PURPOSE To evaluate the performance of micro-electromechanical systems (MEMS) switches against PIN diodes for switching a dual-tuned RF coil between 19 F and 1 H resonant frequencies for multi-nuclear lung imaging. METHODS A four-element fixed-phase and amplitude transmit-receive RF coil was constructed to provide homogeneous excitation across the lungs, and to serve as a test system for vari...

Introduction: Higher field strengths in MRI are well known for their potential to increase image resolution due to higher signal-to-noise ratio (SNR). However, due to the high dielectric permittivity of human tissue and higher resonance frequencies, and thus shorter wavelengths on the order of the human body size, RF interference artifacts are likely to occur. To overcome these constraints, par...

Purpose To theoretically describe, design, and test the new geometry of birdcage coil for 7 Tesla anatomical brain imaging, which includes a large window on top, without deliberately jeopardizing its homogeneity efficiency. This opencage will not only improve patient comfort but also enable volunteer to follow functional MRI stimuli. design could facilitate tracking compliance better correction...

Landslide susceptibility evaluation is critical for landslide prevention and risk management. Based on the slope unit, this study uses information value method- random forest (IV-RF) model to evaluate in deep valley area. First, based historical data, a inventory was developed by using remote sensing technology (InSAR optical sensing) field investigation methods. Twelve factors were then select...

This protocol describes a signal-to-noise ratio (SNR) calibration and sample preparation method for solenoidal microcoils combined with biological samples, designed high-resolution magnetic resonance imaging (MRI), also referred to as MR microscopy (MRM). It may be used at pre-clinical MRI spectrometers, demonstrated on Medicago truncatula root samples. Microcoils increase sensitivity by matchi...