Ontology highlight
ABSTRACT:
SUBMITTER: Grafe J
PROVIDER: S-EPMC5875524 | biostudies-literature | 2014 Jul
REPOSITORIES: biostudies-literature
Gräfe James J Poirier Yannick Y Jacso Ferenc F Khan Rao R Liu Hong-Wei HW Villarreal-Barajas J Eduardo JE
Journal of applied clinical medical physics 20140708 4
In this report, we quantify the divergence from the inverse square law (ISL) of the beam output as a function of distance (standoff) from closed-ended applicators for a modern clinical orthovoltage unit. The divergence is clinically significant exceeding 3% at a 1.2 cm distance for 4 × 4 and 10 × 10 cm2 closed-ended applicators. For all investigated cases, the measured dose falloff is more rapid than that predicted by the ISL and, therefore, causes a systematic underdose when using the ISL for d ...[more]