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 10 of 10 for “"clinical target volume"”.
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Development of A Beam-Specific Planning Target Volume and A Robust Plan Analysis to ol For Proton Therapy
… accounted for by geometrically expanding a clinical target volume (CTV) to a planning target volume (PTV). However, a PTV alone cannot adequately account for range uncertainties coupled to misaligned patient anatomy in the beam path since it does not account for the change in tissue density. …
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Evaluation of target motion and determination optional treatment margins for prostate cancer treated with external beam radiotherapy on Halcyon
… Using published margin recipes, the minimum clinical target volume (CTV)-planning target volume (PTV) expansion margin was calculated. Patients and Methods Prostate motion was evaluated by comparing prostate position on the planning CT to cone-beam CT (CBCT) scans. Prostate position error in …
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Analysis of 3D and 4D proton treatment planning for hepatic tumors
… treatment planning includes 1) propagating the target contours, drawn by a physician on one phase, to all breathing phases using deformable registration, 2) calculating the compensating bolus for proton therapy, and then 3) calculating 4D dose distributions. Dose volume histograms are used to …
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Feasibility of Using Stereotactic Body Radiation as an Alternative to HDR for Treatment of Cervical Cancers
… Brachytherapy is frequently used to boost volumes at risk in the treatment of cervical cancers. Not all centers have HDR, or LDR capabilities, however, all have at least a linear accelerator. The possibility of using external beam radiation therapy utilizing a Stereotactic Body Radiation …
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Auto-Delineation of Oropharyngeal Clinical Target Volumes Using Deep Learning Techniques
… radiation dose to the defined treatment targets achieving more accurate target dose distribution and better sparing of normal tissues. However, producing very precise treatment plans may be ineffective if the target volumes are not defined accurately. Furthermore, there are several …
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Improvements In Robustness and Optimality of Intensity-Modulated Proton Therapy Plans For Lung Cancer Patients With 4-Dimensional Robust Optimization
… optimizes dose distributions to achieve target dose coverage and normal tissue sparing for multiple setup and range uncertainty scenarios and for all 10 respiratory phases simultaneously. IMPT dose distributions of ten lung cancer patients with differing tumor sizes and motion magnitudes …
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Implementation,Validation and Application of an Automated Motion Correction Algorithm in Hepatic Perfusion CT for Image-Guided Radiotherapy
… (DCE-CT) image series, which consisted of 40 CT volumes acquired sequentially over 2 minutes. Perfusion maps were generated from unregistered and registered DCE-CT scans and compared to determine impact of motion correction on tumour-normal tissue contrast. The motion corrected perfusion maps …
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Automated Radiotherapy Treatment Planning for Breast Cancer: A Robust to ol for Global Deployment
… reviewed by physicians to determine clinical acceptability. Five automated conventional planning approaches were developed, complemented by an established RapidPlan model for volumetric arc therapy. These included conventional tangents for whole-breast treatment, variations for …
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Evaluation and Clinical Implementation of a Dual-Energy CT Stopping-Power Ratio Mapping Technique for Proton-Therapy Treatment Planning
… range is correctly aligned to the edge of the clinical target volume (CTV). However, its clinical potential is dependent on the accurate localization of the Bragg-peak position from predicted stopping-power ratio maps. The method that is most commonly used in today’s clinical practice for …
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Imaging Techniques for Proton Range Determination in Proton Therapy
… vector model (JSIR-BVM) was integrated with a clinical Monte Carlo-based treatment planning system (TPS) for dose prediction comparison with the standard stoichiometric SECT method. Percentage deviation from the ground-truth volume receiving 80% of the prescription dose within a 5 mm …