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 8 of 8 for “"4D dose"”.
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Motion Estimation and Motion-Compensated Reconstruction for Four-Dimensional Cone Beam Computed Tomography (4D-CBCT)
… radiation therapy (SBRT) characterizing as high dose in each fraction and few fraction number requires higher accuracy for tumor localization. For organs influenced by the respiration, respiration induced motion becomes the principal cause for tumor localization uncertainty and four dimensional …
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4D Monte Carlo Based Patient Dose Reconstruction Incorporating Surface Motion Measurements
… assess the impact of respiratory motion on the dose delivered during radiotherapy using a previously validated 4D Monte Carlo-based dose reconstruction tool, 4Ddefdosxyznrc. As a surrogate for tumour motion, abdominal surface motion measurements were recorded during patient treatments using the …
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Analysis of 3D and 4D proton treatment planning for hepatic tumors
… this study is to assess the difference between 4D liver dose calculations versus standard 3D treatment planning and to investigate the dosimetric gain of gating on radiation dose to normal tissue. 4DCT scans are collected for 25 patients with hepatic tumors treated by proton radiotherapy. The 4D …
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Improvements In Robustness and Optimality of Intensity-Modulated Proton Therapy Plans For Lung Cancer Patients With 4-Dimensional Robust Optimization
… a novel four-dimensional robust optimization (4DRO) method and find an appropriate optimization strategy to make IMPT dose distributions less sensitive to both respiratory motion as well as to setup and range uncertainties simultaneously.</p> <p>For full 4DRO, the effect of respiratory motion, …
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Investigation of Respiratory Motion Management Techniques For Proton and Photon Radiotherapy of Lung Cancer
… can provide a substantial improvement over dose distributions that can be achieved with conventional sources of radiation such as high-energy photons. However, respiratory motion can significantly impact the delivered proton and photon dose distributions during lung cancer radiotherapy. The …
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Optimization of Image Guided Radiation Therapy for Lung Cancer Using Limited-angle Projections
… acquisition enables scan time and imaging dose reduction and improves the mechanical clearance of imaging.</p><p>First of all, the dissertation developed a phase-matched digital tomosynthesis (DTS) technique using limited-angle (<=30 deg) projections for lung tumor localization. This …