PURPOSE To evaluate MR safety at 3 Tesla for a drug eluting coronary stent. METHODS A drug eluting coronary stent (Endeavor, cobalt alloy, Medtronic Vascular, Santa Rosa, CA) was evaluated for magnetic field interactions, heating, and artifacts at 3 Tesla. MRI-related heating was assessed with the stent in a gelled saline-filled phantom using a transmit/received RF body coil with a whole body...

In patients with spinal stenosis, magnetic resonance imaging of the cervical spine can be improved by using 3D driven-equilibrium fast spin echo sequences to provide a high-resolution assessment of osseous and ligamentous structures. However, it is not yet clear whether 3D driven-equilibrium fast spin echo sequences adequately evaluate the spinal cord itself. As a result, they are generally sup...

Introduction: Several magnetic resonance imaging (MRI) applications, such as cardiac imaging and functional MRI, require the use of small Field of View (FOV) imaging to achieve dynamic MR studies. However, using small FOV with Fourier encoding results in aliased images in the phase encoding direction. Several approaches have been used to solve the aliasing problem. Among the proposed techniques...

Abstract. Nuclear spin noise spectroscopy in the absence of radio frequency pulses was studied under influence pulsed field gradients (PFGs) on pure and mixed liquids. Under conditions where radiation-damping-induced line broadening is smaller than gradient-dependent inhomogeneous broadening, echo responses can be observed difference spectra between experiments employing gradient pairs same opp...

abstraCt Background and Purpose: At 7T MRI, T2*-weighted (T2*-w) gradient-echo has been shown to provide high-resolution anatomical images of gray matter (GM) lesions. However, few studies have verified T2* lesions histopathologically, or compared them with more standard techniques at ultra-high field-strength. This study aims to determine the sensitivity of T2-w and T2*-w sequences for detecti...

The goal of this work is to develop software that enables the rapid implementation of custom MRI spectrometers using commercially-available software defined radios (SDRs). The developed gr-MRI software package comprises a set of Python scripts, flowgraphs, and signal generation and recording blocks for GNU Radio, an open-source SDR software package that is widely used in communications research...