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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Intensity-modulated radiotherapy and volumetric-modulated arc therapy for malignant pleural mesothelioma after extrapleural pleuropneumonectomy.
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For the single-arc technique, 6 plans met the clinical objectives, 8 plans vmta modifications. Varian Medical systems, Inc. The main difference between the two techniques, and therefore an advantage for VMAT, lies in the reduction in delivery time.
Based on the available IMRT optimizing templates, new VMAT optimizing templates for each treatment region and prescribed dose were created in total 10 different templates: Mean DVHs of 18 prostate cancer cases with two hip implants. Single and double arc plans before 1A, 2A and after modification 1Am, 2Am of the optimization penalties; values are elkta as the mean range.
VMAT in treatment of spinal metastases. Wlekta, the maximum spine dose was clearly lower for all VMAT techniques up to The length of the arcs was adjusted separately for each case one implant: Leaf position error during conformal dynamic arc and intensity modulated arc treatments.
Supplementary Material Additional file 1: Table 1 Planning objectives for organs at risk and target volumes. The purpose of this study was to evaluate this algorithm for different disease sites by creating single- and double-arc VMAT plans. Plans with two arcs show better dose distributions than plans with one arc. CN ranges from 0 to 1, where 1 is the ideal value. Therefore, the quality of the optimizer can be analyzed.
Depending elfkta the tumor region, 5 to 9 coplanar fields were chosen, eelkta with our clinical standard section II.
Elekta VMAT Radiation Therapy Rapidly Gaining Users Worldwide As Technique Evolves
However, conformity was significantly better for single- and double-arc plans CN: Volumetric modulated arc radiotherapy for carcinomas of the oro-pharynx, hypo-pharynx and larynx: For the single-arc technique, 8 plans met the objectives, 9 after modification. The maximum target dose and the conformity were better for double-arc plans than for IMRT; for single-arc plans, the corresponding values were below the mean values of IMRT.
In three spine cases, radiation dose was reduced versus IMRT. For the single-arc technique 1Asix plans were acceptable after adapting 1Am nine.
IMRT; thin dashed line: Similarly, the OAR sparing was better for double-arc plans. Breast cases An acceptable plan was achieved for the double-arc technique in 9 out of 10 vmta cancer cases; an acceptable plan was achieved in 5 cases for the single-arc technique.
Elekt treatment planning study comparing volumetric arc modulation with RapidArc and fixed field IMRT for cervix uteri radiotherapy. These findings demonstrate that based on optimizing templates with minimal interaction of the operator, the Eclipse TPS is able to achieve a plan quality for vmst Elekta VMAT delivery technique that is comparable to that of fixed-field IMRT.
Example of an endometrial plan showing the differences in target coverage and conformity. Gallen, Switzerland Find articles by Samuel Peters.
The differences between single- and double-arc plans were small: The OARs met the clinical objectives in all cases for all techniques. Testing of the analytical anisotropic algorithm for photon dose calculation. Its rich, intuitive tools make the radiotherapy planning process faster, easier and clinically reliable.
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.
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Elekta VMAT – Peninsula Cancer Center
Example of a prostate plan with two hip implants. J Appl Clin Med Phys. From five different tumor regions — head and neck, brain, cervical and endometrial, breast and prostate — fixed-field step-and-shoot IMRT plans that were used for patient treatment between January and June on an Elekta Synergy Linac were examined.
The differences between single- and double-arc plans were small; significant differences in favor of 2A were noted for the maximum dose in the PTV Clinical implementation of intensity-modulated arc therapy IMAT for rectal cancer. As the number of MUs per treatment is correlated with the amount of scatter dose and leakage radiation, which could be important based on the induction of secondary malignancies [ 3233 ], a decrease in the number of MUs achieved with VMAT is desirable.
Plans with brain tumors showed similar behavior: After modifying the optimization penalties, no improvements could be identified for either the target volume or the OAR. The number of monitor units was statistically significant lower for VMAT by factors of 1. With Elekta VMAT, single or multiple radiation beams sweep in uninterrupted arc s around the patient, dramatically speeding treatment delivery. However, the differences were often small and detectable even when statistically significant with no clinical relevance, e.
It also is beneficial for patients whose pain makes prolonged treatment sessions undesirable. VMAT plans were generated using a preclinical version of Eclipse with tumor-region-specific optimizing templates without interference of the operator: