Fundamental properties of the delivery of volumetric modulated arc therapy (VMAT) to static patient anatomy

Rangaraj, D; Oddiraju, Swetha; Sun, Baozhou; Santanam, Lakshmi; Yang, Deshan; Goddu, S; Papież, Lech

doi:10.1118/1.3453575

Cited by 18 publications

(17 citation statements)

References 17 publications

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“…The following linac specific parameters for VMAT delivery have to be fed into the planning system as described similar for Eclipse™ and RapidArc® [23]:…”

Section: Methodsmentioning

confidence: 99%

Searching standard parameters for volumetric modulated arc therapy (VMAT) of prostate cancer

et al. 2012

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BackgroundSince December 2009 a new VMAT planning system tool is available in Oncentra® MasterPlan v3.3 (Nucletron B.V.). The purpose of this study was to work out standard parameters for the optimization of prostate cancer.MethodsFor ten patients with localized prostate cancer plans for simultaneous integrated boost were optimized, varying systematically the number of arcs, collimator angle, the maximum delivery time, and the gantry spacing. Homogeneity in clinical target volume, minimum dose in planning target volume, median dose in the organs at risk, maximum dose in the posterior part of the rectum, and number of monitor units were evaluated using student’s test for statistical analysis. Measurements were performed with a 2D-array, taking the delivery time, and compared to the calculation by the gamma method.ResultsPlans with collimator 45° were superior to plans with collimator 0°. Single arc resulted in higher minimum dose in the planning target volume, but also higher dose values to the organs at risk, requiring less monitor units per fraction dose than dual arc. Single arc needs a higher value (per arc) for the maximum delivery time parameter than dual arc, but as only one arc is needed, the measured delivery time was shorter and stayed below 2.5 min versus 3 to 5 min. Balancing plan quality, dosimetric results and calculation time, a gantry spacing of 4° led to optimal results.ConclusionA set of parameters has been found which can be used as standard for volumetric modulated arc therapy planning of prostate cancer.

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“…The following linac specific parameters for VMAT delivery have to be fed into the planning system as described similar for Eclipse™ and RapidArc® [23]:…”

Section: Methodsmentioning

confidence: 99%

Searching standard parameters for volumetric modulated arc therapy (VMAT) of prostate cancer

et al. 2012

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“…And these parameters are liable to change in transition between control points accordingly to fulfill the required number of MUs. 11,22,23 The VMAT QA plan was designed based on the principle of VMAT delivery. There were 24 control points with different combinations of gantry speed and dose rate as shown in positions of MLC leaves are introduced concretely in Subsection 2.B.…”

Section: A the Design Of Vmat Qa Planmentioning

confidence: 99%

A novel method for routine quality assurance of volumetric‐modulated arc therapy

Wang

Dai

2013

Medical Physics

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“…The MLC essentially allows the beam (or matrix of beamlets) to be shaped to the contour of the tumor by blocking parts of the beam with the leaves. Volumetric modulated arc therapy (VMAT) [18,20] involves continuous motion of the beam around the patient to track the tumor, has been developed in order to minimize beam on-time and reduce danger to the patient. In this paper we present a novel method for algorithmically computing the point or points in time that a tumor is most exposed, for the purpose of supporting IMRT (with multi-leaf collimator) treatments.…”

Section: Introductionmentioning

confidence: 99%

Radiation therapy simulation and optimization using kinetic polygon modeling

Allen

Daescu

2013

2013 IEEE 14th International Conference on Information Reuse &Amp; Integration (IRI)

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Intensity modulated radiotherapy (IMRT) is a treatment for various cancers that involves applying a beam of radiation to diseased tumor cells.Although effective at destroying cancerous tissue, physicians must take care to avoid healthy tissues during the treatment plan as these may also be damaged. To improve treatment, computational methods are often employed to allow treatment planners to track the target tumor and apply radiation when it is less obstructed by healthy organs and tissues and thus more exposed to the beam, maximizing the damage to the diseased cells while minimizing the harm to healthy cells. Internal organs and tissues are rarely static, so this optimal time frame can be challenging to pinpoint. In this paper we develop a novel algorithm and accompanying data structure to determine the point in time at which the tumor target is most exposed. By modeling the organs and tumor as a set of moving polygons in the beam's eye view and using a kinetic data structure to track the level of exposure of the tumor as organs in the treatment area move, healthy tissue can be protected and the tumor can be targeted with greater effectiveness and precision, thus improving the overall quality of treatment.

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Fundamental properties of the delivery of volumetric modulated arc therapy (VMAT) to static patient anatomy

Abstract: The investigations derive and prove time optimal VMAT deliveries. The relationships between delivery parameters are determined. The optimal alternative delivery strategies are discussed.

Cited by 18 publications

References 17 publications

Searching standard parameters for volumetric modulated arc therapy (VMAT) of prostate cancer

Searching standard parameters for volumetric modulated arc therapy (VMAT) of prostate cancer

A novel method for routine quality assurance of volumetric‐modulated arc therapy

Radiation therapy simulation and optimization using kinetic polygon modeling

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