%0 Journal Article
%T Development of a real-time internal and external marker tracking system for particle therapy: a phantom study using patient tumor trajectory data.
%A Cho J
%A Cheon W
%A Ahn S
%A Jung H
%A Sheen H
%A Park HC
%A Han Y
%J J Radiat Res
%V 58
%N 5
%D Sep 2017 1
%M 28201522
%F 2.438
%R 10.1093/jrr/rrw131
%X 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.