Effects of spot size and spot spacing on lateral penumbra reduction when using a dynamic collimation system for spot scanning proton therapy

Author： Hyer Daniel E   Hill Patrick M   Wang Dongxu   Smith Blake R   Flynn Ryan T  

Publisher： IOP Publishing

ISSN： 0031-9155

Source： Physics in Medicine and Biology, Vol.59, Iss.22, 2014-11, pp. : 187-196

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