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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 …
High-Resolution Mri For 3d Biomechanical Modeling: Signal Optimization Through Rf Coil Design And Mr Relaxometry, James A. Badal
High-Resolution Mri For 3d Biomechanical Modeling: Signal Optimization Through Rf Coil Design And Mr Relaxometry, James A. Badal
Theses and Dissertations
Computed Tomography (CT) is often used for building 3D biomechanical models of human anatomy. This method exposes the subject to a significant x-ray dose and provides limited soft-tissue contrast. Magnetic Resonance Imaging (MRI) is a potential alternative to CT for this application, as MRI offers significantly better soft-tissue contrast and does not expose the subject to ionizing radiation. However, MRI requires long scan times to achieve 3D images at sufficient resolution, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR). These long scan times can make subject motion a problem. This thesis describes my work to reduce scan time while achieving sufficient …