From phase-based to displacement-based gating: a software tool to facilitate respiration-gated radiation treatment.

Journal of Applied Clinical Medical Physics
Joseph P SantoroGig S Mageras

Abstract

The Varian Real-time Position Management (RPM) system allows respiratory gating based on either the phase or displacement (amplitude) of the breathing waveform. A problem in clinical application is that phase-based gating, required for respiration-correlated (4D-CT) simulation, is not robust to irregular breathing patterns during treatment, and a widely used system version (1.6) does not provide an easy means to change from a phase-based gate into an equivalent displacement-based one. We report on the development and evaluation of a robust method to convert phase-gate thresholds, set by the physician, into equivalent displacement-gate thresholds to facilitate its clinical application to treatment. The software tool analyzes the respiration trace recorded during the 4D-CT simulation, and determines a relationship between displacement and phase through a functional fit. The displacement gate thresholds are determined from an average of two values of this function, corresponding to the start and end thresholds of the original phase gate. The software tool was evaluated in two ways: first, whether in-gate residual target motion and predicted treatment beam duty cycle are equivalent between displacement gating and phase gating durin...Continue Reading

References

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Oct 7, 2004·International Journal of Radiation Oncology, Biology, Physics·Gig S MagerasC Clifton Ling
Nov 3, 2004·International Journal of Radiation Oncology, Biology, Physics·René W M UnderbergSuresh Senan
May 18, 2005·Medical Physics·Eike RietzelGeorge T Y Chen
Jun 9, 2005·Journal of Applied Clinical Medical Physics·Ellen YorkeGikas S Mageras
Jun 9, 2007·Medical Physics·Y D MutafD H Brinkmann
Apr 4, 2008·Medical Physics·Dan RuanJames M Balter

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Citations

Nov 10, 2015·Reports of Practical Oncology and Radiotherapy : Journal of Greatpoland Cancer Center in Poznań and Polish Society of Radiation Oncology·Carla Hajj, Karyn A Goodman
Mar 13, 2014·International Journal of Radiation Oncology, Biology, Physics·David ThomasDaniel Low
Apr 29, 2015·Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology·Carla Hajj, Karyn A Goodman
Sep 17, 2013·Journal of Applied Clinical Medical Physics·Yang-Kyun ParkSung-Joon Ye
May 4, 2013·Physics in Medicine and Biology·Daniel A LowJames M Lamb
Nov 5, 2016·Physics in Medicine and Biology·D H ThomasD A Low
Dec 14, 2017·Physics in Medicine and Biology·Sebastian SauppeMarc Kachelrieß
Feb 25, 2021·Nuclear Medicine Communications·Jung-Soo KimHyung-Jin Yang

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Software Mentioned

Varian
RPM
Advantage
MATLAB

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