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 193 for “"dosimetry"”.
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Neutron dosimetry with a water calorimeter
… being evaluated. It is important that the dosimetry of neutron beams is consistent so that clinical results from different centres can be compared. Due to the relatively large uncertainties in the measurement of absorbed dose in neutron beams this consistency is difficult to achieve. This …
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Understanding The Influence of Photon Energy On 6Mv Non Reference Dosimetry and Ct Dosimetry Using Tld and Osld
… include detailed calibration procedures for CT dosimetry using OSLD, and a full characterization of this dosimetry system in a low-dose, low-energy setting.</p>
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Volumetric Scintillation Dosimetry For Scanned Proton Beams
… scintillation detector. Volumetric scintillation dosimetry is a new technique with the potential to provide fast, high-resolution measurements of scanned proton beams. Initial studies using scintillation dosimetry for IMPT quality assurance have shown promise, despite quenching effects caused by …
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In-Vivo Ct Dosimetry During Virtual Colonoscopy
<p>Virtual colonoscopy (VC) is a minimally invasive means for identifying colorectal polyps and colorectal lesions by insufflating a patient’s bowel, applying contrast agent via rectal catheter, and performing multi-detector computed tomography (MDCT) scans. The technique is recommended for colonic …
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Monte Carlo simulations for heavy ion dosimetry
… ( ) calculations for the ionization chamber dosimetry of clinically relevant ion beams with initial energies from 50 to 450 MeV/u have been performed using the Monte Carlo technique. To simulate the transport of a particle in water the computer code SHIELD-HIT v2 was used which is a …
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Cone Beam Optical Computed Tomography-Based Gel Dosimetry
… accuracy of ± 5% for the dose delivery. Gel dosimetry is an attractive option for realizing a tissue-equivalent, 3D dose verification tool with high resolution readout capabilities. However, much important work remains to be completed prior to its acceptance in the clinic. The careful …
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Towards low dose retrospective dosimetry on shelled species
… tissues of shelled species for retrospective dosimetry using electron paramagnetic resonance (EPR) spectroscopy. To determine applicable samples for low dose studies, shells of crustacean and mollusc species were irradiated to 10 Gy using a 137Cs source. Reference dosimetry was performed with …
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Evaluation of yttrium-90 positron emission tomography dosimetry
… 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 <sup>90</sup>Y has been …
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Fluence-based Dosimetry using Fluorescent Nuclear Track Detectors
… relevant fluences. Thus, their fluence-based dosimetry performance has been investigated within this thesis. Fluence assessment in multidirectional fields was realized by ion track reconstruction through the detector volume. The angular distribution could be measured accurately within 2° …
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Radiation Dosimetry in the Presence of Gold Nanoparticles
… towards quantifying the dose enhancement and the dosimetry surrounding GNPs. This thesis investigates the dosimetry in the presence of GNPs for several scenarios using PENELOPE Monte Carlo simulations. Accurate simulation of GNPs can be challenging due to the large number of particles present in …
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Low Dose Dosimetry and Radiation Response in Rodent Models
Exposure to ionizing radiation from diagnostic imaging procedures has dramatically increased in the last three decades. Computed tomography is a powerful and invaluable diagnostic imaging tool, but it is essential that the radiation risks be appropriately quantified so that clinicians are in the …
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Ion dosimetry for radiobiology experiments employing laser-accelerated beams
… to investigate this behaviour, accurate dosimetry is key to an in-depth understanding of the cell reaction to dose deposited via various particle types and energies. <br/><br/>A commonly used dosimeter in ionization experiments is radiochromic film (RCF), as it provides an optical density …
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Biological dosimetry of neutron beams for neutron capture therapies
… the first combined biological and physical dosimetry interbeam comparison data of three neutron beams used in boron neutron capture therapies: the Massachusetts Institute of Technology (MIT) and Brookhaven National Laboratory epithermal neutron beam facilities previously used in Phase I/II …
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Carbon Nanotube Based Dosimetry of Neutron and Gamma Radiation
… the risk of catastrophic failure. The current dosimetry approaches used in these high flux environments do not provide real-time information. Instead, radiation dose is calculated using computer simulations, which are checked against dose readings that are only available during refueling once …
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Bias and Variability In Image-Based Volumetric Yttrium-90 Dosimetry
… remain to be the weakest link in volumetric dosimetry. The objectives of this dissertation project were to improve image-based volumetric 90Y dose quantification using current commercially available systems and to determine its limitation (bias/variability).</p> <p>We have developed a …
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Encapsulated Contrast Agent Markers For Mri-Based Post-Implant Dosimetry
… the Sirius MRI markers for prostate post-implant dosimetry.</p> <p>First, I compared the dose-volume histogram and other dosimetry parameters generated by MIM Symphony (a brachytherapy treatment planning system that allow the use of MRI images for treatment planning; MIM Software Inc., Cleveland, …
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