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 dosimetry"”.
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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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Measurement of The Electron Return Effect Using Presage Dosimeter
… of dose enhancement over a three-dimensional (3D) volume around tissue interfaces inside the patient body, giving rise to the need for 3D dosimetry. If proven reliable in the magnetic field, 3D dosimetry will provide a more rigorous means for the quality assurance (QA) of MRgRT than …
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An optical computed tomography scanner for three dimensional gel dosimetry of radiotherapy dose distributions
… calculate patient specific three dimensional (3D) radiation dose distributions. Treatment planning system (TPS) calculated doses are evaluated by clinicians to ensure suitable dose coverage of targeted tumours and the avoidance of excessive doses to normal tissues. The accuracy of the TPS must …
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Characterization of The New Xoft Axxent Electronic Brachytherapy Source Using Presage(Tm)
… electronic brachytherapy, an accurate method of 3D dosimetry is needed to ensure understanding of dose distributions, which can improve patient care. The aim of this study was to characterize the Xoft Axxent electronic brachytherapy source using PRESAGE<sup>TM</sup> dosimeters in order to obtain …
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Polymer Gel Dosimetry in Magnetic Resonance-Image Guided Radiation Therapy
… 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 measure dose distributions at best in quasi-3D. The implementation of 3D dosimetry …
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Evaluation of Presage® As A 3D Dose Verification to ol In Proton Beams
… shortcoming has led to an interest in a robust 3D dosimeter with dosimetric accuracy matching that of traditional devices. PRESAGE®, a novel radiochromic dosimeter, has shown promise in dose verification of complex IMRT treatments. As such, there have been numerous studies of PRESAGE® as a 3D …
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Volumetric, Magnetic Resonance-Visible, and Radiation-Sensitive Detectors For Magnetic Resonance Image-Guided Radiation Therapy
… 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, MR-visible, and radiation-sensitive detectors for MR-IGRT applications. To fill this need for volumetric dose quality assurance, this …
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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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Quality Assurance of Advanced Treatment Modalities Using Presage® Dosimeters
… is able to provide a complete 3D measured dosimetry dataset with one treatment plan delivery. It was hypothesized that a PRESAGE<sup>® </sup>dosimeter would agree with 2D measurements within ±5%/3mm using a gamma index analysis. The PRESAGE<sup>®</sup> dosimeter will detect dose …
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3D Scintillator Detector Quenching Characterization For Scanning Proton Beams
… setups and time consuming measurements. Fast 3D measurements are therefore desirable to verify the complex dose distribution and to enable the utilization of the full potential of proton therapy. The overall objective of this project is to improve volumetric scintillators detectors to provide …