De Puysseleyr A, Lechner W, De Neve W, Georg D, De Wagter C. Absorbed dose measurements in the build-up region of flattened versus unflattened megavoltage photon beams.
Z Med Phys 2016;
26:177-83. [PMID:
27020966 DOI:
10.1016/j.zemedi.2016.02.005]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 02/24/2016] [Accepted: 02/25/2016] [Indexed: 12/01/2022]
Abstract
This study evaluated absorbed dose measurements in the build-up region of conventional (FF) versus flattening filter-free (FFF) photon beams. The absorbed dose in the build-up region of static 6 and 10MV FF and FFF beams was measured using radiochromic film and extrapolation chamber dosimetry for single beams with a variety of field sizes, shapes and positions relative to the central axis. Removing the flattening filter generally resulted in slightly higher relative build-up doses. No considerable impact on the depth of maximum dose was found.
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