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Full-Text Articles in Medicine and Health Sciences
Improving Mri Surface Coil Decoupling To Reduce B1 Distortion, Christian K. Larson
Improving Mri Surface Coil Decoupling To Reduce B1 Distortion, Christian K. Larson
Theses and Dissertations
As clinical MRI systems continue to advance, larger focus is being given to image
uniformity. Good image uniformity begins with generating uniform magnetic fields, which
are easily distorted by induced currents on receive-only surface coils. It has become an
industry standard to combat these induced currents by placing RF blocking networks on
surface coils. This paper explores the effect of blocking network impedance of phased array surface coils on B1 distortion. It has been found and verified, that traditional approaches for blocking network design in complex phased arrays can leave undesirable B1 distortions at 3 Tesla. The traditional approach of …
Quantitative Mri Correlates Of Hippocampal And Neocortical Pathology In Intractable Temporal Lobe Epilepsy, Maged Goubran
Quantitative Mri Correlates Of Hippocampal And Neocortical Pathology In Intractable Temporal Lobe Epilepsy, Maged Goubran
Electronic Thesis and Dissertation Repository
Intractable or drug-resistant epilepsy occurs in over 30% of epilepsy patients, with many of these patients undergoing surgical excision of the affected brain region to achieve seizure control. Advances in MRI have the potential to improve surgical treatment of epilepsy through improved identification and delineation of lesions. However, validation is currently needed to investigate histopathological correlates of these new imaging techniques. The purpose of this work is to investigate histopathological correlates of quantitative relaxometry and DTI from hippocampal and neocortical specimens of intractable TLE patients. To achieve this goal I developed and evaluated a pipeline for histology to in-vivo MRI …
Multiparametric Imaging And Mr Image Texture Analysis In Brain Tumors, Harish A. Sharma
Multiparametric Imaging And Mr Image Texture Analysis In Brain Tumors, Harish A. Sharma
Electronic Thesis and Dissertation Repository
Discrimination of tumor from radiation injured (RI) tissues and differentiation of tumor types using noninvasive imaging is essential for guiding surgical and radiotherapy treatments are some of the challenges that clinicians face in the course of treatment of brain tumors. The first objective in this thesis was to develop a method to discriminate between glioblastoma tumor recurrences and radiation injury using multiparametric characterization of the tissue incorporating conventional magnetic resonance imaging signal intensities and diffusion tensor imaging parameters. Our results show significant correlations in the RI that was missing in the tumor regions. These correlations may aid in differentiating between …