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Proceedings Paper

Correlation identification between internal/external motion signals
Author(s): Huanmei Wu; Qingya Zhao; Ross Berbeco; Seiko Nishioka; Hiroki Shirato; Steve B. Jiang
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Paper Abstract

Tumor motion induced by patient breathing decreases the effectiveness of radiation treatment. Image guided radiation treatment (IGRT) is an advanced approach for cancer radiation treatment. The success of IGRT is largely dependent on the accurate localization of tumor in real-time. There are two major imaging approaches currently in use to localize a tumor: internal imaging and external imaging. Internal imaging determines the tumor locations by directly x-ray of the tumor area. It is accurate however radiation dose is a big concern. External imaging derives the internal tumor locations through an external mark on the patient surface. It is radiation dose free however the insufficient accuracy limits its wide application. Integrating the internal and external signals together is necessary for reliable radiation treatment and acceptable patient radiation exposure. Our work tries to identify the correlation patterns between internal/external signals and the influential factors so that the hybrid signal will give desire accuracy in dose delivery while limiting radiation exposure to the patients. Both theoretical simulation based on sinusoidal functions and statistical analysis on real patient data are performed. The sinusoidal simulation will identify the potential influence factors of different correlation conditions. The results have demonstrated the various correlation patterns with amplitude various, frequency changes (duration changes), phase shifts, and baseline drift. The results will aid the statistical analytical on real-patients to identify the dominant factors of the internal/external motion signals for a specific patients. The described work is very useful in advanced IGRT to update the internal/external correlation in real-time for better cancer patient care.

Paper Details

Date Published: 18 March 2008
PDF: 10 pages
Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 69131P (18 March 2008); doi: 10.1117/12.773995
Show Author Affiliations
Huanmei Wu, Indiana Univ.-Purdue Univ. Indianapolis (United States)
Qingya Zhao, Purdue Univ. (United States)
Ross Berbeco, Dana-Farber/Brigham and Women's Cancer Ctr. and Harvard Medical School (United States)
Seiko Nishioka, NTT East-Japan Sapporo Hospital (Japan)
Hiroki Shirato, Hokkaido Univ. Graduate School of Medicine (Japan)
Steve B. Jiang, Univ. of California/San Diego (United States)

Published in SPIE Proceedings Vol. 6913:
Medical Imaging 2008: Physics of Medical Imaging
Jiang Hsieh; Ehsan Samei, Editor(s)

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