Active shield gradient coil for nuclear magnetic resonance imagi

Details Active shield gradient coil for nuclear magnetic resonance imagi Active shield gradient coil for nuclear magnetic resonance imagi

1995-09-15

1998-01-13

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01V 300

Patent

active

057083606

ABSTRACT:
An active shield gradient coil for a nuclear magnetic resonance imaging, formed by a primary coil having a fingerprint shaped current distribution formed on an inner cylinder in which at least a part of current return lines is cut out, a shield coil having a current distribution formed on an outer cylinder, and a bridging connection member for connecting cut out part of the current return lines of the primary coil with the shield coil, in which the current distribution of the shield coil is a composition of a first shield pattern for cancelling out a magnetic field produced by the primary coil outside the outer cylinder and a second shield pattern for cancelling out a magnetic field produced by the bridging connection member outside the outer cylinder. The current distribution of the primary coil can have turn back current paths for leading the cut out part of the current return lines on one end of the gradient coil to another end of the gradient coil.

REFERENCES:
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patent: 5563567 (1996-10-01), Westphal
Wong et al., Society of Magnetic Resonance in Medicine, Book of Abstracts. vol. 1, "Short Cylindrical Tranverse Gradient Ciols Using Remote Current Return", p. 583, (1992).
Abduljail et al., Proceddings of the Society of Magnetic Resonance in Medicine, vol. 3, "Torque Compensated Asymmetric Gradient Coils for EPI", p. 1306, (1993).
Abduljail et al., Magnetic Resonance in Medicine, vol. 31, "Torque Free Asymmetric Gradient Coils for Echo Planar Imaging", pp. 450-453, (1994).
Carlson et al., "Design and Evaluation of Shielded Gradient Coils", Magnetic Resonance In Medicine No. 26, (1992), pp. 191-206.
Myers et al., Society of Magnetic Resonance in Medicine, Book of Abstracts, vol. 2, "Highly Linear Asymmetric Transverse Gradient Coil Design for Head Imaging", p. 711, (1991).

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