The Application of 2D/3D Rigid Image Registration in Tumor Radiation Treatment Planning
Wenting Lu · Zhongguo yixue wulixue zazhi · 2011
Objective: The technique of 2D/3D rigid image registration is critical to ensure accurately positioning of patients in radiation therapy.Methods: Digitally reconstructed radiographs(DRRs) played the most important pole in 2D/3D registration,which affected the registration efficiency in some way.On the basis of special researches about DRRs,the authors realized a fast DRRs algorithm based on Bresenham method.Various 2D/3D registration experiments were carried out on abdomen CT volume data.Mutual information,Pattern Intensity,Gradient Difference and Powell-Brent algorithm were used as similarity measurement and search strategy in the experiments,respectively.Results: In DRRs algorithms,compared with the two other methods,Bresenham method has time of 0.467 s.In 2D/3D image registration experiment,the results of three similarities are compared.MI and GD have an excellent performance;however,there are some problems in PI's experiment.Conclusions: The results show that the registration algorithm utilizing Bresenham method to generate DRRs has a great accuracy,however,with an unendurable computation time.