منابع مشابه
Zoomed EPI-DWI of the Pancreas Using Two-Dimensional Spatially-Selective Radiofrequency Excitation Pulses
BACKGROUND Implementation of DWI in the abdomen is challenging due to artifacts, particularly those arising from differences in tissue susceptibility. Two-dimensional, spatially-selective radiofrequency (RF) excitation pulses for single-shot echo-planar imaging (EPI) combined with a reduction in the FOV in the phase-encoding direction (i.e. zooming) leads to a decreased number of k-space acquis...
متن کاملFast joint design method for parallel excitation radiofrequency pulse and gradient waveforms considering off-resonance.
A fast parallel excitation pulse design algorithm to select and to order phase-encoding (PE) locations (also known as "spokes") of an Echo-Volumar excitation k-space trajectory considering B(0) field inhomogeneity is presented. Recently, other groups have conducted research to choose optimal PE locations, but the potential benefit of considering B(0) field inhomogeneity during PE location selec...
متن کاملReduced field-of-view excitation using second-order gradients and spatial-spectral radiofrequency pulses.
The performance of multidimensional spatially selective radiofrequency (RF) pulses is often limited by their long duration. In this article, high-order, nonlinear gradients are exploited to reduce multidimensional RF pulse length. Specifically, by leveraging the multidimensional spatial dependence of second-order gradients, a two-dimensional spatial-spectral RF pulse is designed to achieve thre...
متن کاملAn On-the-Fly Radiofrequency Pulse for Bilateral Excitation with Independently Modulated Phase
INTRODUCTION: Numerous applications of MRI can benefit from imaging multiple 3D volumes, such as breast, kidney, and lower extremity imaging. As with 3D imaging compared to multislice imaging, simultaneous excitation of all volumes can improve the signal-to-noise ratio (SNR) of the acquisition compared to sequential imaging of each volume [1], is particularly useful for dynamic imaging of contr...
متن کاملPulsed Radiofrequency, Water-Cooled Radiofrequency, and Cryoneurolysis
Sluijter et al.8 assumed that, because the tissue temperature was kept below the thermal destructive range, thermal tissue injury was avoided. By using mathematical calculations, they further showed that the high-density electrical currents generated at the electrode tip stressed the cellular membranes and biomolecules and caused altered cell function, leading to cell injury. Later investigator...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Current Protocols in Magnetic Resonance Imaging
سال: 2007
ISSN: 2572-5637,2572-5637
DOI: 10.1002/0471142719.mib0202s14