose and cancer risk index for abdominopelvic computer tomography (CT) scans; (b) to evaluate the effects of patient anatomical characteristics (size, age, and gender) and CT scanner model on dose and risk conversion coefficients. The study included 100 patient models (42 pediatric models, 58 adult models) and multi-detector array CT scanners from two commercial manufacturers (LightSpeed VCT, GE Healthcare; SOMATOM Definition Flash, Siemens Healthcare). A previously-validated Monte Carlo program was used to simulate organ dose for each patient model and each scanner, from which DLP-normalized-effective dose (k factor) and DLP-normalized-risk index values (q factor) were derived. The k factor showed exponential decrease with increasing patient size. For a given gender, q factor showed exponential decrease with both increasing patient size and patient age. The discrepancies in k and q factors across scanners were on average 8% and 15%, respectively. This study demonstrates the feasibility of estimating patient-specific organ dose and cohort-specific effective dose and risk index in abdominopelvic CT requiring only the knowledge of patient size, gender, and age.

Paper Details

Date Published: 9 March 2012
PDF: 10 pages
Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83131R (9 March 2012); doi: 10.1117/12.913341
Show Author Affiliations
Xiaoyu Tian, Duke Univ. Medical Ctr. (United States)
Xiang Li, Duke Univ. Medical Ctr. (United States)
W. Paul Segars, Duke Univ. Medical Ctr. (United States)
Donald P. Frush, Duke Univ. Medical Ctr. (United States)
Ehsan Samei, Duke Univ. Medical Ctr. (United States)


Published in SPIE Proceedings Vol. 8313:
Medical Imaging 2012: Physics of Medical Imaging
Norbert J. Pelc; Robert M. Nishikawa; Bruce R. Whiting, Editor(s)

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