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Abstract #5305

Optimizing Brain Imaging Protocols: Advanced Acquisition Techniques for Radiotherapy with Immobilization Masks

Noemie delivert1, Virginie le merlus2, christophe geran2, and najma douir3
1Radiotherapy, Gustave Roussy, thiais, France, 2Radiotherapy, Gustave Roussy, villejuif, France, 3Gustave Roussy, villejuif, France

Synopsis

Motivation: MRI is crucial for brain tumor radiotherapy planning, registered with CT for dose calculation. Using a custom thermoplastic mask during MRI improves targeting but limits the use of the standard head coil.

Goal(s): This study aims to optimize MRI image quality for radiotherapy with the thermoplastic mask by testing different coil configurations.

Approach: Various coil setups were tested, combining 4- and 18-channel coils. Each configuration was evaluated by a radiation oncologist and physicist, focusing on signal-to-noise ratio and spatial resolution.

Results: The best image quality was achieved with the combination of 4 FS and 18 UFL coils, which was adopted for clinical use.

Impact: The radiotherapy mask during brain MRI renders the head coil unusable. This work significantly improved image quality with a custom setup: a 4-channel Flex coil at the back and an 18-channel UltraFlex coil around the top of the patient’s head.

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