Abstract #1240

Brain and head-and-neck MRI in immobilization masks: a novel and practical setup for radiotherapy

Stefano Mandija^1,2, Federico D'Agata^1,2,3, Robin J.M. Navest^1,2, Alessandro Sbrizzi^1,2, Cornelis P.J. Raaijmakers^1,2, Rob H.N. Tijssen^1,2, Marielle E.P. Philippens^1,2, Enrica Seravalli¹, Joost J.C. Verhoeff¹, Jan J.W. Lagendijk^1,2, and Cornelis A.T. van den Berg^1,2

¹University Medical Center Utrecht, Utrecht, Netherlands, ²Utrecht University, Utrecht, Netherlands, ³University of Turin, Turin, Italy

For radiotherapy treatment planning, it is essential to perform the MRI/CT exams in treatment position. For this purpose, thermoplastic immobilization masks are used for brain and head-and-neck radiotherapy. However, since standard immobilization masks do not fit in the diagnostic MR head/neck coils, suboptimal surface-loop coils leading to poor image quality are used in clinical practice. Here, we present a new immobilization setup. This setup has several advantages compared to state-of-the-art setups: it fits in the diagnostic head/neck MR coils, it allows diagnostic image quality in treatment position, high SNR, homogenous signal, restricted motion (about 1 mm) and accurate inter-fraction repositioning.

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