11/3/2023 0 Comments Pencil 2d onlineA feature among measurements that remained sub-optimal after re-analysis was a sharp >3% per mm lateral dose gradient that may not be well handled using the detector size of 5.0 mm in-diameter. By utilizing this 3D toolkit, 43.1% of the failed measurements were improved. We utilized a 2D/three-dimensional (3D) gamma index analysis toolkit to investigate the effect of depth dose gradient. A criterion to fail a PBS-QA measurement is having a 94%, 94 to >88%, and 3% per mm dose gradient with respect to depth on the failed measurements. The aim of this report is to present the root cause analysis on failed patient-specific quality assurance (QA) measurements of pencil beam scanning (PBS) protons referred to as PBS-QA measurement.
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