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METHOD FOR DESIGNING GRADIENT COILS FOR MRI SYSTEMS, GRADIENT COILS FOR MRI SYSTEMS OBTAINED BY THE SAID METHOD AND MRI SYSTEM COMPRISING SUCH GRADIENT COILS

  • US 20200132791A1
  • Filed: 07/12/2019
  • Published: 04/30/2020
  • Est. Priority Date: 07/09/2018
  • Status: Active Grant
First Claim
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1. Method for designing gradient coils,the gradient coils providing for a current distribution on the lateral surface of an elliptical cylinder generating a field being perpendicular to the longitudinal axis of the elliptical cylinder,the method comprising the following steps:

  • a) defining an imaging volume as an ellipsoid;

    b) defining an elliptic-cylindrical surface enclosing the said ellipsoid;

    c) defining the current density at each point of the surface by a series of basis functions and corresponding coefficients expressed in elliptic cylindrical coordinates;

    d) describing the magnetic field generated at a generic point by the above defined current density integrated all over the said entire elliptic-cylindrical surface;

    e) determining the values of the coefficients of the basis functions by solving the inverse function for describing the magnetic field;

    f) generating a discrete winding patter of a gradient coil by using a stream function method from the continuous current density and by using a series of scattered contours of the stream function as the design of the winding patters according to a set total number of windings.

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