Self-shielded gradients and method of designing and...

Details Self-shielded gradients and method of designing and... Self-shielded gradients and method of designing and...

2008-06-03

2008-06-03

Shrivastav, Brij (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

Reexamination Certificate

active

07382133

ABSTRACT:
A self-shielded gradient adapted to be disposed within a main magnet field of an MRI scanner includes a gradient coil having a shield current distribution Jsbased on current density components φnon a gradient surface whereJs=∑n⁢⁢an⁢ϕn.The current distribution is a predetermined value within a volume defined by a periphery of the gradient coil. The current distribution is substantially zero outside the periphery of the gradient coil. According to a method of producing a self-shielded gradient, a shield current distribution Jsis determined based on current density components φnon a gradient surface whereJs=∑n⁢⁢an⁢ϕn,by using an optimization technique, and a gradient coil is constructed according to the shield current distribution. The current distribution is a predetermined value within a volume defined by a periphery of the gradient coil. The current distribution is substantially zero outside the periphery of the gradient coil.

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