Method for constructing a transversal gradient coil in a magnetic resonance imaging system
First Claim
1. A method for constructing a transversal gradient coil formed by a conductor for producing a target field distribution with a prescribed current in a magnetic resonance imaging system, said method comprising the steps of:
- subdividing a surface of a carrier on which said coil is to be disposed by means of a grid mesh network placed over said carrier, said network having grid openings and mesh branches;
occupying each grid opening in said network with a modeled elementary coil in the form of a closed turn, each elementary coil generating a respective magnetic field;
calculating the magnetic field generated by each of said elementary coils;
defining a number of ampere-turns for each elementary coil using a fit algorithm based on said target field distribution;
calculating a number of ampere-turns for each mesh branch by superimposing the ampere-turns for all of the elementary coils elements adjacent each mesh branch and thereby obtaining an ampere-turn density distribution over said network;
successively integrating said ampere-turn density distribution over whole-numbers of turns along an integration path based on said prescribed current to obtain a plurality of points on said carrier; and
positioning said conductor on said carrier in a configuration conforming to said points.
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Accused Products
Abstract
For the purpose of constructing a transversal gradient coil, formed by a conductor, for producing a target field distribution with a prescribed current in a magnetic resonance imaging system, a series of points defining the locations of the coil conductor on a carrier are identified by placing a grid mesh network of elementary saddle coils over the carrier, calculating the magnetic field of these elementary saddle coils and defining a number of ampere-turns for each elementary saddle coil with a fit algorithm on the basis of the target field distribution. The discrete conductor position points are then identified by integration which, in combination, define the path of the coil conductor on the carrier.
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Citations
8 Claims
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1. A method for constructing a transversal gradient coil formed by a conductor for producing a target field distribution with a prescribed current in a magnetic resonance imaging system, said method comprising the steps of:
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subdividing a surface of a carrier on which said coil is to be disposed by means of a grid mesh network placed over said carrier, said network having grid openings and mesh branches; occupying each grid opening in said network with a modeled elementary coil in the form of a closed turn, each elementary coil generating a respective magnetic field; calculating the magnetic field generated by each of said elementary coils; defining a number of ampere-turns for each elementary coil using a fit algorithm based on said target field distribution; calculating a number of ampere-turns for each mesh branch by superimposing the ampere-turns for all of the elementary coils elements adjacent each mesh branch and thereby obtaining an ampere-turn density distribution over said network; successively integrating said ampere-turn density distribution over whole-numbers of turns along an integration path based on said prescribed current to obtain a plurality of points on said carrier; and positioning said conductor on said carrier in a configuration conforming to said points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification