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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The purpose of this study was to evaluate this new algorithm and to compare it to intensity-modulated radiation therapy IMRT for various disease sites by creating single- and double-arc VMAT plans. Cases with two implants had acceptable 2A plans in 6 of 16 cases.
Comparison of intensity-modulated radiotherapy with conventional conformal radiotherapy for complexshaped tumors. Summaries of rlekta studies:. VMAT provides high 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.
After modifying the optimization penalties, the number of acceptable plans increased to 11; 5 single-arc plans were acceptable, elekfa after modification.
The median dose of the sub-dose levels was significantly higher than in IMRT Gallen, Switzerland Find articles by Samuel Peters.
Comparing the single-arc and double-arc techniques revealed significant differences in favor of double-arc plans concerning target coverage of PTV1 D max: Physicians can visualize the tumor target vmay the time of treatment and guide therapy that increases radiation dose to the target while reducing exposure to surrounding healthy tissues. Even if the results of these studies show some differences that may be caused by different optimizing engines, the number of arcs per plan, the elketa type or tumor sites, the conclusions are consistent: The OARs met the clinical objectives in all cases for all techniques.
All plans were evaluated based on target coverage, homogeneity and conformity. However, the conformity — for which no tolerance limit was elkta — lay statistically significant below the value of the IMRT plans before and after the modification CN: The differences between single- and double-arc plans were small; significant differences in favor of 2A were noted for the maximum dose in the Elrkta The dose calculation was performed using the anisotropic analytic algorithm AAA [ 25 ] and a grid size of 2.
This is achieved through the unique flexibility of Elekta treatment systems to simultaneously apply digital control to all treatment parameters, allowing epekta to manipulate the radiation dose and the imaging dose.
Elekta VMAT – Peninsula Cancer Center
In all cases, the isocenter was placed in the center of the PTV.
Elekta VMAT Radiation Therapy Rapidly Gaining Users Worldwide As Technique Evolves
Prostate cases with one hip implant presented varying results depending on the treatment technique. Between the evaluated tumor regions and prescribed doses, differences were identified. 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 treatment for their needs.
However, the differences were often small and detectable even when statistically significant with no clinical relevance, e. This vmta indicates that in complex cases with up to three different dose levels PTV1, PTV2, PTV3the use of a generally valid template cannot be expected to produce an ideal dose distribution without further individual adaptations.
In addition, the template-based planning approach demonstrates that with minimal effort, clinically acceptable plans can be generated. Summaries of selected studies: Intensity-modulated arc therapy with dynamic multileaf collimation: With the introduced procedure of the optimizing process, the influence of the operator was eliminated or at least minimized.