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 9 of 9 for “"point dose"”.
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Assessing and Modulating Tumor Dose Coverage of Unsealed Radionuclide Therapies using Voxel Dosimetry
<p>This work interrogates absorbed dose metrics for spherical tumors under various configurations with emerging theragnostic radionuclides to understand the true dose being delivered to key points in and around the tumor and how real imaging systems effect the accuracy of these doses. Dose volume …
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Implementation of Upright Treatments For Lung and Head and Neck Cancers
… results to those in the original plans. The dose coverage and normal tissue doses were less optimal in the upright H&N plans. However, with proper planning techniques, similar quality as the original plans is likely achievable. For the end-to-end test, the treatment plan passed the IMRT QA …
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CONE BEAM COMPUTED TOMOGRAPHY (CBCT) DOSIMETRY: MEASUREMENTS AND MONTE CARLO SIMULATIONS
… protocol for CBCT. Computed tomography dose index (CTDI), a standardized metric in conventional CT dosimetry, or direct organ dose measurements have been limitedly used in the CBCT dosimetry.</p> <p>This dissertation investigated the CBCT dosimetry from the CTDI method to the organ, …
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Development and Implementation of An Anthropomorphic Pediatric Spine Phantom For The Assessment of Craniospinal Irradiation Procedures In Proton Therapy
… as a cancer treatment modality, as it allows for dose deposition to the target volume while sparing the surrounding healthy tissue. This technique is advantageous for craniospinal pediatric patients, as it reduces the radiation side effects that can occur. The purpose of this study is to design an …
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Commissioning An Anthropomorphic Spine and Lung Phantom For Remote Dose Verification of Institutions Participating In Rtog 0631
… spinal canal, esophagus, heart, and lungs. The dose to the target volume was measured with axial and sagittal planes of radiochromic film and thermoluminescent dosimeters (TLD). The dose distributions were measured with the radiochromic film calibrated to the absolute dose measured by the TLD. …
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Development and Implementation of A Homogeneous and A Heterogeneous Anthropomorphic End to End Quality Assurance Audit System Phantom For Magnetic Resonance Guided Radiotherapy Modalities Ranging From 0.35 T to 1.50 T
… film and TLDs by comparing beam profiles and point dose measurements irradiated with and without magnetic fields, respectively. GEANT4 Monte Carlo simulations validated the detectors in both Unity 0T/1.5T and MRIdian 0T/0.35T configurations. Two MRgRT anthropomorphic (H&N and thorax) phantoms …
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Improving Cervical Cancer Nodal Boost Radiation Therapy By Quantifying Uncertainties and Exploring Advanced Radiation Therapy Modalities
… be performed considering previously delivered dose. This project aims to address the major issues of this complex process for the purpose of improving treatment accuracy while increasing dose sparing to the surrounding normal tissues.</p> <p>Because external beam boosts to involved lymph nodes …
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Consistency of Advanced Radiation Therapy QA Methods and Global Auditing Systems
… exhibited a substantial impact on the dose calculation accuracy for both phantom and clinical cases, across all clinical anatomical sites, up to ±5.7% and +16.7 to the CTV and OAR respectively. It was found that these dose perturbations were related to plan complexity. The mean MLC Gap …
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In-Vivo Ct Dosimetry During Virtual Colonoscopy
… radiation exposure. To date, no in‐vivo organ dose measurements have been performed for MDCT scans; thus, the accuracy of any current dose estimates is currently unknown.</p> <p>In this study, two TLDs were affixed to the inner lumen of standard rectal catheters used in VC, and in-vivo rectal …