Correlation of projection radiographs in radiation therapy using open curve segments and points

摘要: A method for determining differences in patient position between projection radiographs such as those routinely used radiation therapy has been developed. Determination of a transformation relating two permits registration simulation and portal images the transfer information them. The algorithm is based on spatially registering segments open curves or points seen both images, does not require identification corresponding curve endpoints. implemented fast accurate. After user definition to be registered, optimal calculated approximately 1 s. Calculational experiments indicate that are registered better than 2 mm, even when random errors (FWHM mm) digitization included. Experiments clinical (pixel size = 0.5 by an accuracy order mm less translation deg rotation. Analysis brain, thorax, pelvis indicates this robust clinically applicable. rapid accurate potentially important application real time imaging devices therapy.