DMLC motion tracking of moving targets for intensity modulated arc therapy treatment: a feasibility study

Acta Oncologica
Jens ZimmermanPaul J Keall

Abstract

Intensity modulated arc therapy offers great advantages with the capability of delivering a fast and highly conformal treatment. However, moving targets represent a major challenge. By monitoring a moving target it is possible to make the beam follow the motion, shaped by a Dynamic MLC (DMLC). The aim of this work was to evaluate the dose delivered to moving targets using the RapidArc (Varian Medical Systems, Inc.) technology with and without a DMLC tracking algorithm. A Varian Clinac iX was equipped with a preclinical RapidArc and a 3D DMLC tracking application. A motion platform was placed on the couch, with the detectors on top: a PTW seven29 and a Scandidos Delta4. One lung plan and one prostate plan were delivered. Motion was monitored using a Real-time Position Management (RPM) system. Reference measurements were performed for both plans with both detectors at state (0) "static, no tracking". Comparing measurements were made at state (1) "motion, no tracking" and state (2) "motion, tracking". Gamma analysis showed a significant improvement from measurements of state (1) to measurements of state (2) compared to the state (0) measurements: Lung plan; from 87 to 97% pass. Prostate plan; from 81 to 88% pass. Sub-beam informat...Continue Reading

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Citations

Oct 5, 2013·Medical Physics·Eric W PepinHiroki Shirato
Mar 16, 2013·Physics in Medicine and Biology·Tobias PommerPer Munck af Rosenschöld
Jul 17, 2012·Zeitschrift für medizinische Physik·Mihaela Rosu, Geoffrey D Hugo
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Nov 3, 2009·International Journal of Radiation Oncology, Biology, Physics·Mario BignardiMarta Scorsetti
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Mar 10, 2012·International Journal of Radiation Oncology, Biology, Physics·Per Rugaard PoulsenPaul Keall
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Jun 20, 2013·Physics in Medicine and Biology·G A DaviesG Poludniowski
Dec 2, 2020·Medical Physics·Paul J KeallSotirios Stathakis

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