Combining tissue - phantom ratios to provide a beam - quality specifier for flattening filter free photon
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Combining tissue-phantom ratios to provide a beam-quality specifier for flattening filter free photon beams.
PURPOSE There are currently several commercially available radiotherapy treatment units without a flattening filter in the beam line. Unflattened photon beams have an energy and lateral fluence distribution that is different from conventional beams and, thus, their attenuation properties differ. As a consequence, for flattening filter free (FFF) beams, the relationship between the beam-quality ...
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تاریخ انتشار 2017