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Title
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Quality assurance of a system for improved target localization and patient set-up that combines real-time infrared tracking and stereoscopic X-ray imaging
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Author
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Abstract
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| Background and purpose: The aim of this study is to investigate the positional accuracy of a prototype X-ray imaging tool in combination with a real-time infrared tracking device allowing automated patient set-up in three dimensions. Material and methods: A prototype X-ray imaging tool has been integrated with a commercially released real-time infrared tracking device. The system, consisting of two X-ray tubes mounted to the ceiling and a centrally located amorphous silicon detector has been developed for automated patient positioning from outside the treatment room prior to treatment. Two major functions are supported: (a) automated fusion of the actual treatment images with digitally reconstructed radiographs (DRRs) representing the desired position; (b) matching of implanted radio opaque markers. Measurements of known translational (up to 30.0 mm) and rotational (up to 4.0degrees) set-up errors in three dimensions as well as hidden target tests have been performed on anthropomorphic phantoms. Results: The system's accuracy can be represented with the mean three-dimensional displacement vector, which yielded 0.6 mm (with an overall SD of 0.9 mm) for the fusion of DRRs and X-ray images. Average deviations between known translational errors and calculations varied from - 0.3 to 0.6 mm with a standard deviation in the range of 0.6-1.2 mm. The marker matching algorithm yielded a three-dimensional uncertainty of 0.3 rum (overall SD: 0.4 mm), with averages ranging from 0.0 to 0.3 mm and a standard deviation in the range between 0.3 and 0.4 turn. Conclusions: The stereoscopic X-ray imaging device integrated with the real-time infrared tracking device represents a positioning tool allowing for the geometrical accuracy that is required for conformal radiation therapy of abdominal and pelvic lesions, within an acceptable time-frame. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved. |
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Language
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English
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Source (journal)
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Radiotherapy and oncology. - Amsterdam
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Publication
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Amsterdam
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2003
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ISSN
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0167-8140
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DOI
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10.1016/S0167-8140(02)00385-7
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Volume/pages
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67
:1
(2003)
, p. 129-141
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ISI
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000183349500016
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Full text (Publisher's DOI)
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