Ching-Yi Hsieh

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A new procedure for accurately measuring effective magnetic moments of long cylinders is presented. Partial volume, dephasing and phase aliasing effects are naturally included and overcome in our approach. Images from a typical gradient echo sequence at one single echo time are usually sufficient to quantify the effective magnetic moment of a(More)
PURPOSE This work quantifies magnetic susceptibilities and additional frequency shifts derived from different samples. METHODS Twenty samples inside long straws were imaged with a multiecho susceptibility weighted imaging and analyzed with two approaches for comparisons. One approach applied our complex image summation around a spherical or cylindrical(More)
_________________________________________ Advisor Date _________________________________________ _________________________________________ _________________________________________ _________________________________________ ii DEDICATION This dissertation is dedicated to my parents: Jianwu Liu Guizhi Xi iii ACKNOWLEDGMENTS I would like to thank three(More)
A new method is developed to measure the magnetic susceptibilities and radii of small cylinder-like objects at arbitrary orientations accurately. This method for most biological substances only requires a standard gradient echo sequence with one or two echo times, depending on the orientation of an object relative to the main magnetic field. For objects(More)
PURPOSE The purpose of this work is to develop a method for accurately quantifying effective magnetic moments of spherical-like small objects from magnetic resonance imaging (MRI). A standard 3D gradient echo sequence with only one echo time is intended for our approach to measure the effective magnetic moment of a given object of interest. METHODS Our(More)
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