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	Intrafractional tracking of radiation therapy using image feature points instead of fiducial markers
	Yaoqin Xie; Wu Liu
	2013
会议名称	World Congress on Medical Physics and Biomedical Engineering
会议地点	Beijing, China
英文摘要	Fiducial markers are widely used in the radiotherapy for tumor tracking, however, they are invasive, and do not certainly achieve the high accuracy. The aim of this study is to develop a non-invasive method to substitute the role of fiducial markers in the radiotherapy. The technique starts with auto-detection of a number of corresponding points with distinct tissue features. The feature point pairs are then matched using the Scale Invariant Feature Transform (SIFT). The amplitude and orientation of the tumor motion were determined from the coordinate difference of the homologous feature points. The performance of the proposed technique was evaluated by a thoracic phantom and archived clinical cases. Sub 2-mm tracking error can be achieved in all the 3 directions. In the clinical tests, the p-values of the correlation curves between feature point tracking and fiducial tracking are less than 0.0001, which shows close relationship between these two tracking methods. The technique is non-invasive and no hardware requirement. It is potentially useful for various image-guided radiation therapy (IGRT) systems.
收录类别	EI
语种	英语
内容类型	会议论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/5027]
专题	深圳先进技术研究院_医工所
作者单位	2013
推荐引用方式 GB/T 7714	Yaoqin Xie,Wu Liu. Intrafractional tracking of radiation therapy using image feature points instead of fiducial markers[C]. 见:World Congress on Medical Physics and Biomedical Engineering. Beijing, China.

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