Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleImpact of range shifter material on proton pencil beam spot characteristics.AuthorsShen, Jiajian; Liu, Wei; Anand, Aman; Stoker, Joshua B.; Ding, Xiaoning; Fatyga, Mirek; Herman, Michael G.; Bues, MartinPublicationMedical Physics, 2015, Vol 42, Issue 3, p1335ISSN0094-2405Publication typeArticleDOI10.1118/1.4908208