勾配コイルは，ＭＲＩの歴史の中で，最も本質的な進歩のあったハードウェアと言ってもいいかも知れません．
現在では，「技術の粋を凝らした」勾配コイルが使われていますが，一番シンプルな勾配コイルは，ｚ方向に関しては，Maxwell pair（マクスウェル・ペア），ｘとｙ方向に関しては，平行４線コイルというものです．
上に示すのは，その原則に忠実に巻いた勾配コイルです．
勾配コイルは，ＭＲＩの歴史の中で，最も本質的な進歩のあったハードウェアと言ってもいいかも知れません．
現在では，「技術の粋を凝らした」勾配コイルが使われていますが，一番シンプルな勾配コイルは，ｚ方向に関しては，Maxwell pair（マクスウェル・ペア），ｘとｙ方向に関しては，平行４線コイルというものです．
上に示すのは，その原則に忠実に巻いた勾配コイルです．
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