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Comparison of IMRT and VMAT plans with different energy levels
Investigation of pulsed IMRT and VMAT for re-irradiation
Volumetric Modulated Arc Therapy: Planning and Evaluation for
Clinical implementation and evaluation of the Acuros dose
Use automated investigations to investigate and remediate threats
Physics and Treatment Planning Considerations for Multifocal
Sci-Thur PM: YIS - 03: Comparing 4D-VMAT, Gated-VMAT and 3D
Purpose: To investigate and evaluate fast two-point step-size
TPS Commissioning and QA Oncology Medical Physics
Investigation of VMAT Algorithms and Dosimetry - CORE
Critical appraisal of the accuracy of Acuros-XB and
Dosimetric comparison of tomotherapy and volumetric‐modulated
Complexity metrics for IMRT and VMAT plans: a review of
Investigation of a Novel Decision Support Metric for Head and
Improving radiotherapy planning, delivery accuracy, and
Dosimetric comparison between IMRT and VMAT in irradiation
Evaluation of the Impact of the Linac MLC and Gantry Sag in VMAT
Intensity-modulated radiotherapy and volumetric-modulated arc
Beam complexity and monitor unit efficiency comparison in two
Investigation of vmat algorithms and dosimetry - kindle edition by auj-e-taqaddas. Download it once and read it on your kindle device, pc, phones or tablets. Use features like bookmarks, note taking and highlighting while reading investigation of vmat algorithms and dosimetry.
This is a 62-year-old white male that was diagnosed with prostate cancer in late 2010.
The vmat algorithm is integrated into the current mskcc treatment planning system for future clinical usage. A pop-up dialog window allows configuration of optimization setup parameters such as initial beam apertures, initial number of beams in the optimization, weight difference constraint δw and the number of iterations at each resolution.
Irregular patient breathing patterns (high velocities) require further investigation and development of the simulation algorithms. Conclusions: dose accumulation algorithms allow for assessment of motion effects but still remain challenging. Our results show that interplay effects influence imrt and vmat dose distribution.
Request pdf investigation of vmat algorithms and dosimetry abstract: purpose: planning and dosimetry of different vmat algorithms (smartarc, ergo++, autobeam) is compared with imrt for head.
The npc vmat plans in this study used two full arcs with gantry angles of 181°–179° for a cw rotation and 179°–181° for a ccw rotation, and the collimator angles were set to 15° and 345° to avoid possible overlapping tongue and groove effects.
Compared with aaa, acuros xb improves accuracy in the presence of inhomogeneity, and also significantly reduces computation time for vmat plans. Dose differences between aaa and acuros_dsubw,m/sub were generally less than the dose differences between aaa and acuros_dsubm,m/sub.
Purpose a single-isocenter volumetric modulated arc therapy (vmat) treatment to multiple brain metastatic patients is an efficient stereotactic radiosurgery (srs) option. However, the current clinical practice of single-isocenter srs does not account for patient setup uncertainty, which degrades treatment delivery accuracy. This study quantifies the loss of target coverage and potential.
Planning and dosimetry of different vmat algorithms (smartarc, ergo++, autobeam) is compared with imrt for head and neck cancer patients. Modeling was performed to rule out the causes of discrepancies between planned and delivered dose.
Investigation of a novel algorithm for true 4d‐vmat planning with comparison to tracked, gated and static delivery erika chin physics and astronomy, university of british columbia, vancouver, british columbia v6t 1z1, canada and medical physics, bc cancer agency‐vancouver centre, vancouver, british columbia v5z 4e6, canada.
Recent theoretical studies and clinical investigations have indicated that volumetric modulated arc therapy (vmat) can produce equal or better treatment plans than intensity modulated radiation therapy (imrt), while achieving a significant reduction in treatment time.
Throughout the vmat arc, the beam is modulated based on an inverse optimization algorithm in order to spare organs at risk. Single isocenter multi-target vmat has already been implemented for intracranial srs and is increasingly used for extracranial sbrt treatments.
Purpose: volumetric modulated arc therapy (vmat) is an intensity modulated radiation therapy technique which can achieve highly conformal dose delivery through dynamic variation of dose rate, gantry speed, and multileaf collimator positions. Due to the complexity of treatment delivery, patient specific quality assurance (qa) is required to ensure agreement between calculated and delivered dose.
We apply bandit methodology to explore the layout space efficiently and use hill- climbing to select optimal content in realtime.
Compared to conformational radiotherapy (crt), intensity modulated radiotherapy (imrt) and volumetric modulated arc therapy (vmat) improve target volume conformity and normal tissue sparing, resulting in reduced acute and late toxicities. 1–4 considering conventional linear-accelerators (linacs), intensity modulation is achieved through different parameters, according to the technique used.
Acute and late toxicities were scored according to the radiation therapy and oncology group/european organization for research and treatment of cancer.
A novel 4d volumetric modulated arc therapy (4d vmat) planning system is presented where radiation sparing of organs at risk (oars) is enhanced by exploiting relative target and healthy tissue motion induced by patient respiration. In conventional radiation therapy, a motion encompassing margin is normally added to the clinical target volume (ctv) to ensure the tumour receives the planned.
Dose calculation algorithms should model precisely the chemical composition of materials to avoid discrepancies between calculation and actual delivery in patients [13]. In parallel to the new photon techniques, more and more clinically available, challenging indications are also ideal fi elds of investigation for protons [14,15].
Investigation of a novel algorithm for true 4d-vmat planning with comparison to tracked, gated and static delivery. Author information: (1)physics and astronomy, university of british columbia, vancouver, british columbia v6t 1z1, canada.
Single arc version of the same, called vmat, proposed by otto has evolved because of its simplicity and delivery efficiency compared to the method proposed by yu et al12. Along with these developments, commercial availability of vmat such as varian’s rapidarc and elekta’s vmat products developed considerable momentum in clinical applications.
Point dose measurements are a well established patient specific qa technique for vmat. The aim of this study was to investigate the relationship between plan complexity and the agreement between measured and calculated point doses. The suitability of five different detectors for vmat point dose measurements was also evaluated.
Investigation of the compounding effect of mlc positioning uncertainty and gantry angular acceleration in vmat delivery.
Convolution algorithms are collapsed cone convolution (ccc) (philips radiation oncology systems, fitchburg, wi ) and anisotropic analytical algorithm (aaa) (varian medical systems, palo alto, ca, usa). Recently, varian has introduced a new algorithm, acuros xb, which solves the linear boltzmann transport equa-tion (lbte).
Volumetric modulated arc therapy (vmat) is, in the variety of radiation treatment modalities, a possibly valuable but also challenging technique because of its intrinsic complexity involving advanced inverse planning algorithms, dose calculation engines applied to complex fields and dynamic delivery with several variable parameters (speed of multileaf collimator, dose rate, gantry rotational.
Mar 25, 2016 aim of this study is to investigate the efficacy of dose distribution in eleven prostate cancer patients with single vmat and double vmat when.
May 30, 2018 in this study, a novel approach is proposed to provide a high-efficient optimization algorithm for vmat treatment planning.
Dec 12, 2014 the ct and structures are obtained from the publicly available research set [29].
At that time, an efficient planning method for imatwas not available, yet much research has since been devoted to developing optimization algorithms for imat. 4 in 2008, otto designed an optimization algorithm to deliver imat in a single-arc manner, which he called volumetric-modulated arc therapy (vmat).
Investigation should focus on highly modulated imrt/vmat plans as these will be most impacted by subtle errors in mlc model parameters. There is significant disagreement in the the required testing for an imrt/vmat program. Mppg5 tests recommend only the minimum and more testing may be appropriate in a given clinical setting.
Evaluation of the aaa algorithm determined that it is acceptable for clinical use in rapidarc vmat treatment planning. In this investigation, we provide a solution to oces in rapidarc imrt optimization and planning for superficial tumors.
Comparison of two advanced techniques: vmat in its rapidarc form, and intensity modulated proton therapy (by means of spot scanning). The second objective was the investigation of the impact, on dose distributions of rapidarc treatments, of two dose calculation algorithms differently accounting for chemical composition of materials.
The aim of this study was to assess the impact of fractional dose and the number of arcs on interplay effects when volumetric modulated arc therapy (vmat) is used to treat lung tumors with large respiratory motions. 5 gy) by two (number of arcs, one or two) vmat plan was created for 10 lung cancer cases.
Imrt/vmat inverse-planned fixed-gantry imrt / modulated arc • list optimization objectives for target coverage and nt sparing as usual • place high weight on target coverage objectives • do not include uniform dose objectives for target; no upper limit or high upper limit (60-90% isodose line) • create rings to create steep dose gradients.
Feb 2, 2021 the technology in automated investigation uses various inspection algorithms and is based on processes that are used by security analysts.
The purpose of this study is therefore to evaluate the impact of gantry and mlc carriage sag on vmat clinical performance. Methods: a published dataset of elekta and varian sag measurements served as a starting point for the investigation. Typical sag profiles were chosen and modeled as continuous isocenter deviations in three dimensions.
With such algorithms, the line search step can be avoided or highly reduced, and significant speedup can be obtained. As a specified form of nonlinear convex models, the quadratic models are particularly investigated and the best form of the gradient method without line search is found.
Jun 11, 2020 for a thorax phantom and a lung patient, three fiducial markers were inserted around the tumor and vmat plans were created with two partial.
In the case of ptv encompassing the mediastinum in central lung cancer, table iv illustrated the dosage comparison between vmat and imrt plans. 2pa-vmat exhibited superior hi and ci compared with imrt, sa- and pa-vmat in most cases, but v40 (%) of heart in 2pa-vmat was higher compared with imrt, sa- and pa-vmat.
Conventional imrt in head-and- neck cancer: a comparative planning and dosimetric study.
As part of the diagnosis, the medical team generates three-dimensional diagnostic images (usually ct and/or pet) of the patient's anatomy and then uses these.
Nevertheless, comparisons of vmat and 3dcrt have revealed no early clinical or radiographic changes in the lung post-treatment also, as with conventional imrt, vmat-based plans are subject to the interplay effect, which must be considered depending on the mobility of the tumor and the degree of modulation of the mlc fields.
Feb 8, 2014 aim of the present study was to make dosimetric comparisons of vmat and 7- field imrt with dynamic mlcs using the monte carlo algorithm.
Investigation of vmat algorithms and dosimetry pdf posted on february 23, 2019 by admin purpose: planning and dosimetry of different vmat algorithms (smartarc, ergo++ autobeam) is compared with imrt for head and neck.
Investigation of outcomes of glioblastoma patients treated with volumetric arc therapy (vmat) and intensity modulated radiation therapy (imrt) md anderson study status enrolling.
Xerostomia is a devastating late effect of head and neck cancer (hnc) radiation therapy. 1 because of the proximity of the salivary glands to the tumor site, they may overlap with the planning target volume (ptv) that receives prescription dose; thus, radiation exposure to the glands is often unavoidable.
Modulated techniques (imrt/vmat) are increasingly being utilized for lung sbrt. Therefore algorithm study and the other 20 were used for the type-b algo-.
Fff beams for vmat lung sabr has been shown to signi cantly reduce treatment delivery time, while maintaining plan quality and accuracy. Another potential advan-tage of the use of fff beams for vmat lung sabr is the reduction in peripheral (out-of- eld) dose, due mainly to the reduction in head scatter and treatment head leakage.
However, unlike imrt, the gantry of the accelerator may rotate along one or more arcs and deliver radiation continuously.
The need to modify the original ct image of the delta4 phantom for accurate dose calculation and comparison is addressed in this work, applying a ct extension algorithm. A number of test plans varying from simple 4—field conformal to imrt and vmat plans were measured to evaluate the accuracy of this device.
Dec 20, 2017 as a result, rotational imrt, a delivery technique known as volumetric modulated arc therapy (vmat), was developed.
May 9, 2011 our 4d‐vmat algorithm aims to reduce oar dose by incorporating 4d volumetric target and oar motions directly into the optimization.
Aug 17, 2011 due to the necessary synchronization of both dose rate and gantry motion with mlc movement, it is clear that vmat involves new and different.
Purpose: planning and dosimetry of different vmat algorithms (smartarc, ergo++, autobeam) is compared with imrt for head and neck cancer patients. Modelling was performed to rule out the causes of discrepancies between planned and delivered dose.
One of the recent advances in radiation oncology and treatment planning is volumetric modulated arc therapy (vmat).
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