Correction of wobble effect of a filter mounted on on-board-imager

摘要：

　　Intensity-weighted region-of-interest (IW ROI) imaging is a technique that uses X-ray illumination with two different beam intensities by mounting an intensity-weighting filter in front of the X-ray outlet.The IW ROI imaging method is a viable approach to reducing radiation dose to a patient.However,there may be potential technical problems related to a gantry motion.We mounted an intensity-weighting filter on the on-board-imager (OBI) of a Varian system,and found a wobble of the filter image in the X-ray projections.The wobble is thought to be due to gantry sagging and additional mechanical vibrations of the X-ray tube housing during the gantry rotation.The unpredictable wobble of the filter will cause image artifacts in the reconstructed image.In this work,we developed an algorithm for correcting the wobble effect by minimizing the variance of the processed data.

关键词： Intensity-weighted region-of-interest Conebeam CT filter wobble

作者: Boyeol Yoo Jinsung Kim Seungryong Cho

作者单位: Department of Nuclear and Quantum Engineering, KAIST, Deajeon, Korea Samsung Medical Center, Seoul, Korea

会议类型: 国际会议

会议名称: World Congress on Medical Physics and Biomedical Engineering (2012年医学物理及生物医学工程国际会议(IFMBE))

会议地点: 北京

会议语种:英文

页码: 858-859

在线出版日期: 2012-05-26（万方平台首次上网日期，不代表论文的发表时间）