Dosimetric validation of Monaco treatment planning system on an Elekta VersaHD linear accelerator

Ganesh Narayanasamy, Daniel L. Saenz, Dewayne Defoor, Nikos Papanikolaou, Sotirios Stathakis

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The purpose of this study is to perform dosimetric validation of Monaco treatment planning system version 5.1. The Elekta VersaHD linear accelerator with high dose rate flattening filter-free photon modes and electron energies was used in this study. The dosimetric output of the new Agility head combined with the FFF photon modes warranted this investigation into the dosimetric accuracy prior to clinical usage. A model of the VersaHD linac was created in Monaco TPS by Elekta using commissioned beam data including percent depth dose curves, beam profiles, and output factors. A variety of 3D conformal fields were created in Monaco TPS on a combined Plastic water/Styrofoam phantom and validated against measurements with a calibrated ion chamber. Some of the parameters varied including source to surface distance, field size, wedges, gantry angle, and depth for all photon and electron energies. In addition, a series of step and shoot IMRT, VMAT test plans, and patient plans on various anatomical sites were verified against measurements on a Delta4 diode array. The agreement in point dose measurements was within 2% for all photon and electron energies in the homogeneous phantom and within 3% for photon energies in the heterogeneous phantom. The mean ± SD gamma passing rates of IMRT test fields yielded 93.8 ± 4.7% based on 2% dose difference and 2 mm distance-to-agreement criteria. Eight previously treated IMRT patient plans were replanned in Monaco TPS and five measurements on each yielded an average gamma passing rate of 95% with 6.7% confidence limit based on 3%, 3 mm gamma criteria. This investigation on dosimetric validation ensures accuracy of modeling VersaHD linac in Monaco TPS thereby improving patient safety.

Original languageEnglish (US)
JournalJournal of Applied Clinical Medical Physics
DOIs
StateAccepted/In press - 2017

Fingerprint

Monaco
Particle Accelerators
Linear accelerators
linear accelerators
Photons
planning
Planning
photons
dosage
Electrons
electron energy
Therapeutics
gantry cranes
confidence limits
Ionization chambers
energy
output
field tests
flattening
ionization chambers

Keywords

  • Dosimetric validation
  • Monaco
  • Monte Carlo
  • Treatment planning system
  • VersaHD

ASJC Scopus subject areas

  • Radiation
  • Instrumentation
  • Radiology Nuclear Medicine and imaging

Cite this

Dosimetric validation of Monaco treatment planning system on an Elekta VersaHD linear accelerator. / Narayanasamy, Ganesh; Saenz, Daniel L.; Defoor, Dewayne; Papanikolaou, Nikos; Stathakis, Sotirios.

In: Journal of Applied Clinical Medical Physics, 2017.

Research output: Contribution to journalArticle

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