Abstract #0292
MRI as a complementary tool in motion management for patients undergoing radiation therapy for thoracic tumors
Xiutao Shi 1 , Tejan Diwanji 1 , Jolinta Lin 1 , Warren D. D'Souza 1 , and Nilesh N. Mistry 1
1
Department of Radiation Oncology, University
of Maryland School of Medicine, Baltimore, MD, United
States
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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