Development of a real-time internal and external marker tracking system for particle therapy: A phantom study using patient tumor trajectory data

Target motion-induced uncertainty in particle therapy is more complicated than that in x-ray therapy,requiring more accurate motion management. therefore,a hybrid motion-tracking system that can track internal tumor motion and as well as an external surrogate of tumor motion was developed. recently,many correlation tests between internal and external markers in x-ray therapy have been developed; however,the accuracy of such internal/external marker tracking systems,especially in particle therapy,has not yet been sufficiently tested. in this article,the process of installing an in-house hybrid internal/external motion-tracking system is described and the accuracy level of tracking system was acquired. our results demonstrated that the developed in-house external/internal combined tracking system has submillimeter accuracy,and can be clinically used as a particle therapy system as well as a simulation system for moving tumor treatment. © 2017 the author.