首页>
外国专利>
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
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
A method for designing gradient coils includes 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.
展开▼