Abstract
A feasibility study of Dynamic Phantom scanner for quality assurance of photon beam profiles at various gantry angles
Highlights
There are many advantages associated with the use of a multileaf collimator[1] (MLC), including enhanced precision and ease of dose conformality to designated targets, and protection of critical normal organs and tissues for both 3D conformal and intensity-modulated radiation therapy
Based on quantitative comparisons of photon/electron beam profiles at different gantry angles, we evaluate the suitability of the Dynamic Phantom scanner to determine the effect of gantry rotation on beam profiles in routine quality assurance (QA)
Results obtained by comparing the scanned profiles just inside of the field edges for both 6 MV and 18 MV at 5 cm depth of Lucite gave good agreement (
Summary
There are many advantages associated with the use of a multileaf collimator[1] (MLC), including enhanced precision and ease of dose conformality to designated targets, and protection of critical normal organs and tissues for both 3D conformal and intensity-modulated radiation therapy. By dividing the MLC QA process into routine LINAC-based and patient-specific components, the challenge of MLC QA is more readily approached. During patient-specific dosimetric verification, the calculated dose distribution for each treatment field with reassigned 0 ̊ gantry angle can be verified against one measured from film or MAPCHECK, a diode-based dose measurement device available in many institutions, including our own. In this verification approach, one assumes that dose profiles and output factors for each treatment field do not vary with gantry angle. It is essential to consider and measure the gantry-angle-dependent dosimetric variation
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