It is represented by current potential vector was assigned to the contact of the finite surface elements, the initial value of the current distribution of the current on the surface of the shield coil and primary coil, the magnetic field evaluation of the plurality of the set in at least one of the static magnetic field coil unit and the imaging region It is represented by the magnetic field vector, the point target magnetic field, and the response matrix to the magnetic field vector, in the singular value decomposition of the response matrix, get the singular values, and eigenvalues group of the magnetic field distribution, the eigenvector group of current potential from current potential vector , expressed by a polynomial of the eigenvectors group of current potential, an approximation of the current potential vector is set as the difference target magnetic field the difference between the initial value of the magnetic field vector and the target magnetic field to generate a difference target magnetic field, the coefficient of each term of the polynomial It is determined based on eigenvectors group of the magnetic field distribution and the singular values. Thus, regardless of the cross-sectional shape of the cylindrical shield coil and primary coil, suppress the generation of eddy current is further error magnetic field, to provide a design method of the coil pattern which can improve the quality of the cross-sectional image.主コイルとシールドコイルの電流面上の電流分布の初期値を、有限面要素の接点に割り付けた電流ポテンシャルベクトルで表現し、撮像領域と静磁場コイル装置の少なくとも一方に設定される複数の磁場評価点目標磁場を、磁場ベクトルで表現し、電流ポテンシャルベクトルから磁場ベクトルへの応答行列と、応答行列の特異値分解で、特異値と、磁場分布の固有ベクトル群と、電流ポテンシャルの固有ベクトル群を取得し、目標磁場と磁場ベクトルの初期値の差分を差分目標磁場として設定し、差分目標磁場を発生する電流ポテンシャルベクトルの近似値を、電流ポテンシャルの固有ベクトル群の多項式で表現し、多項式の各項の係数を特異値と磁場分布の固有ベクトル群に基づいて決定する。こうして、主コイルとシールドコイルの筒状の断面形状によらず、誤差磁場さらには渦電流の発生を抑制し、断面画像の画質を向上できるコイルパターンの設計方法を提供する。
