A portal image alignment and patient setup verification procedure using moments and correlation techniques.
作者： Lei Dong , Arthur L Boyer
DOI: 10.1088/0031-9155/41/4/008
关键词:
摘要: The objective of this study was to develop an integrated field shape and patient setup verification procedure for portal images. proposed used one the approved images as reference image automated comparison with subsequent first step a moments method align treatment boundaries. This necessary compensate repositioning error detector create common frame comparing anatomical shifts relative boundary. At end alignment, figure merit computed compared pre-established threshold. verified whether there potential change in field. To measure misalignment, last use grey-scale correlation translations in-plane rotations anatomy image. shown phantom studies err by less than 1 mm when detecting translational degree detection rotations. showed sensitivity placement 6 single leaf controlled experiment where multileaf collimator shaping. alignment fast could be done 12 s on IBM-compatible 486 personal computer.
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