Adjustment of Lateral and Longitudinal Size of Scanned Proton–beam Spots Using a Pre-Absorber
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U Titt1 *, D Mirkovic1 , G Sawakuchi2 , L Perles1 , W Newhauser1 , P Taddei1 , R Mohan1 , (1) MD Anderson Cancer Center, Houston, TX, (2) Carlton University, Ottawa, ON, CA