VMAT planning for Elekta linear accelerators is supported with the following commercial and clinical routine treatment planning systems. Med Phys. Mar;37(3) Comparison of Elekta VMAT with helical tomotherapy and fixed field IMRT: plan quality, delivery efficiency and accuracy. VMAT, formally known as Intensity Modulated Arc Therapy. (IMAT), was first brought up by Dr. . Elekta VMAT can be delivered using single or multiple arcs.
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To exclude this qualitative and difficult-to-measure effect, a template based method that allows plans to be generated with almost no user interaction will be introduced. It also is beneficial for patients whose pain makes prolonged treatment sessions undesirable.
MLCs with smaller widths may improve the plan quality for such cases [ 28 – 30 ]. These patient plans included the following:.
Elekta VMAT Radiation Therapy Rapidly Gaining Users Worldwide As Technique Evolves
However, the differences were often small and detectable even when statistically significant with no clinical relevance, e. Furthermore, plans with two arcs provide better dose distributions than plans with one arc.
Summaries of selected studies: The purpose of this study was to evaluate this algorithm for different disease sites by creating single- and double-arc VMAT plans.
Plans with brain tumors showed similar behavior: The median dose of the sub-dose levels was significantly higher than in Vmar Coplanar versus noncoplanar intensity-modulated radiation therapy IMRT and volumetric-modulated arc therapy VMAT treatment planning for fronto-temporal high-grade glioma. The results of this study have demonstrated that the quality achieved using the Varian Eclipse treatment planning system with single- and double-arc VMAT plans for Elekta linear accelerators is comparable to that of fixed-field step-and-shoot IMRT for a variety of tumor sites.
Table 1 Planning objectives for organs at risk and target volumes.
Elekta VMAT – Peninsula Cancer Center
Published online Jul Brain cases Of the 12 brain cancer cases, five 2A plans were acceptable for both OAR sparing and target coverage; after vat the optimization penalties, 6 plans met all objectives. Clinical implementation of intensity-modulated arc therapy. Cases with two implants had acceptable 2A plans in 6 of 16 cases. VMAT in treatment of spinal metastases. Development and evaluation of an efficient approach to volumetric arc therapy vmwt.
Supplementary Material Additional file 1: Significant differences in IMRT for single- and double-arc plans were noted for total body dose D max: If one or more objectives were exceeded, the plan was considered clinically unacceptable, and elketa second VMAT plan was created by adapting the optimization penalties once. Even when statistical significance was noted, the differences could be very small e. During the optimizing process, the objectives or weights were not adjusted to exclude the influence of the operator, which allows an objective and independent evaluation of the dose distribution of all tumor regions.
Volumetric modulated eldkta therapy for delivery of prostate radiotherapy: Due to the low number of cases 6 left, 4 rightno statistical significance vmzt the differences can be given. Before 1A, 2A and after modification 1Am, 2Am of the optimization penalties divided by tumor site: Author information Article notes Copyright and License information Disclaimer.
Entering its third year of commercial availability, Vmqt VMAT has garnered more than orders, with many customers using the arc-based technique clinically since These techniques have given clinicians the flexibility to deliver conventional therapies to treat a wide range of tumors throughout the body, while also enabling treatment of highly complex cancers that require extreme targeting precision. IMRT also improves plan quality; the fixed gantry angles can be placed systematically to avoid irradiation through certain regions with such small structures.