Feasibility of megavoltage portal CT using an electronic portal imaging device (EPID) and a multi-level scheme algebraic reconstruction technique (MLS-ART)

被引:35
作者
Guan, HQ [1 ]
Zhu, YP [1 ]
机构
[1] St Jude Childrens Res Hosp, Dept Radiat Oncol, Memphis, TN 38105 USA
关键词
D O I
10.1088/0031-9155/43/10/018
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Although electronic portal imaging devices (EPIDs) are efficient tools for radiation therapy verification, they only provide images of overlapped anatomic structures. We investigated using a fluorescent screen/CCD-based EPID, coupled with a novel multi-level scheme algebraic reconstruction technique (MLS-ART), for a feasibility study of portal computed tomography (CT) reconstructions. The CT images might be useful for radiation treatment planning and verification. We used an EPID, set it to work at the linear dynamic range and collimated 6 MV photons from a linear accelerator to a slit beam of 1 cm wide and 25 cm long. We performed scans under a total of similar to 200 monitor units (MUs) for several phantoms in which we varied the number of projections and MUs per projection. The reconstructed images demonstrated that using the new MLS-ART technique megavoltage portal CT with a total of 200 MUs can achieve a contrast detectibility of similar to 2.5% (object size 5 mm x 5 mm) and a spatial resolution of 2.5 mm.
引用
收藏
页码:2925 / 2937
页数:13
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