An inductively coupled wireless radio frequency (RF) coil has been developed to improve the quality in the magnetic resonance imaging. The wireless coils of a Helmholtz type and a birdcage type were manufactured, and the resonance frequency was tuned at 64 MHz. Several magnetic resonance images were taken on a phantom, on a rabbit’s head and on a human knee joint with the RF coils. The signal t...

This paper reports on the design of multidimensional wireless power distribution using cellular concept, Helmholtz coils and cubical node design with power transmission capability over a distance of 6 m. To provide strong and uniform power delivery along the power transfer link axis, pairs of Helmholtz coils which are capable of creating uniform magnetic fields are used. To distribute wireless ...

We describe the design, construction and performance of three realizations of a high-field superconducting magnetic trap for neutral atoms and molecules. Each of these traps utilizes a pair of coaxial coils in the anti-Helmholtz geometry and achieves depths greater than 4 T, allowing it to capture magnetic atoms and molecules cooled in a cryogenic buffer gas. Achieving this depth requires that ...

Objective: In the past, various configurations have been proposed for intravascular imaging coils. Single loop coils [1] are simple to construct, but suffer from a very inhomogeneous spatial sensitivity. Opposed solenoid coils [2] and meander coils [3] solve this problem at the cost of a quick drop-off of the sensitivity in radial direction. A variant of Helmholtz coils (Fig.1) has been propose...

A method of active field cancellation is described, which greatly reduces the stray magnetic field within the trap region of a Bose-Einstein condensation experiment. An array of six single-axis magnetic sensors is used to interpolate the field at the trap center, thus avoiding the impractical requirement of placing the sensor within the trap. The system actively suppresses all frequencies from ...

An inductively coupled wireless coil for a bidirectional radio frequency (RF) probe coil has been designed to improve the signal to noise ratio (SNR) in the magnetic resonance image (MRI). A birdcage type of a primary coil and a Helmholtz type of a wireless secondary coil was manufactured. The coils were applied to a phantom study with a 3 T MRI system. SNR was calculated in the magnetic resona...

The aim of this study is to evaluate the method for compensation magnetic field interference from mains, which consists primarily components with a frequency 50 (60) Hz and its multiples. setup compensates interfering using three Helmholtz coils, sensors, digital processing unit, power amplifiers. unit implements an adaptive least-mean-square (LMS) algorithm calculate currents through coils tha...