Journal Article

Evaluation of Imaging Dose From Different Image Guided Systems During Head and Neck Radiotherapy: A Phantom Study

Chun Shing Cheng, Wei Loong Jong, Ngie Min Ung and Jeannie Hsiu Ding Wong

in Radiation Protection Dosimetry

Volume 175, issue 3, pages 357-362
Published in print July 2017 | ISSN: 0144-8420
Published online December 2016 | e-ISSN: 1742-3406 | DOI: http://dx.doi.org/10.1093/rpd/ncw357
Evaluation of Imaging Dose From Different Image Guided Systems During Head and Neck Radiotherapy: A Phantom Study

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Abstract

This work evaluated and compared the absorbed doses to selected organs in the head and neck region from the three image guided radiotherapy systems: cone-beam computed tomography (CBCT) and kilovoltage (kV) planar imaging using the On-board Imager® (OBI) as well as the ExacTrac® X-ray system, all available on the Varian Novalis TX linear accelerator. The head and neck region of an anthropomorphic phantom was used to simulate patients’ head within the imaging field. Nanodots optically stimulated luminescent dosemeters were positioned at selected sites to measure the absorbed doses. CBCT was found to be delivering the highest dose to internal organs while OBI-2D gave the highest doses to the eye lenses. The setting of half-rotation in CBCT effectively reduces the dose to the eye lenses. Daily high-quality CBCT verification was found to increase the secondary cancer risk by 0.79%.

Journal Article.  2951 words.  Illustrated.

Subjects: Nuclear Chemistry, Photochemistry, and Radiation

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