 Μαγνέτικα ρεζόνουσή ηματζήν is increasingly used for brain or a head and neck radiotherapy treatment planning but the thermoplastic masks used for patient immobilization don't fit inside the diagnostic head and neck MR receiving coils. A commercial solution for gymming scanners involves attaching two flex large four coils inside the holder which is placed in the head recess of the scanner couch. The flat tabletop and the board with the mask are placed on top of the holder and the coils are closed over the mask. We propose a custom solution by attaching two ultra flex large 18 coils and placing them in the head recess of the scanner couch. We use a slightly modified tabletop. We place the board with the mask on top and close the coils over the mask. But which flexible coil setup offers the best imaging quality? To find out, we have scanned 5 healthy volunteers in the flexible coil arrangements using mobilization masks and in the diagnostic head and neck coil without immobilization using a T1 and a T2 weighted turbo spin echo and a short tough inversion recovery sequence from the clinical protocols. A qualitative evaluation was performed by clinicians reviewing the images for treatment planning stability. Images were quantitatively evaluated by calculating signal and contrast noise ratio and artifact size for its use of interest along the head. In addition, the ICL phantom was scanned in the three coil setups monthly over two years using the two ICR sequences and the three clinical sequences which were applied on the volunteers. Image quality parameters were calculated according to ICR recommendations and specific absorption rate estimations were obtained from the diagram headers. Comparisons of ratios of image quality parameters obtained with each flexible coil over those obtained with diagnostic head and neck coil showed lower ghosting and higher contrast SNR and uniformity with a custom than with a commercial coil setup for the clinical series on the ICR phantom. Volunteer comparisons confirmed that the UFL18 provided higher SNR and it was also more spacious and perceived as less claustrophobic than the commercial level 4 coil setup. The ultra flex large 18 coil setup was thus selected for clinical implementation in brain and head and neck MR simulations. Ευχαριστώ για την εξεγραφή. Για τελευταίες εξεγραφές πραγματικά δείχνω το παιχνίδι μας και εξεγραφήσω την εξεγραφία αν έχετε εξεγραφία.