Shailesh B. Raval

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CONCLUSION: Stimulation current thresholds to evoke CSNAPs were similar between DSIs and native skin. Elicitation of CSNAPs was reliable even at high stimulation frequencies. Varying the stimulation current applied to DSIs produced differential CSNAP potentials characteristic of native afferent signaling amplitudes. These fi ndings suggest that patterned(More)
The purpose of this study is to develop and evaluate a custom-designed 7  T MRI coil and explore its use for upper extremity applications. An RF system composed of a transverse electromagnetic transmit coil and an eight-channel receive-only array was developed for 7  T upper extremity applications. The RF system was characterized and evaluated using(More)
OBJECTIVE The purpose of this study was to explore the efficacy of Ultra-high field [UHF] 7 Tesla [T] MRI as compared to 3T MRI in non-contrast enhanced [nCE] imaging of structural anatomy in the elbow, forearm, and hand [upper extremity]. MATERIALS AND METHOD A wide range of sequences including T1 weighted [T1] volumetric interpolate breath-hold exam(More)
PURPOSE To optimize the design of radiofrequency (RF) shielding of transmit coils at 7T and reduce eddy currents generated on the RF shielding when imaging with rapid gradient waveforms. METHODS One set of a four-element, 2 × 2 Tic-Tac-Toe head coil structure was selected and constructed to study eddy currents on the RF coil shielding. The generated eddy(More)
OBJECTIVE The purpose of this study is to design an anthropomorphic heterogeneous head phantom that can be used for MRI and other electromagnetic applications. MATERIALS AND METHODS An eight compartment, physical anthropomorphic head phantom was developed from a 3T MRI dataset of a healthy male. The designed phantom was successfully built and(More)
A four-channel Tic-Tac-Toe (TTT) transmit RF coil was designed and constructed for foot and ankle imaging at 7T MRI. Numerical simulations using an in-house developed FDTD package and experimental analyses using a homogenous phantom show an excellent agreement in terms of B1+ field distribution and s-parameters. Simulations performed on an anatomically(More)
INTRODUCTION: Reconstructive transplantation is a clinical reality with more than a dozen countries across the world performing unilateral and bilateral transplantation [1]. Statistics indicate that (i) upper extremity (UE) trauma constitutes 39% of combat injuries [2-4] ii) As of 2005, 1.6 million civilians with limb-loss (34000 major-UE-loss[2]) in the US(More)
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