STUDIES IN OPTIMIZATION FOR MAGNETIC RESONANCE IMAGING

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" STUDIES IN OPTIMIZATION FOR MAGNETIC RESONANCE IMAGING "

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	149415
Doc. No	:	ET21207
Main Entry	:	TIMOTHY PATRICK EAGAN
Title Proper	:	STUDIES IN OPTIMIZATION FOR MAGNETIC RESONANCE IMAGING
Note	:	This document is digital این مدرک بصورت الکترونیکی می باشد
Abstract	:	Methods for designing coils with optimal performance for use in MRI systems arepresented here. A method called 'supershielding' is described and utilized to designactively shielded gradient coils. In solving these problems, a functional optimizationsubject to constraints has been successful using Lagrange multipliers. An iterativeapproach based on a variational approach has also been very successful, as well. Thesetechniques help one to design a gradient coil that minimizes image distortions dueto field inhomogeneities caused by eddy currents on surrounding metal surfaces. Theabsolute limits of shielding using an open shield are also considered and discussed.The supershielding approach is applied to the gradients in an open-MRI system.For rf coil design, the problem of determining the normal mode frequencies ofsome LC network is paramount. A method for finding closed-form solutions for thenormal mode frequencies of systems with circulant ( ) symmetry is investigated..
Subject	:	Electericl tess
	:	برق
electronic file name	:	TL44359.pdf
Title and statement of responsibility and	:	STUDIES IN OPTIMIZATION FOR MAGNETIC RESONANCE IMAGING [Thesis]