Absorbed dose measurements in the build-up region of flattened versus unflattened megavoltage photon beams

作者：De Puysseleyr Annemieke^*; Lechner Wolfgang; De Neve Wilfried; Georg Dietmar; De Wagter Carlos

来源：Zeitschrift für Medizinische Physik, 2016, 26(2): 177-183.

DOI：10.1016/j.zemedi.2016.02.005

• Flattening filter-free
• build-up dose
• surface dose

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 10 MV 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.

• 出版日期2016