| 摘要 |
The initial values of the current distribution on the current surfaces of a main coil and a shield coil are represented by a current potential vector allocated to the contacts of limited surface elements; a plurality of magnetic field score target magnetic field set to at least one of an imaging area or a static magnetic field coil unit are represented by a magnetic field vector; a singular value, an eigenvector group of magnetic field distribution, and an eigenvector group of current potential are acquired by the response matrix from the current potential vector to the magnetic field vector and the singular value decomposition of the response matrix; the difference between the initial values of the target magnetic field and the magnetic field vector is set as a difference target magnetic field; the approximate value of the current potential vector that produces the difference target magnetic field is represented by a polynomial of the eigenvector group of the current potential; and the coefficient of each of the terms of the polynomial is determined on the basis of the singular value and the eigenvector group of the magnetic field distribution. Thus, provided is a method for designing a coil pattern, whereby the production of an error magnetic field and further an eddy current can be suppressed to improve the quality of a cross-sectional image irrespective of cylindrical cross-sectional shape of the main coil and the shield coil. |
