Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"treatment planning system"”.
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Integration of VMC++ into a Commercial Treatment Planning System
… interest to integrate VMC++ into the commercial treatment planning system at VCU as another Monte Carlo code option, since it has been shown to increase efficiency dramatically without introducing a significant amount of systematic error. Also, independent validation of VMC++ for photon beams is …
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Development and application of a multi-modality inverse treatment planning system
… therapy (IMRT) opened new possibilities for the treatment planning process. Most of the existing treatment planning (TP) tools for the IMRT are focusing on the use of photons for the treatment. To achieve a very high computional speed only simplified dose calculation algorithms are used. …
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Identifying Treatment Planning System Errors In Iroc-Houston Head and Neck Phantom Irradiations
<p>Treatment Planning System (TPS) errors can affect large numbers of cancer patients receiving radiation therapy. Using an independent recalculation system, the Imaging and Radiation Oncology Core-Houston (IROC-H) can identify institutions that have not sufficiently modelled their linear …
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Characterization of Treatment Planning System Photon Beam Modeling Errors In Iroc Houston Phantom Irradiations
… radiation therapy, proper commissioning of the treatment planning system’s (TPS) dose calculation algorithm is critical because any errors in this process impact all treatment plans prepared in the system. Previously, TPS errors have been identified as a major cause for poor phantom irradiation …
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Comprehensive Calculation-Based Imrt Qa Using R&V Data, Treatment Records, and A Second Treatment Planning System
… transfer through the Record-and-Verify (R&V) system, and various aspects of the physical delivery.<strong> </strong></p> <p><strong>Methods: </strong>We recomputed the treatment plans in the patient geometry for 48 cases using data from the R&V, and from the delivery unit to calculate the …
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The application of parallel processing to radiotherapy dose computation
… undergoing high-energy x-ray radiotherapy treatment for cancer requires accurate simulation of photon beams. Current algorithms using equivalent depth or tissue-air ratio (TAR) correction techniques fail to accurately model electron transport, and hence show inaccuracy in inhomogeneous …
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Encapsulated Contrast Agent Markers For Mri-Based Post-Implant Dosimetry
… generated by MIM Symphony (a brachytherapy treatment planning system that allow the use of MRI images for treatment planning; MIM Software Inc., Cleveland, OH) and VariSeed (a widely used brachytherapy treatment planning system; Varian Medical Systems, Inc., Palo Alto, CA), and found the …
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4D Monte Carlo Based Patient Dose Reconstruction Incorporating Surface Motion Measurements
… motion measurements were recorded during patient treatments using the RADPOS system. Motion traces, treatment log files and deformation vectors representing each patient's respiratory motion were used as inputs to the 4D dose reconstructions. Motion measurements were performed for 3 patients …
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Degradation of proton and carbon Bragg peaks due to density inhomogeneities
Current analytical treatment planning of radiotherapy with protons and heavier ions neglect degradation of the sharp distal dose falloff (Bragg peak, BP) caused by inhomogeneous tissue. There is no appropriate model of this effect - which in turn allowed reduction of related dose deposition …
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Automating Intensity Modulated Radiation Therapy Treatment Planning by using Hierarchical Optimization
… to the complexity of the optimization, the IMRT treatment planning is still a trial and error process. Hierarchical optimization was proposed to automate the treatment planning process, but its potential has not been demonstrated in a clinical setting. Moreover, hierarchical optimization is …
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Risk of Second Malignant Neoplasms Following Proton Arc Therapy and Volumetric Modulated Arc Therapy For Prostate Cancer
… </strong>Physician-approved treatment plans were created for both modalities for three patients. Therapeutic dose was obtained with differential dose-volume histograms from the treatment planning system, and stray dose was estimated from the literature or calculated with Monte …
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Improving Treatment of Local Liver Ablation Therapy With Deep Learning and Biomechanical Modeling
… of metastasis is the standard of care for treatment with curative intent, it is only avai lable to about 20% of patients. For patients who are not surgical candidates, local percutaneous ablation therapy (PTA) has been shown to have a similar 5-year overall survival rate. However, PTA can …
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Influence on different Monte-Carlo variances at the dose calculation and the impact to the commissioning
… Dose calculations were made with a Monaco® Treatment Planning System which runs a Monte Carlo dose computation algorithm. Calculation times were investigated as functions of field sizes and chosen calculation uncertainty. Film measurements were made for each calculated dose distribution and …
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Treatment planning for manifold multi-ion particle therapy
Conventional charged particle radiation therapy systems utilise a single charged particle species to deliver a therapeutic radiation dose to the target - most commonly protons or carbon ions. While such radiation therapy is highly effective for the treatment of many cancers, there is growing …
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Absolute Dose Verification in Intensity Modulated Radiation Fields
… using a Varian Clinac 21000 Varian Medical Systems Inc., Palo Alto, CA. The dosimetric property of Kodak XV film was verified for 6 and 18 MV photon beams. A technique to quantify film over response to low photon energy was presented. Monte Carlo calculations were used to validate …
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Assessment of Collimator Jaw Optimization In Reducing Normal Tissue Irradiation With Intensity Modulated Radiation Therapy
… <p><strong>Methods: </strong>Clinical radiation treatment plans for 10 thoracic, 3 pediatric and 3 head and neck patients were converted to plans with the jaws tracking each segment’s MLC apertures. Each segment was then renormalized to account for the change in collimator scatter to obtain …
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Evaluation of The Effectiveness of Anisotropic Analytical Algorithm In Flattened and Flattening-Filter-Free Beams For High Energy Lung Dose Delivery Using The Radiological Physics Center Lung Phantom
… Algorithm (AAA) implemented in the Eclipse treatment planning system (TPS) was evaluated using theRadiologicalPhysicsCenteranthropomorphic lung phantom using both flattened and flattening-filter-free high energy beams. Radiation treatment plans were developed following the Radiation Therapy …
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Equipment to Address Infrastructure and Human Resource Challenges For Radiotherapy In Low-Resource Settings
… radiotherapy chair (to facilitate low-cost treatment devices) and a fully automated treatment planning strategy.</p> <p>A fixed-beam patient treatment device would allow for reduced upfront and ongoing cost of teletherapy machines. The enabling technology for such a device is the …
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Evaluation and Clinical Implementation of a Dual-Energy CT Stopping-Power Ratio Mapping Technique for Proton-Therapy Treatment Planning
… SPR mapping technique in proton radiotherapy treatment planning. In the second part of this dissertation, the integration of JSIR-BVM into analytical and Monte Carlo based proton dose calculations was assessed. A preliminary analysis was first performed in a simulated and clinical scenario to …
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Modeling Proton Relative Biological Effectiveness Using Monte Carlo Simulations of Microdosimetry
… goal of this work is to implement MKM into a treatment planning system to assess the theoretical clinical impact of including variable RBE during treatment plan optimization.</p> <p>This work presents a method to calculate ��<sub>��</sub> and model the RBE of several proton RBE experiments. …
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