MRI as a complementary tool in motion management for patients undergoing radiation therapy for thoracic tumors

Appropriate selection of the internal margin for mobile tumors is paramount for patients with thoracic tumors in order to adequately direct the radiation dose to the tumor while sparing healthy tissues. In this study, the adequacy of the margins determined with the conventional 4DCT treatment planning images was looked into by comparing the tumor movement quantified with template matching in cine-MRI images to that in 4DCT images. Results from the study show that margins determined with 4DCT are often not enough and MRI can be an important complementary tool in determining margins due to the non-ionizing nature.

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