High-resolution dose profile studies based on MR Imaging with polymer BANGTM gels in stereotactic radiation techniques

High-resolution dose profiles produced by the Leksell Gamma Knife were obtained in BANGTM polymer gel, using a 3 T whole-body scanner upgraded by a magnetic resonance microscopy unit. The gel was contained in 22.3 mm diameter flasks that were inserted into a solid, tissue-equivalent head phantom irradiated by fields of by 8 and 14 mm collimators. Dose profiles were obtained from a linear dose-response curve (R2 vs. Dose). Excellent agreement was obtained when the gel data were compared to film dosimetry and calculated data.