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SMART MANIFOLD FOR MAGNETIC RESONANCE (MR) GRADIENT COILS

IP.com Disclosure Number: IPCOM000248091D
Publication Date: 2016-Oct-25
Document File: 2 page(s) / 10K

Publishing Venue

The IP.com Prior Art Database

Abstract

A technique to improve cooling efficiency of gradient coils of a magnetic resonance imaging (MRI) system is proposed. The technique includes a system of manifold valves that is designed to change cooling between circuits that are based on a pulse sequence diagram (PSD), and an alternating current (AC) frequency content of a gradient. According to an embodiment, a combination of AC resistance modeling of the gradient with the PSD enables more efficient gradient cooling through a system

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SMART MANIFOLD FOR MAGNETIC RESONANCE (MR) GRADIENT COILS

BACKGROUND

The present invention relates generally to a magnetic resonance imaging (MRI) system and more particularly to a technique for improving cooling efficiency of gradient coils of the MRI system.

Generally, three sets of gradient coils are used in a magnetic resonance imaging (MRI) system. The sets of gradient coils include X, Y, and Z gradients. Each coil set is driven by an independent power amplifier and creates a gradient field whose z-component varies linearly along X, Y, and Z directions, respectively. When the power amplifier drives a single axis, the power generated is deposited in the gradient coil. However, the power deposited in the gradient coil is not completely generated in the driven axes, but, due to eddy current, power is generated in other axis in the gradient coil.

In a typical gradient coil, the coil stackup is configured, such that, the X and Y gradients heavily couple to the Z gradient but not vice-versa. Thermal heat dissipation is not constrained to the driven axes of the gradient coil, but, the heat dissipation is transposed onto other parts of the gradient coil via eddy currents.

Therefore, it would be desirable to have a technique to improve cooling efficiency of the gradient coils of the MRI system.

DETAILED DESCRIPTION

A technique to improve cooling efficiency of gradient coils of a magnetic resonance imaging (MRI) system is proposed. The technique includes a system of manifold valves that is designed to change cooling between circuits that are based on a pulse sequence diagram (PSD), and an alternating current (AC) frequency content of a gradient.

The system of manifold valves is based on AC resistance simulation of the gradient coil. The system of val...