Comparison of elekta vmat with helical tomotherapy and. Pdf on jun 1, 2010, auje taqaddas and others published physics behind vmat find, read and cite all the research you need on researchgate. Monaco treatment planning enhances departmental efficiencies the time savings and workflow efficiencies introduced with monaco version 5. Monaco is a comprehensive treatment planning solution for 3d, imrt, vmat and stereotactic techniques that uses the goldstandard monte. The royal college of radiologists, uk has published guidance stating that imc radiotherapy imcrt should be considered for women with higher risk breast. This work presents a flexible browser based reporting and visualization system for clinical and scientific use, not currently found in commercially. Three arc vmat for sphenoidal meningioma planned using. Some studies report changes in leaf width had no effect on vmat dosimetry, while others suggest an advantage with 4 mm over 1 cm leaves. Sensitivity of an elekta iview gt asi epid model to.
Volumetric modulated arc therapy vmat has the potential to shorten treatment times for fluence modulated radiotherapy. Considering the minimal invasiveness of stereotactic radiosurgery and the fewer sideeffects than with wbrt, stereotactic radiosurgery might be a suitable alternative for patients with up to ten brain metastases. Elekta vmat allows treatment times to be reduced significantly compared to conventional delivery and helical tomotherapy. A vmat planning solution for prostate patients using a.
This work presents a flexible browser based reporting and visualization system for clinical and scientific use, not currently found in. View the table of contents for this issue, or go to the journal homepage for more. American college of radiology acr and american society for. In the first 2hour session, all participants planned the first case. Feb 04, 20 the finnish house from double boards in 5 days diy. These characteristics promise to facilitate fast and accurate delivery of radiotherapy, particularly volumetric. Considering the minimal invasiveness of stereotactic radiosurgery and the fewer sideeffects than with wbrt, stereotactic radiosurgery might be a suitable alternative for patients with up to ten brain. Verification is being carried out using ion chambers in a range of phantoms for overall delivered dose to the isocentre and using the delta4 3d diode system and radiochromic film for dose distributions. Hippocampalsparing and target volume coverage in treating 3. In contrast, the vmat can decrease the treatment delivery time as vmat has more beam entry angles, which likely contributes to the lower number of mu needed compared with the imrt plan.
Comprehensive treatment delivery analysis that exceeds what is possible with hardwarebased solutions is done instantly and automatically, becoming a part of your patients treatment record. Although this data is available in one form or other within the centralised systems, it is often not in the form which is of interest to the departmental staff. Intraoperative radiation therapy iort periscopic viewer. To evaluate the impact of different machines on plan quality using both intensity modulated radiation therapy imrt and volumetricmodulated arc therapy vmat techniques. Find, read and cite all the research you need on researchgate. Parameters can be passed into your instance of image viewer to change attributes such as image captions, image positioning, and when images within the viewer are loaded. Code of practice for the quality assurance and control for. Comparison of elekta vmat with helical tomotherapy and fixed. A treatment planning study comparing elekta vmat and fixed.
Monte carlo techniques for patient specific verification. Optimization methods for volumetric modulated arc therapy and radiation therapy under uncertainty by fei peng a dissertation submitted in partial ful llment of the requirements for the degree of doctor of philosophy industrial and operations engineering in the university of michigan 20 doctoral committee. The purpose of this work is detecting possible differences between local qa findings and those of an audit, using the same set of treatment plans. The simulations involved the use of the beamnrc and dosxyznrc monte carlo codes to predict the response of the iviewgt asi epid model. Apr 19, 2019 inclusion of the internal mammary chain imc in the target volume for locoregional breast radiotherapy has been proven to improve disease free and overall survival in recently published clinical trials. Imrt treatment planning and delivery is a complex process. However, commercial treatment planning systems for conventional medical. Elekta xvi volumetric imaging and registration qa with the mimi phantom kurt stump, ph. In the netherlands, head and neck cancer hnc is the 8th most common cancer for men and the 9th most common cancer for women in 2018 with a total of approximately 3100 new cases annually 1.
Vmat optimization constraints maximum mlc displacement constraint for varian mlc at max speed the gantry rotates through a 360 deg arc in 60 s max leaf speed of mlc leaves is 3 cms by constraining vmat delivery to a maximum leaf displacement of 0. Our results suggest that stereotactic radiosurgery without wbrt in patients with five to ten brain metastases is noninferior to that in patients with two to four brain metastases. Please note you are currently viewing a development qa box. Treatment plan quality assurance qa for vmat was performed using the iba matrixx system while an ion chamber and films were used for ht. Evaluation of organ motionbased robust optimisation for vmat. Investigation of the change in marker geometry during. A vmat planning solution for prostate patients using a commercial treatment planning system to cite this article.
This work was motivated by an initial study including ten nonsmall cell lung cancer nsclc patients which evaluated the dosimetric consequences. Quality assurance is a vital part of any radiotherapy service. Optimization methods for volumetric modulated arc therapy. With elekta vmat, single or multiple radiation beams sweep in uninterrupted arcs around the patient, dramatically speeding treatment delivery. Imrt and vmat plans were generated for a 6 mv elekta synergy linear accelerator elekta oncology, uk equipped with a standard multileaf collimator with a leaf width of 1 cm at isocenter. Scaricamento dei manuali i manuali possono essere scaricati solo online.
Elekta vmat can be delivered using single or multiple arcs. For plan optimization, the maximum number of segments was set at 10 per beam, the minimum segment area was set at 8 cm 2, and the minimum segment mu per fraction. Vmat and ht plans were delivered using elekta s precisebeam vmat linac control system elekta ab, stockholm, sweden and a tomotherapy hi. The periscopic viewer is made of stainless steel and clear anodized aluminum parts. Evaluation of the elekta synergy concept for patient. Dualarc vmat was used in both cases, and a scoring system based on the fulfillment of clinical goals was created and communicated to the participants. When detectors become more efficient in detecting mv photons there are several possibilities fo. Compared to imrt, single and doublearc vmat plans showed. A comparison of several modulated radiotherapy techniques for. Mar 18, 2019 advanced stage nonsmall cell lung cancer asnsclc is generally treated with concurrent chemoradiotherapy using a radiation dose of 6066 gray gy in 3033 fractions over sixseven weeks 1. Local implementation of planspecific quality assurance qa methods for intensitymodulated radiotherapy imrt and volumetric modulated arc therapy vmat treatment plans may vary because of dissimilarities in procedures, equipment and software. Lee jw, park jh, chung jb, park jy, choe by, suh ts, et al. Jan 20, 2015 every day a large amount of data is produced within a radiotherapy department. Pdf vmat testing for an elekta accelerator researchgate.
The main objective of this thesis is to present a full monte carlo mcbased inverse treatment planning method for trajectorybased volumetric modulated arc therapy tvmat. Lapp nikon manual viewer 2 viene utilizzata per scaricare e visualizzare i manuali delle fotocamere slr nikon. Then, the movement of the phantom was verified by using xvi symmetrytm system. A comparison of several modulated radiotherapy techniques. Clinicians can use elekta vmat with complete or partial arcs to reduce treatment times from the 812 minutes required for conventional radiation therapy to as few as two minutes. It is easy and familiar to use, remaining independent of the treatment. There was a median of 6 metastases per plan, with an average total tumor volume of 7. View and download viewera v200t user manual online. The finnish house from double boards in 5 days diy. Eight patients with squamous cell carcinoma of the oropharynx were selected at random. The system can provide both 2d and 3d data for image guided radiotherapy igrt.
Evaluation of organ motionbased robust optimisation for. Three arc vmat for a sphenoidal meningioma planned using monaco with vmat patient history and diagnosis an 80 year old cuban woman presented in 2005 with an episode of disorientation while driving. As treatment technology and complexity have developed, so has the burden of qa in terms of both time and cost. Elekta oncentra and varianbrachyvision treatment planning systems annual applicator qa quarterly source exchange, daily qa and emergency drills treatment planning, plan verification, chart check, treatment, emergency response and documentation prostate ldr brachytherapy seed implants and assays. Intraoperative radiation therapy iort periscopic viewer system.
The use of a realistic vmat delivery emulator to optimize dynamic. Anatomical detection was performed on a digital imaging and communications in medicine dicom viewer with the free software imagej pixel size, 0. Intensitymodulated radiation therapy imrt and volumetric modulated arc therapy vmat are widely used treatment techniques 2. Vmat comprises a simultaneous variation of gantry position and speed, leaf and jaw positions, dose rate and possibly collimator angle. Research open access a treatment planning study comparing elekta vmat and fixed field imrt using the varian treatment planning system eclipse. The periscopic viewer is used with the periscopic electron cones item 1100ec1. Full responsibility of the clinical use of shared templates resides with. Just load your rt plan and deliver your beams as you would with standard hardwarebased pretreatment qa solutions. Dual arc volumetricmodulated arc radiotherapy vmat of nasopharyngeal carcinomas. Treatment options for hnc may consist of surgery, radiotherapy, chemotherapy or any combination of these modalities. With consistent templates, planning vmat imrt is much easier.
Two years alone in the wilderness escape the city to build off grid log cabin duration. Vmat and ht plans were delivered using elektas precisebeam vmat linac control system elekta ab, stockholm, sweden and a tomotherapy hi. The elekta synergy machine for external beam radiation therapy is equipped with an xray tube for online kv imaging and correction of the patient setup. A monte carlo inverse treatment planning algorithm for. Inclusion of the internal mammary chain imc in the target volume for locoregional breast radiotherapy has been proven to improve disease free and overall survival in recently published clinical trials. The predicted epid images were compared to the measured images obtained. A monte carlo model of an elekta iviewgt amorphous silicon electronic portal imaging device asi epid has been validated for pretreatment verification of clinical imrt treatment plans. After contouring the virtual target, 1 arc vmat plan was performed from monaco version 3. To improve anatomical detection, images were enlarged two times. Vmat testing for an elekta accelerator cyberleninka. Elekta synergy radiotherapy unit, which incorporates a kv imaging system orthogonal to the mv treatment axis. The main highlights of their study were the mlc positional tests including picket fence test. The royal college of radiologists, uk has published guidance stating that imc radiotherapy imcrt should be considered for women with higher risk breast cancer 4. Physical aspects of volumetric modulated arc therapy vmat using elekta synergy and.
During the initial setup the worklists are uploaded into the device via pc and are available for selection prior to each measurement. The main objective of this thesis is to develop monte carlo mc techniques for verification of complex radiation therapy treatments with emphasis on total body irradiation tbi and volumetric modulated arc therapy vmat. Intensity modulated radiation therapy versus volumetric. View and download viewera v191 series user manual online. At the time she had an mri and was diagnosed with a meningioma growing close to the optic chiasm. The purpose of this work is detecting possible differences between local qa findings and those of an audit, using the same. Inverse verification of the dose distribution for intensity modulated radiation therapy patientspecific quality assurance using dynamic mlc log files. The introduction covers briefly the transition from imrt to vmat and points out the. An extensive report by kaurin et al reported on tests for all parameters of vmat on elekta linac 48. Optimization methods for volumetric modulated arc therapy and.
Advanced stage nonsmall cell lung cancer asnsclc is generally treated with concurrent chemoradiotherapy using a radiation dose of 6066 gray gy in 3033 fractions over sixseven weeks 1. Apr 14, 2014 at the time of vmat planning, an elekta axesse beam model with 4 mm leaves was available. Vmat planning for elekta linear accelerators is supported with the following commercial. Evaluation of elekta symmetrytm 4d igrt system by using. Related content the use of a realistic vmat delivery emulator to optimize dynamic machine parameters c j boylan, c g rowbottom and.
Tps was used to produce vmat plans for multi target brain. In the vmat, one or multiple arcs are used for the treatment, and the delivery technique allows the simultaneous variation in gantry rotation speed, dose rate. We are uncertain of the implications arising from changes in leaf width in our cohort. Vmat, formally known as intensity modulated arc therapy. Aug 22, 20 in contrast, the vmat can decrease the treatment delivery time as vmat has more beam entry angles, which likely contributes to the lower number of mu needed compared with the imrt plan. Sensitivity of an elekta iview gt asi epid model to delivery. American college of radiology acr and american society.
The agility multileaf collimator elekta ab, stockholm, sweden has 160 leaves of projected width 0. The speed of vmat delivery allows you to offer the excellent conformity and dose distribution to a larger proportion of your patients, without compromising the efficiency of the clinic. Automatic in vivo portal dosimetry of all treatments, phys med biol, 58 20 no. Application of volumetric modulated arc therapy vmat in a dual. Research open access a treatment planning study comparing elekta vmat and fixed field imrt using the varian treatment planning system eclipse samuel peters, hans schiefer and ludwig plasswilm. Plans were computed for imrt and vmat smart arc, using pinnacle tps for an elekta imrte. Every day a large amount of data is produced within a radiotherapy department. Elekta xvi volumetric imaging and registration qa with the. Comparison of dose metrics between automated and manual. The median hippocampal dmax in gy without sparing averaged 1. Per our clinical practice, each plan was generated using 6 or 7 6mv beams with angles within 45 o of the nearest tangent beam, using an elekta synergy linac elekta, crawley, uk.
Vmat was implemented on a synergys linear accelerator elekta ltd. T epid is the most common method but as technology advance new methods arise. Dual arc volumetricmodulated arc radiotherapy vmat of. Beam modeling and vmat performance with the agility 160. Auditing local methods for quality assurance in radiotherapy. Protocolised way to cope with anatomical changes in head.
Elekta assurance new levels of automation and integration for advanced qa. With a suite of advanced guidance tools, imaging of soft tissue at the time of treatment allows efficient verification of tumor and critical structure position, providing. An evaluation of the monaco treatment planning system for. Initially, the existing elekta vmat system, which uses. Tvmat uses continuous and simultaneous gantry and couch rotation to reduce the radiation exposure of normal tissues. All authors read and approved the final manuscript.
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