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Abstract #1240

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

Stefano Mandija1,2, Federico D'Agata1,2,3, Robin J.M. Navest1,2, Alessandro Sbrizzi1,2, Cornelis P.J. Raaijmakers1,2, Rob H.N. Tijssen1,2, Marielle E.P. Philippens1,2, Enrica Seravalli1, Joost J.C. Verhoeff1, Jan J.W. Lagendijk1,2, and Cornelis A.T. van den Berg1,2

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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