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 22 for “"Phantom Studies"”.
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Positron Emission Tomography Phantom Studies for Radiation Therapy Target Delineation
… for cylindrical, spherical, cubic, and geodesic phantoms at various signal to background ratios (SBRs). Phantom studies revealed that as the SBR decreases the required threshold increases. Also, smaller phantom volumes required a larger threshold than larger phantom volumes. Phantom studies …
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"""cat""-Ology: Spectrally Resolved Neurophotonics in the Mammalian Brain and Phantom Studies"
Physicists provide significant contributions to the field of Biology and Medical Sciences by applying basic physics principles to the field. Specifically, in this work, we probed the light-matter interactions in the NIR region to understand physiological processes in the mammalian brain. We sought …
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Cat-ology spectrally resolved neurophotonics in the mammalian brain and phantom studies
Physicists provide significant contributions to the field of Biology and Medical Sciences by applying basic physics principles to the field. Specifically, in this work, we probed the light-matter interactions in the NIR region to understand physiological processes in the mammalian brain. We sought …
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Validation Platform for Ultrasound-Based Monitoring of Thermal Ablation
… test-bed prototype was evaluated using phantom experiments to identify the shortcomings and limitations. In order to develop an improved validation platform, a simulator was implemented for evaluating registration methods as well as different line fiducial structures. New fiducial line …
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Bioelectrical strategies for image-guided therapies
… the method in numerical simulations and phantom studies. Due to the rapidity of arrhythmic origin localization, ISGA may prove a highly effective means of guiding the ablative therapy of hemodynamically-unstable VT. The second method, the Bioelectrical Image Guidance (BIG) Method, is a …
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Magnetic Resonance Elastography of the Brain: from Phantom to Mouse to Man
… three kinds of MRE experiments, conducted in phantom: physical model), mouse, and man. Phantom studies provide a means to experimentally confirm the accuracy of MRE estimates of viscoelastic parameters in relatively simple materials and geometries. Studies in the mouse provide insight into the …
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Improved Techniques For Acquisition and Analysis of Dynamic Contrast-Enhanced Magnetic Resonance Imaging For Detecting Vascular Permeability In The Central Nervous System
… proposed methods was verified by simulations and phantom studies. As part of this work, the proposed techniques were applied to an in vivo DCE-MRI study of experimental spinal cord injury (SCI). These methods have shown robust results and allow quantitative assessment of regions with very low …
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Statistical methods for quantification of voxel-level image noise in PET/CT imaging
… methods are verified by extensive experimental studies, including numeric simulation, uniform physical phantom studies, and re-binning lung cancer image data. We found the similarity between the spatial autocorrelation estimated by normalizing single PET image data and the one of uniform …
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Immobilization and Catheter Guidance for Breast Brachytherapy Using Patient-Specific Templates
… insertion was designed and fabricated for use on phantom studies. Template creation is based on a virtual reality reconstruction of the patient's anatomy from computed tomography imaging. The template fits on the patient's breast, immobilizing the soft tissue, to provide pre-planned catheter …
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Image processing techniques in nuclear medicine
… <br></br><br></br>Hepatic perfusion imaging studies with <sup>99</sup>Tc<sup>m</sup>-tin colloid were performed in patients with primary colorectal carcimma. The hepatic perfusion index performed poorly in the detection of those patients with occult or overt hepatic metastastes, as did mean …
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Safe anatomy-driven tracking for navigation and robotics in medical and surgical procedures
… workflows in medical and surgical procedures. Phantom studies, ex-vivo validations, and preliminary user evaluations confirm that both platforms attain sub-millimeter accuracy while substantially mitigating workflow or resource requirements for both procedures described in this work. These …
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Quantifying tympanic membrane dynamics in otitis media using low coherence interferometry
… and the middle ear pressure (MEP). Followed by phantom studies and human subject testing, a total of 42 ear datasets from pneumatic LCI system and tympanometry were acquired from 30 pediatric outpatient subjects at Carle Foundation Hospital (Urbana, IL) to assess the clinical significance in …
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Development and Validation of Mechatronic Systems for Image-Guided Needle Interventions and Point-of-Care Breast Cancer Screening with Ultrasound (2D and 3D) and Positron Emission Mammography
… of early-stage breast cancers. Validation and phantom studies showed accurate needle positioning and 3D spatial sampling under simulated PEM localization. Subsequently, a whole-breast spatially-tracked 3DUS system for point-of-care screening was developed, optimized, and validated within a …
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Evaluating Bone by Ultrasound
… of fracture risk. Computer simulations and phantom studies were adopted to guide the measurement of bone properties. In the computer simulations, the cellular model and the wire model of cancellous bone predict the backscattering dependence on porosity from two different perspectives, but …
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Quantifying Magnetic Moments And Susceptibilities Of Small Cylindrical And Spherical Objects In Mri
… glass beads, and the gadolinium doped straw in phantom studies with different MR imaging parameters from a 1.5T and 3.0T machines have been conducted to test the robustness of this method. This method also quantified the magnetic moments and susceptibility of cerebral veins in human images from …
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Technical Development of Hyperpolarized [1-13C]Pyruvate Imaging for Clinical Translation
… with prostate cancer patients, translational studies using this imaging technique have been focused on demonstrating the feasibility of applying to healthy subjects and patients under several pathophysiological conditions. However, there are multiple remaining technical limitations to overcome …
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3D Reconstruction of Patient Specific Bone Models for Image Guided Orthopaedic Surgery
… by introducing 3D anatomical visualisation. Studies conducted on femur fracture reduction has confirmed that computer-aided systems can significantly improve the accuracy of orthopaedic procedures by augmenting the current 2D image guidance with an interactive display of 3D bone models. This …
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Use of Positron Emission to mography For Proton Therapy Verification
… information. We tested this approach using a phantom consisting of sections composed of different combinations of <sup>12</sup>C and <sup>16</sup>O irradiated using a mono-energetic and a SOBP proton beam. In addition, two patient studies were also evaluated using the same technique …
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Power doppler ultrasound for peripheral perfusion imaging
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Myocardial Perfusion Imaging With Rb-82 PET
… hard- and software enables rapid PET studies with high patient throughput. Rubidium-82 (82Rb) is a PET perfusion imaging agent that has a shot half-life of 76 seconds which enables multiple sequential data acquisitions in a short duration of time. It also reduces the number of …
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