gradient coil

gradient coil

An MRI term for any of three paired orthogonal current-carrying coils located within the magnet designed to produce desired gradient magnetic fields, which collectively and sequentially are superimposed on the main magnetic field (Bo) to allow selective spatial excitation of the imaging volume. Gradients are also used to apply reversal pulses for some fast imaging techniques.
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The outer diameter of SimPET is 99 mm and will fit within gradient coil diameters of 100 mm and greater.
The SuperG gradient coil introduces outstanding performance and superb stability, which is designed to deliver the performance of ultra-high-performance, research-class 60 centimeter MRI system in a 70 centimeter bore.
One of the challenges is the acoustic noise from the split gradient coil [1].
Extreme modifications in hardware, such as gradient coil insertion or software upgrades, were excluded from the scope of the paper, but additional gadgets or considerations were discussed for longitudinally scanning small animals under anesthesia while monitoring their vital signs.
Motion of the subject within the gradient coil due to the vibration will result in blurring of the image.
The ability to increase bandwidth is also limited by gradient coil strength.
In vivo fiber tracking in the rat brain on a clinical 3T MRI system using a high strength insert gradient coil. Neuroinnage 35(3):1077-1085, 2007.
Pianissimo[TM] uses special insulators to reduce acoustic noise from the vibration of the gradient coil. Noise is further reduced through a unique gradient vacuum vessel and independent ground support that shields against air vibration.
Gradient coil equipment is expensive/intricate, noisy, power and space demanding, and can induce complex spatiotemporal eddy currents in nearby conducting structures, including the patient [2-4].
Aurora began in 1985 as an engineering firm that specialized in gradient coil design, and it now manufactures the Aurora 1.5T Dedicated Breast MRI System with Bilateral 3-D SpiralRODEO.