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 “"3D Dose"”.
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Direct optimization of 3D dose distributions using collimator rotation
… plan without compromising the quality of the dose distribution. It is also shown that an arrangement of equispaced collimator angles takes full advantage of the flexibility associated with collimator rotation. A study including ten recurring nasopharynx cancer patients is used to evaluate the …
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Evaluation of Presage® As A 3D Dose Verification to ol In Proton Beams
… techniques have advanced and radiation dose plans have become much more complex over the last decade. This is especially true in proton therapy, which involves extremely steep dose gradients as a result of positioning the Bragg peak to cover the volumes to be treated. The Bragg peak can …
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Evaluation of Presage® Dosimeters For Brachytherapy Sources and The 3D Dosimetry and Characterization of The New Agx100 125I Seed Model
… source designs and techniques, method of 3D dosimetry for treatment dose verifications would better ensure accurate patient radiotherapy treatment. This study was aimed to first evaluate the 3D dose distributions of the low-dose rate (LDR) Amersham 6711 Oncoseed<sup>TM</sup> using …
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Treatment Planning Automation For Rectal Cancer Radiotherapy
… two common existing treatment techniques, 3DCRT and VMAT, for rectal cancers, and then explored an alternative method for creating a treatment plan using deep learning. </p> <h2>Methods:</h2> <p>To automate the 3DCRT treatment technique, we used deep learning to predict the shapes of field …
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Cone Beam Optical Computed Tomography-Based Gel Dosimetry
The complex dose distributions delivered by modern, conformal radiation therapy techniques present a considerable challenge in dose verification. Traditional measurement tools are difficult and laborious to use, since complete verification requires that the doses be determined in three dimensions …
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Polymer Gel Dosimetry in Magnetic Resonance-Image Guided Radiation Therapy
… treatment plan and consequently a better dose delivery to the tumor. The need for MR-IGRT treatment plan verification with 3D dosimeters arose due to the presence of the strong magnetic field altering dose depositions in 3D. Furthermore, vendors only provide MR-compatible electronics that …
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Volumetric Scintillation Dosimetry For Scanned Proton Beams
… Scanned proton beams can produce complex 3D dose distributions, presenting a challenge for adequate quality assurance testing. Because each scanned beam dose measurement requires the delivery of the entire field, multiple measurements can be time consuming. These quality assurance …
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Volumetric, Magnetic Resonance-Visible, and Radiation-Sensitive Detectors For Magnetic Resonance Image-Guided Radiation Therapy
… the magnetic field cause perturbations of the dose distribution in three dimensions. Current vendor-supplied electronic quality assurance tools can provide at best quasi-3D sampling of the dose distribution and cannot be MR imaged. As a result, there was a growing need for volumetric, …
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The Development of Artificial Intelligence-Based to ols For Expert Peer Review of Radiotherapy Treatment Plans
… is selected because it meets basic organ at risk dose thresholds for severe toxicity; however, it is evident that a plan with a decreased risk of normal tissue complication probability could be achieved. This discrepancy between “acceptable” and “best possible” plan is magnified if either the …
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Evaluation of yttrium-90 positron emission tomography dosimetry
… near liver tumors. Radioembolization dose planning and dosimetry are based on crude, inaccurate assumptions due to the lack of knowledge of patient specific <sup>90</sup>Y microsphere distribution. In recent years, the very small 3.1867e-5 internal pair production decay branch of …