US 2022/0179022 A1Published application

Method for designing electromagnetic coils with explicit peripheral nerve stimulation constraint based on an oracle penalty

AssigneeThe General Hospital Corporation

InventorsMathias Davids, Bastien Guerin, Lawrence L. Wald

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Abstract

Systems and methods for designing and manufacturing electromagnetic coils for use with a magnetic resonance imaging (“MRI”) system are described. More particularly, described here are methods for designing and manufacturing gradient coils for producing magnetic field gradients with greater peripheral nerve stimulation (“PNS”) thresholds relative to conventional gradient coils. The gradient coil design is constrained using an oracle penalty that is computed to account for a PNS requirement for the coil. In other applications, the oracle penalty can be used to optimize driving patterns for an electromagnetic stimulation system, such that a target PNS requirement is achieved.

Claims23

Dependent claims

A method of manufacturing an electromagnet coil for use in a magnetic resonance imaging (MRI) system, the method comprising:

(a) computing a peripheral nerve stimulation (PNS) oracle penalty using a computer system, the PNS oracle penalty comprising a parameter representative of a PNS requirement for the electromagnetic coil;
(b) setting a plurality of performance metric requirements for a plurality of performance metrics for the electromagnet coil using the computer system;
(c) forming a performance functional, using the computer system, for generating a current density pattern over a coil surface for the electromagnetic coil, wherein the performance functional is based on the plurality of performance metrics and the PNS oracle penalty;
(d) optimizing the performance functional based on the PNS requirement and the plurality of performance metric requirements using the computer system;
(e) generating a current density pattern over the coil surface based on the optimized performance functional;
and
(f) obtaining coil windings from the current density pattern.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/442,808Filed 26 Mar 2020
Priority: 27 Mar 2019
Published: 9 Jun 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

G01R 33/288
Details of apparatus provided for in groups G01R33/44 - G01R33/64: provisions within MR facilities for enhancing safety during MR, e.g. reduction…
G01R 33/3858
Using gradient magnetic field coils: manufacture and installation of gradient coils, means for providing mechanical support to parts of the…
A61N 2/006
Specially adapted for a specific therapy: for magnetic stimulation of nerve tissue
A61N 2/02
Magnetotherapy: using magnetic fields produced by coils, including single turn loops or electromagnets