Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485412
Title: Three-Dimensional Magnetic Resonance Imaging with Mechanically Scanned Interventional Surface Coils
Author: Foley, Christopher
Awarding Body: Imperial College London (University of London)
Current Institution: Imperial College London
Date of Award: 2007
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Abstract:
A method to create three-dimensional images is demonstrated by using colonoscopy in magnetic resonance imaging (MRI) as an application. A stack of twodimensional images is acquired by moving an internal surface coil along the structure of interest and using the images as the basis for creating the three-dimensional image.. Spatial information about the individual two-dimensional images is required in order to t' correctly build the three-dimensional image: Specialised tracking coils for the colonoscope have been constructed to provide the location and orientation needed for each image acquired from an imaging coil that can be mounted on the colonoscope. The tracking coils are used for both acquiring positional information and for defining the location for scanning. Hence, as the colonoscope moves in the' body, the scan plane will change accordingly. Images and tracking data were collected from experiments using an MRI scanner, cylindrical phantoms to mimic the colorectum, and a colonoscope coil mounted on a mock colonoscope that also housed the tracking coils. Image processing techniques were used to filter each image and to correct for the falloff of the signal as the distance increased from the imaging coil. Bilateral filtering was based on noise estimates determined in each image. In combining the images and by using surface rendering, the creation of a threedimensional model that has a superior signal to noise ratio at the clinically relevant depth compared to an external coil is demonstrated.
Supervisor: Not available Sponsor: Not available
Qualification Name: Imperial College London, 2007 Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.485412  DOI: Not available
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