2D IMRT QA passing rate dependency on coronal plane

Joseph V. Panetta, Iavor Veltchev, Robert A. Price, C. M.Charlie Ma

Research output: Contribution to journalArticlepeer-review

Abstract

Intensity modulated radiation therapy (IMRT) delivery involves a complex series of beam angles and multileaf collimator (MLC) arrangements, requiring quality assurance to be performed to validate delivery before treatment. The purpose of this work is to investigate the effect of dose gradient on quality assurance (QA) passing rate. Many (n = 40) IMRT plans were delivered and measured using a 2D planar array of ion chambers; additionally, eleven plans were measured at several coronal planes. For each measurement, dose gradient was assessed using a number of metrics and passing rate assessed at both 3%/3 mm and 3%/2 mm criteria. The passing rates of the various IMRT plans were shown to be generally correlated to gradient, with an average distance correlation of 0.54 ± 0.04 for the lateral dose gradient. The passing rate for an individual plan was shown to vary with coronal slice, though the correlation to dose gradient was not predictable. Even though the passing rate was strongly related to dose gradient for many of the plans, the signs of the correlations were not always negative, as hypothesized. The coronal plane at which QA is performed affects passing rate, though dose gradient may not easily be used to predict slices at which passing rate is higher.

Original languageEnglish
Article number102594
Pages (from-to)102594
JournalPhysica Medica
Volume110
DOIs
StatePublished - Jun 2023

Keywords

  • External beam radiotherapy
  • IMRT
  • Quality assurance
  • Radiotherapy Dosage
  • Benchmarking
  • Radiotherapy Planning, Computer-Assisted
  • Quality Assurance, Health Care
  • Radiotherapy, Intensity-Modulated

Fingerprint

Dive into the research topics of '2D IMRT QA passing rate dependency on coronal plane'. Together they form a unique fingerprint.

Cite this