Browsing Theses and Dissertations by Department "Medical Physics"
Now showing items 1-20 of 264
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A Collimator Setting Optimization Algorithm for Dual-arc Volumetric Modulated Arc Therapy in Pancreas Stereotactic Body Radiation Therapy
(2019)Purpose: To develop an automatic collimator setting optimization algorithm to improve dosimetric quality of pancreas Volumetric Modulated Arc Therapy (VMAT) plans for Stereotactic Body Radiation Therapy (SBRT). Methods: ... -
A Deep Learning Model for V50%, V60%, and V66.7% Prediction in LINAC-based Treatment Planning of Single-Iso-Multiple-Targets (SIMT) Stereotactic Radiosurgery (SRS)
(2023)Brain metastases are a common complication of many types of cancer, including lung, breast, and melanoma. Approximately 30-40% of patients develop brain metastases that originate from primary systemic tumors during the course ... -
A Dose Monitoring Program for Computed Radiography
(2012)Recently, there has been a lot of effort placed on monitoring patient dose from medical procedures. The majority of people's concern has been focused on computed tomography because of the higher amounts of patient dose associated ... -
A Dosimetric Characterization of Novel Formulations of Presage 3D Dosimeters
(2014)<bold>Purpose:</bold> The purpose of this work is to characterize three novel formulations of a radiochromic material Presage and identify optimal imaging procedures for accurate 3D dosimetry. The dosimetric qualities of ... -
A General-Purpose Simulator for Evaluating Astronaut Radiation Exposure
(2021)Purpose: Current Monte Carlo simulations modeling space radiation exposure typically use simplistic human phantoms with low anatomical detail and minimal variability in physical characteristics. This thesis describes the ... -
A Novel Approach for Effective Dose Measurements in Dual-Energy
(2014)<bold>Purpose:</bold>Our goal was to test a novel concept approximating organ dose measurements using the single mean energy of the two sources in dual-energy (DE) CT environment. Therefore, the purpose of this study was ... -
A Novel Comprehensive Verification Method for Multifocal RapidArc Radiosurgery Treatments
(2012)<bold>Purpose:</bold> Radiosurgery has become a widely used procedure in the treatment of both solid tumors and secondary metastases in the brain. In cases with multiple brain lesions, isocenters are typically set up for ... -
A Pattern Fusion Algorithm to Determine the Effectiveness of Predictions of Respiratory Surrogate Motion Multiple-Steps Ahead of Real Time
(2015)Purpose: Ensuring that tumor motion is within the radiation field for high-dose and high-precision radiosurgery in areas greatly influenced by respiratory motion. Therefore tracking the target or gating the radiation beam ... -
A Strategy for Matching Noise Magnitude and Texture Across CT Scanners of Different Makes and Models
(2012)<bold>Purpose: </bold> The fleet of x-ray computed tomography systems used by large medical institutions is often comprised of scanners from various manufacturers. An inhomogeneous fleet of scanners could lead to inconsistent ... -
ABSOLUTE QUANTIFICATION IN SMALL PLANT RADIOTRACER STUDIES
(2017)The main objective of this dissertation research is to develop measurement and data-analysis tools for improving the quantitative accuracy of radiotracer studies of small plants, e.g., grasses in their early growth stages ... -
Accelerated Multi-Criterial Optimization in Radiation Therapy using Voxel-Wise Dose Prediction
(2020)In external beam radiation therapy (EBRT) for cancer patients, it is highly desirable to completely eradicate the cancerous cells for the purpose of improving the patient’s quality of life and increasing the patient’s likelihood ... -
Accelerating Brain DTI and GYN MRI Studies Using Neural Network
(2021)There always exists a demand to accelerate the time-consuming MRI acquisition process. Many methods have been proposed to achieve this goal, including deep learning method which appears to be a robust tool compared ... -
Accuracy of Effective Dose Estimation Using Single and Double Badges and an Evaluation of Organ Dose and Image Quality in Thoracic MDCT Scans Through a Comparison of Bismuth Shields and a Global Reduction in Tube Current
(2012)<bold>Purpose:<bold> (1) To benchmark the accuracy of effective dose equivalent (EDE) of the single- and double-badge methods (NRC 2002-06) using the commercially available radiation monitors in clinical settings, (2) to ... -
Accuracy of Planar Dosimetry for Volumetric Modulated Arc Therapy Quality Assurance
(2011)With the advent of new, more efficient, rotational therapy techniques such as volumetric modulated arc therapy (VMAT), radiation therapy treatment precision requires evolving quality assurance. Two dimensional (2D) detector ... -
Adaptive Filtering for Breast Computed Tomography: An Improvement on Current Segmentation Methods for Creating Virtual Breast Phantoms
(2015)Computerized breast phantoms have been popular for low-cost alternatives to collecting clinical data by combing them with highly realistic simulation tools. Image segmentation of three-dimensional breast computed tomography ... -
Adaptive stereotactic body radiation therapy planning for lung cancer.
(Int J Radiat Oncol Biol Phys, 2013-09-01)PURPOSE: To investigate the dosimetric effects of adaptive planning on lung stereotactic body radiation therapy (SBRT). METHODS AND MATERIALS: Forty of 66 consecutive lung SBRT patients were selected for a retrospective ... -
Advanced Applications of 3D Dosimetry and 3D Printing in Radiation Therapy
(2016)As complex radiotherapy techniques become more readily-practiced, comprehensive 3D dosimetry is a growing necessity for advanced quality assurance. However, clinical implementation has been impeded by a wide variety of ... -
Advanced Deep Learning Methods for Brain Metastasis Post-SRS Outcome Management
(2023)Purpose: The purpose of this study is to develop and validate two deep learning (DL) models for the management of brain metastasis (BM) patients treated with stereotactic radiosurgery (SRS). The first model is a ... -
Advanced Techniques for Image Quality Assessment of Modern X-ray Computed Tomography Systems
(2016)X-ray computed tomography (CT) imaging constitutes one of the most widely used diagnostic tools in radiology today with nearly 85 million CT examinations performed in the U.S in 2011. CT imparts a relatively high amount ... -
An Aperture-Preserved Approach to Adaptive Radiotherapy of Prostate Cancer Using IMRT and VMAT
(2018)Over the course of a patient’s radiotherapy treatment, there are often changes of internal anatomy relative to the planning CT scan. Because patients are typically treated with a treatment plan created based on one planning ...
