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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Materials and Methods Patient plan selection and planning objectives 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.
Single and double arc plans before 1A, 2A and after modification 1Am, 2Am of the optimization penalties; values are expressed as the mean range. Treatment delivery systems With a comprehensive choice of delivery systems, Elekta is the ideal partner for ensuring that each clinic and patient receives the best system and vma for their needs. Example of an endometrial plan showing the differences in target coverage and conformity.
A comparison of single- and double-arc techniques revealed significant differences in favor of double-arc plans concerning target coverage D max: This is achieved through the unique flexibility of Elekta treatment systems to simultaneously apply digital control to all treatment parameters, allowing doctors to manipulate the radiation dose and the imaging dose.
SP is lead author, who designed the study and performed treatment planning, collected and analyzed data, interpreted data, revised literature and drafted the manuscript. Gallen, Switzerland Find articles by Ludwig Plasswilm.
Associated Data Supplementary Materials Additional file 1 List of the 10 used optimization templates. The mean total body dose was statistically significant lower for the considered arc techniques IMRT: Vergleich zweier Planverifikationsmethoden bei Rotationsbestrahlungen.
Prostate cases A total of 45 prostate cases were analyzed, of which 11 involved pelvic lymph nodes, 16 involved one hip implant and 18 involved two hip implants. Dosimetric effects of multileaf collimator leaf width on intensity-modulated radiotherapy for head and neck cancer. Volumetric modulated arc therapy: Significant differences in IMRT for single- and double-arc plans were noted for total body dose D max: The study was performed based on ethical board approval Ethics Committee St.
MLCs with smaller widths may improve the plan quality for such cases [ 28 – 30 ]. IMRT is superior to 3D conformal in target coverage, but had treatment times averaging 10 minutes.
Conclusion 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 the Elekta VMAT delivery technique that is comparable to that of fixed-field IMRT.
After modifying the optimization penalties, no improvements could be identified for either the target volume or the OAR.
Elekta VMAT – Peninsula Cancer Center
With Elekta VMAT, single or multiple radiation beams sweep in uninterrupted arc s around the patient, reducing treatment times from the eight to 12 minutes required for standard radiation therapy to as few as two minutes.
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.
Volumetric modulated arc therapy for delivery of prostate radiotherapy: However, the differences were often small and detectable even when statistically significant with no clinical relevance, e. The differences between single- and double-arc plans were small: IMRT plan comparisons for prostate cancer. With the use of templates, acceptable plans are easy to generate and minimal operator experience or interaction is required.
Depending on the tumor region, 5 to 9 coplanar fields were chosen, consistent with our clinical standard section II. VMAT in treatment of spinal metastases. Mean DVHs of 39 head and neck cancer cases with prescriptions of However, the maximum doses of the lenses and the optical nerves were lower for VMAT lenses: For the single-arc technique, 8 plans met the objectives, 9 after modification. Implementing IMRT in clinical practice: Even when statistical significance was noted, the differences could be very small e.
D max of the PTV 1A: Cases with target doses of Plans with two arcs show better dose distributions than plans with one arc.
The organs at risk OARs were analyzed according to plan objectives, such as the mean and maximum doses. Effects of flattening filter-free and volumetric-modulated arc therapy delivery on treatment efficiency.
Elekta VMAT Radiation Therapy Rapidly Gaining Users Worldwide As Technique Evolves
IMRT in a single gantry arc. VMAT plans were generated using a preclinical version of Eclipse with tumor-region-specific optimizing templates without interference of the operator: IMRT also improves plan eoekta the fixed vmag angles can be placed systematically to avoid irradiation through certain regions with such small structures. For most non-acceptable plans, the following values were out of tolerance: Summaries of selected studies:.
In three spine cases, radiation dose was reduced versus IMRT.
Of the 12 brain cancer cases, five 2A plans were acceptable for both OAR sparing and target coverage; after adapting the optimization penalties, 6 plans vmxt all objectives. Conclusions 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.
Comparing the single-arc and double-arc techniques revealed significant differences in favor of double-arc plans concerning target coverage of PTV1 D max: Single-arc plans had smaller improvements in comparison to IMRT, with significant differences only for D max VMAT provides elemta dose conformance to the target, while reducing risk to critical structures VMAT optimizes target dose delivery for all different patients and pathologies VMAT can reduce treatment time which can also decrease the likelihood of patient movement VMAT increases patient throughput due to faster delivery times, resulting in reduced waiting lists.
Leaf position error during conformal dynamic arc and intensity modulated arc elekat. All authors read and approved the final manuscript.
Comparing single- and double-arc plans, all parameters except MUs exhibited differences in favor of the double-arc technique, and differences in the parameters for PTV coverage, maximum dose in the bladder and vvmat were statistically significant. The newest release of the Eclipse TPS v.