In radiofrequency (RF) coil design for ultra-high-field magnetic resonance (MR) imaging, short RF wavelengths present various challenges to creating a big volume coil. When imaging a human body using an ultra-high magnetic field MR imaging system (magnetic flux density of 7 Tesla or more), short wavelength may induce artifacts from dielectric effect and other factors. To overcome these problems...

A double coil magnetorheological (MR) valve with an outer annular resistance gap was designed and prototyped. The finite element modeling and analysis of double coil MR valve were carried out using ANSYS/ Emag software, and the optimal magnetic field distribution and magnetic flux density of the double coil MR valve were achieved. The mechanism of the pressure drop was studied by building a mat...

The paper describes a receive coil system for low-field NMR scanner intended for cardio measurements. The coil system is based on good qualities of surface coils accommodating them to volume measurements. The active volume of the coil is widened using two inductively coupled resonators. Signal from the coil system is amplified using a highimpedance preamplifier thus no special matching is neces...

We design a crisscrossed double-layer birdcage (DLBC) coil by modifying the coil geometry of a standard single-layer BC (SLBC) coil to enhance the homogeneity of transmitting magnetic flux density (B1 ) along the main magnetic field (B0)-direction for small-animal magnetic resonance imaging (MRI) at 300 MHz. The performance assessment of the crisscrossed DLBC coil is conducted by computational ...

BACKGROUND AND PURPOSE Coil herniation into the parent artery after detachment is an uncommon complication of embolization of the intracranial aneurysm. We report our experience with stent reconstruction of the lumen and flow of the internal carotid artery (ICA) after coil herniation during embolization for intracranial ICA aneurysms and the possible mechanisms of coil herniation. MATERIALS A...

Number of ingenious experiments to test that their coil was providing. The theory of a Rogowski coil illustrates very well how a coil can be. Provide an elegant experimental demonstration of. rogowski coils suppliers 8 shows.These validate the superior performance of Rogowski coils over conventional. Verified by physical descriptions and experimental results. For comparative purpose, the result...

Multi-coil arrays applied in transcranial magnetic stimulation (TMS) are proposed to accurately stimulate brain tissues and modulate neural activities by an induced electric field (EF). Composed of numerous independently driven coils, a multi-coil array has alternative energizing strategies to evoke EFs targeting at different cerebral regions. To improve the locating resolution and the stimulat...

Compared to traditional ultrasonic detection methods, the electromagnetic acoustic transducer (EMAT) technique can be applied in many hostile environments such as elevated temperatures, on-line inspections, etc. However, the EMAT technique has a low conversion efficiency. This paper develops a numerical model to study the effects of the coil configurations on the conversion efficiency of shear-...

This paper presents a study of the air flow distribution through a residential air-conditioning heat exchanger. The test subject was a finned-tube, A-shaped coil outfitted with a condensation collection pan required for horizontal installation. We examined the air flow distribution approaching and exiting the coil at the rated and a reduced air flow rate, and at two humidity levels. Our measure...

Previous studies on HTS coils can be put into two categories: tape surface coils and thin-film surface coils[1-4]. In this study, we build a whole new Bi2Sr2Ca2Cu2O3 (Bi-2223) superconducting volume coil (length of 8 cm) designed for the mice whole body imaging at Bruker 3T MRI system. The HTS volume coil has 2.3 folds higher S/N than that of the HTS volume coil at 300K for the mice body screen...