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 18 of 18 for “"Breath hold"”.
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Lipid studies in breath-hold diving mammals and obese, pre-diabetic mice.
Lipidology, or the scientific investigation of cellular lipids in biological systems, as well as their pathways and networks, is becoming an increasingly integral component in the investigation of metabolic disease and, outside the healthcare fields, in the elucidation of adaptations to specific …
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CHARACTERIZATION OF BREAST RT TREATMENT BY MULTI-INSTITUTIONAL AI-KNOWLEDGE-BASED PLANNING OPTIMIZATION MODELS
… adequate or if alternative techniques, such as breath-hold CT or Volumetric Modulated Arc Therapy (VMAT), are necessary to optimize therapy and avoid unacceptable doses to the heart. The work is part of the AIRC MIKAPOCO, which has developed multi-institution benchmark models for automatic …
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Implementing an Optical Surface Monitoring System for Left Breast Radiation Therapy
… the left breast where the deep inspiration breath-hold technique is used to limit cardiac dose. I implement a work flow program for properly using the optical surface monitoring system in a clinical environment. Then, I implement a quality assurance program using recommendations from the …
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Radiomics of Nsclc: Quantitative Ct Image Feature Characterization and Tumor Shrinkage Prediction
… cine 4D-CT imaging vs. helical inspiratory breath-hold 3D CT). For each image type, a set of cross-machine reproducible, non-redundant, and informative image features was identified. Compared to end-exhale 4D-CT and breath-hold 3D-CT, average 4D-CT derived image features showed superior …
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Pattern recognition of brain fMRI images for various physiological states
… with different gas mixtures for rest and breath hold task, gave various physiological conditions. These multi-class data were also classified using LS-SVM technique. Feature selection was performed on every data to select out patterns made up of significant voxels using statistical …
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Exploring The Translational Clinical Value of Cerebrovascular Reactivity Assessments by Diffuse Correlation Spectroscopy
… compared to healthy children in response to a breath hold challenge. The ultimate outcome of this work lends support to the clinical value of DCS-measured CVR assessed in a routine outpatient clinical workflow for a pediatric population with sickle cell disease.
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4D Study of Thoracic Cancer Radiation Treatment
… tumor coverage. Deformable image registration holds the key to link the information of two images at various phases. The major purpose of this study is to develop and validate the optical flow method (OFM), a method of deformable image registration by which the image content properties are …
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Understanding adaptive regulation of skeletal muscle physiology in the Weddell seal: a proteomics approach
Air-breathing, diving vertebrates foster unique adaptations to exercise; namely, these animals are able to exercise for prolonged periods of time while "holding" their breath. Weddell seals (Leptonychotes weddellii) routinely undergo progressive hypoxia and ischemia throughout the course of diving …
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Development of MR Thermometry Strategies for Hyperthermia of Extremity and Breast Tumors
… magnetic field system drift, fatty tissue, and breathing motion.</p> <p>The purpose of this research was to develop a system for the hyperthermia treatment of LABC while performing MR thermometry. A hardware system was developed for performing the hyperthermia treatment within the MR bore. …
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Development and Implementation of A Dynamic Heterogeneous Proton Equivalent Anthropomorphic Thorax Phantom For The Assessment of Scanned Proton Beam Therapy
… of this project. Falk Pӧnisch, Ph.D. for his breath hold proton therapy treatment expertise, Matt Palmer and Jaques Bluett for proton dosimetry assistance, Matt Kerr for verification plan assistance, Carrie Amador, Nadia Hernandez, Trang Nguyen, Andrea Molineu, Lynda McDonald for TLD and film …
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Arterial Baroreflex Regulation of Sympathetic Discharge During Maximal Voluntary End-Inspiratory Apnea
… physiological stress. Volitional apnea, seen in breath-hold diving, serves as a physiological stressor and a model to increase sympathetic outflow in human neurophysiological research. The study employed a maximal voluntary end-inspiratory apnea to observe simultaneous increases in muscle …
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Investigation of Deformable Image Registration Based Lung Ventilation Mapping for Radiation Therapy Using a Hybrid Hyperpolarized Gas MRI Technique
… using a novel hybrid technique in a single breath-hold maneuver including a HP Helium-3 ventilation image, a pair of proton MR images, and a pair of HP Helium-3 tagging images at end of inhalation (EOI) and end of exhalation (EOE).</p><p>In order to create a physiologically plausible lung …
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Quantification of Fat Content and Fatty Acid Composition Using Magnetic Resonance Imaging
… technique for abdominal applications in which breath-hold is necessary for acceptable image quality. The use of a bipolar acquisition scheme may be used to reduce the total scan time, but is associated with issues which are detrimental to fat quantification. Using a built-in correction …
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Distortion-optimal parallel MRI with sparse sampling: from adaptive spatio-temporal acquisition to self-calibrating reconstruction
… non-gated cardiac imaging during a short breath-hold. The second part of the dissertation addresses the problems of blind and nonblind perfect inversion of multi-channel multi-rate systems. Driven by applications in multi-sensor imaging systems such as pMRI, we focus on systems wherein …
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Real time motion tracking in image guided focused ultrasound intervention
… technique. The method is currently limited to breath-hold treatments under general anaesthesia that is uncomfortable for patients.<br/>The purpose of this study is to investigate key issues of US and MRI guided real-time target ablation when the target is in free breathing motion state which is …
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Dynamic 129Xe Magnetic Resonance Spectroscopy: Development and Application in Diverse Cardiopulmonary Diseases
… in the spectroscopic parameters during inhale, breath-hold, and exhalation. We observed a distinct cardiogenic oscillation in the amplitude and chemical shift of the RBC peak. This oscillation was quantified by its peak-to-peak height. Furthermore, we identified static and spectral parameters …