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 11 of 11 for “"pressure mapping"”.
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Comparative Analysis of Pressure Mapping Methods in Repaired Tetralogy of Fallot: Four-Dimensional Blood Flow Hemodynamics Assessment and Development of a Novel Pressure Mapping Tool
… the load on the right ventricle, blood flow pressure, and pulmonary hemodynamics. Pressure mapping, obtained through 4D-flow magnetic resonance imaging (4D-flow MRI), has been applied to identify abnormal heart hemodynamics in CHD. Hence, the aim of this research was to compare pressure drop …
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Advanced design and experimental validation of MRI contrast agents for fluid pressure mapping using microbubbles
This work is related to monitoring fluid pressure using Magnetic Resonance Imaging or MRI and includes numerical simulations and experimental MRI. The nature of this study is such that techniques other than MRI have been extensively used to assess the contrast agent for its physical behaviour. …
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An investigation into interface pressure (ip) risk of healthy volunteers on modern medical imaging and radiotherapy tables
Background and RationalePressure ulcers (PUs) present significant threats to patients and cost billions of total healthcare expenditure. In radiography/radiotherapy, a potential for high interface pressure (IP) on radiography/radiotherapy tables may exist, however no study has investigated this to …
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A Wearable Device to Inform Pressure Injury Prevention Support Surfaces Selection and Design
Pressure injuries are a preventable but persistent medical challenge, with 2.5 million Americans developing pressure injuries each year. Pressure injuries are uniquely challenging to manage for wheelchair users, who have to sit for extended periods of time, up to 10-12 hours per day. Measuring the …
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The design and performance of a low-cost inflatable wheelchair seat cushion
… cushions is vital to preventing life-threatening pressure sores, but high quality air cushions are often too expensive and inaccessible for many people. Given the prevalence of pressure sores, there is a need for a more accessible alternative to expensive air cushions. The design of a low-cost …
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Sand Deformation Mechanisms and Earth Pressures Mobilised with Retaining Wall Movements
… of sand deformation mechanisms and earth pressure behaviours mobilised with retaining wall movements. The first group of six centrifuge tests was conducted to investigate loose and dense Hostun sand behaviours with a complete set of rigid wall movement modes, i.e. rotation about the base, …
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Evaluation of image receptor angulation during mediolateral oblique positioning for optimised pressure and area distribution in mammography
… angle of IR during MLO positioning for optimised pressure and area distribution; this in turn may help reduce pain and discomfort associated with the procedure.MethodThe experimental work described in this report is in two phases. Phase one was an anthropomorphic phantom study to establish a …
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Experimental technique for studying high-temperature phase equilibria in reactive molten metal based systems
… samples, as opposed to more traditional pressure mapping of the acoustic field. The size range of samples that could be reliably heated and quenched in this setup was determined to be on the order of 1-3 mm. In microgravity experiments, small spherical specimens (1-2 mm diameter), …
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Automatic Segmentation of Pressure Images Acquired in a Clinical Setting
One of the major obstacles to pressure ulcer research is the difficulty in accurately measuring mechanical loading of specific anatomical sites. A human motion analysis system capable of automatically segmenting a patient's body into high-risk areas can greatly improve the ability of researchers …
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Mapping and assessing ecosystem threat status of South African kelp forests
… kelp forest distribution, ecosystem functioning, pressures, and ecosystem state are key requirements for effective management. The South African National Biodiversity Assessment (NBA) synthesises research to report on the status of ecosystems to guide policy, planning and decision making. Kelp …
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Error Sensor Placement for Active Control of an Axial Cooling Fan
… stated, reveals the location of near-field pressure nulls that may be used to optimize error sensor placement. The actual locations of these near-field pressure nulls for both an axial cooling fan and a monopole loudspeaker were measured over a two-dimensional grid with a linear array of …