{"id":209107,"date":"2024-03-21T14:06:00","date_gmt":"2024-03-21T14:06:00","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/mri%e3%81%ae%e5%8e%9f%e7%90%86-%e6%96%b9%e7%a8%8b%e5%bc%8f%e3%81%ae%e8%a7%a3%e8%aa%ac%e3%81%a8%e5%bf%9c%e7%94%a8\/"},"modified":"2024-05-17T15:07:19","modified_gmt":"2024-05-17T15:07:19","slug":"mri%e3%81%ae%e5%8e%9f%e7%90%86-%e6%96%b9%e7%a8%8b%e5%bc%8f%e3%81%ae%e8%a7%a3%e8%aa%ac%e3%81%a8%e5%bf%9c%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/mri%e3%81%ae%e5%8e%9f%e7%90%86-%e6%96%b9%e7%a8%8b%e5%bc%8f%e3%81%ae%e8%a7%a3%e8%aa%ac%e3%81%a8%e5%bf%9c%e7%94%a8\/","title":{"rendered":"MRI\u306e\u539f\u7406 | \u65b9\u7a0b\u5f0f\u306e\u89e3\u8aac\u3068\u5fdc\u7528"},"content":{"rendered":"

MRI\u306e\u539f\u7406\u3068\u65b9\u7a0b\u5f0f\u306e\u89e3\u8aac\u3002\u78c1\u6c17\u5171\u9cf4\u753b\u50cf\u6cd5\u306e\u57fa\u672c\u539f\u7406\u3001\u30e9\u30fc\u30e2\u30a2\u5468\u6ce2\u6570\u3001RF\u30d1\u30eb\u30b9\u30b7\u30fc\u30b1\u30f3\u30b9\u3001TR\u3068TE\u3001\u30d5\u30fc\u30ea\u30a8\u5909\u63db\u3092\u8a73\u3057\u304f\u8aac\u660e\u3002<\/p>\n

MRI\u306e\u539f\u7406\u3068\u65b9\u7a0b\u5f0f\u306e\u89e3\u8aac<\/h2>\n

MRI\uff08\u78c1\u6c17\u5171\u9cf4\u753b\u50cf\u6cd5\uff09\u306f\u3001\u78c1\u5834\u3068\u96fb\u78c1\u6ce2\u3092\u4f7f\u3063\u3066\u4f53\u5185\u306e\u8a73\u7d30\u306a\u753b\u50cf\u3092\u53d6\u5f97\u3059\u308b\u6280\u8853\u3067\u3059\u3002\u533b\u7642\u8a3a\u65ad\u306b\u304a\u3044\u3066\u4e0d\u53ef\u6b20\u306a\u30c4\u30fc\u30eb\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u4eca\u56de\u306f\u3001MRI\u306e\u57fa\u672c\u7684\u306a\u539f\u7406\u3068\u3001\u305d\u3053\u3067\u7528\u3044\u3089\u308c\u308b\u91cd\u8981\u306a\u65b9\u7a0b\u5f0f\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n

MRI\u306e\u57fa\u672c\u539f\u7406<\/h2>\n

MRI\u306f\u3001\u300c\u6838\u78c1\u6c17\u5171\u9cf4\u300d\uff08NMR\uff1aNuclear Magnetic Resonance\uff09\u3068\u3044\u3046\u73fe\u8c61\u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u6838\u78c1\u6c17\u5171\u9cf4\u3068\u306f\u3001\u539f\u5b50\u6838\u304c\u7279\u5b9a\u306e\u5468\u6ce2\u6570\u306e\u96fb\u78c1\u6ce2\u306b\u5fdc\u7b54\u3057\u3066\u5171\u9cf4\u3059\u308b\u73fe\u8c61\u3067\u3059\u3002MRI\u88c5\u7f6e\u3067\u306f\u3001\u3053\u306e\u73fe\u8c61\u3092\u5229\u7528\u3057\u3066\u4eba\u4f53\u5185\u306e\u6c34\u7d20\u539f\u5b50\u306e\u5206\u5e03\u3092\u753b\u50cf\u5316\u3057\u307e\u3059\u3002<\/p>\n

\u6c34\u7d20\u539f\u5b50\u306f1\u500b\u306e\u967d\u5b50\u304b\u3089\u6210\u308a\u3001\u3053\u308c\u306f\u78c1\u5834\u5185\u3067\u30b9\u30d4\u30f3\u3068\u547c\u3070\u308c\u308b\u56de\u8ee2\u904b\u52d5\u3092\u3057\u307e\u3059\u3002MRI\u3067\u4f7f\u3046\u78c1\u5834\u306f\u975e\u5e38\u306b\u5f37\u529b\u3067\u3001\u901a\u5e38 1.5\u30c6\u30b9\u30e9\u30843\u30c6\u30b9\u30e9\u7a0b\u5ea6\u3067\u3059\u3002\u967d\u5b50\u304c\u3053\u306e\u78c1\u5834\u306b\u3055\u3089\u3055\u308c\u308b\u3068\u3001\u4e8c\u3064\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u30ec\u30d9\u30eb\u306e\u3069\u3061\u3089\u304b\u306b\u63c3\u3046\u50be\u5411\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u30e9\u30fc\u30e2\u30a2\u5468\u6ce2\u6570<\/h2>\n

\u30e9\u30fc\u30e2\u30a2\u5468\u6ce2\u6570\u3068\u306f\u3001\u5f37\u78c1\u5834\u5185\u3067\u30b9\u30d4\u30f3\u304c\u56de\u8ee2\u3059\u308b\u5468\u6ce2\u6570\u3067\u3059\u3002\u3053\u308c\u306f\u4ee5\u4e0b\u306e\u5f0f\u3067\u8868\u3055\u308c\u307e\u3059\u3002<\/p>\n

\n \\( \\omega_0 = \\gamma B_0 \\)\n<\/div>\n

\u3053\u3053\u3067\u3001\\( \\omega_0 \\) \u306f\u30e9\u30fc\u30e2\u30a2\u5468\u6ce2\u6570\u3001\\( \\gamma \\) \u306f\u30b8\u30e3\u30a4\u30ed\u30de\u30b0\u30cd\u30c6\u30a3\u30c3\u30af\u6bd4\u3001 \\( B_0 \\) \u306f\u5916\u90e8\u78c1\u5834\u306e\u5f37\u3055\u3067\u3059\u3002\u6c34\u7d20\u306e\u5834\u5408\u3001\\( \\gamma \\) \u306e\u5024\u306f\u7d04 42.58 MHz\/T \u3067\u3059\u3002<\/p>\n

\u30d1\u30eb\u30b9\u30b7\u30fc\u30b1\u30f3\u30b9<\/h2>\n

MRI\u3067\u306f\u7279\u5b9a\u306e\u5468\u6ce2\u6570\u3067RF\uff08\u30e9\u30b8\u30aa\u5468\u6ce2\u6570\uff09\u30d1\u30eb\u30b9\u3092\u7167\u5c04\u3059\u308b\u3053\u3068\u3067\u3001\u30b9\u30d4\u30f3\u3092\u63c3\u3048\u3001\u66f4\u306b\u56de\u8ee2\u306e\u4f4d\u76f8\u3092\u540c\u671f\u3055\u305b\u307e\u3059\u3002\u3053\u308c\u306f\u300c\u30d1\u30eb\u30b9\u30b7\u30fc\u30b1\u30f3\u30b9\u300d\u3068\u547c\u3070\u308c\u3001\u753b\u50cf\u5316\u306e\u57fa\u790e\u3068\u306a\u308a\u307e\u3059\u3002RF\u30d1\u30eb\u30b9\u304c\u6b62\u3093\u3060\u5f8c\u3001\u30b9\u30d4\u30f3\u306f\u5143\u306e\u72b6\u614b\u306b\u623b\u308a\u3001\u305d\u306e\u904e\u7a0b\u3067\u4fe1\u53f7\u3092\u653e\u51fa\u3057\u307e\u3059\u3002\u3053\u306e\u4fe1\u53f7\u3092\u691c\u51fa\u30fb\u89e3\u6790\u3059\u308b\u3053\u3068\u3067\u753b\u50cf\u3092\u5f62\u6210\u3057\u307e\u3059\u3002<\/p>\n

\u7e70\u308a\u8fd4\u3057\u6642\u9593\uff08TR\uff09\u3068\u30a8\u30b3\u30fc\u6642\u9593\uff08TE\uff09<\/h2>\n

MRI\u3067\u753b\u50cf\u3092\u53d6\u5f97\u3059\u308b\u969b\u306b\u306f\u3001\u7e70\u308a\u8fd4\u3057\u6642\u9593\uff08TR\uff09\u3068\u30a8\u30b3\u30fc\u6642\u9593\uff08TE\uff09\u3068\u3044\u3046\u30d1\u30e9\u30e1\u30fc\u30bf\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n

– **\u7e70\u308a\u8fd4\u3057\u6642\u9593\uff08TR\uff09\uff1a** \u4e00\u3064\u306eRF\u30d1\u30eb\u30b9\u304b\u3089\u6b21\u306eRF\u30d1\u30eb\u30b9\u307e\u3067\u306e\u6642\u9593\u3002
\n– **\u30a8\u30b3\u30fc\u6642\u9593\uff08TE\uff09\uff1a** RF\u30d1\u30eb\u30b9\u30aa\u30d5\u304b\u3089\u30a8\u30b3\u30fc\u4fe1\u53f7\uff08\u623b\u3063\u3066\u304f\u308b\u4fe1\u53f7\uff09\u304c\u5f97\u3089\u308c\u308b\u307e\u3067\u306e\u6642\u9593\u3002<\/p>\n

TR\u3068TE\u306f\u753b\u50cf\u306e\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u305f\u3081\u3001\u8a3a\u65ad\u76ee\u7684\u306b\u5fdc\u3058\u3066\u8abf\u6574\u3055\u308c\u307e\u3059\u3002<\/p>\n

\u30d5\u30fc\u30ea\u30a8\u5909\u63db<\/h2>\n

\u53d6\u5f97\u3055\u308c\u305f\u4fe1\u53f7\u306f\u3001\u307e\u3060\u76f4\u63a5\u753b\u50cf\u306b\u5909\u63db\u3067\u304d\u308b\u5f62\u5f0f\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u3053\u3067\u7528\u3044\u3089\u308c\u308b\u306e\u304c\u30d5\u30fc\u30ea\u30a8\u5909\u63db\u3067\u3059\u3002\u30d5\u30fc\u30ea\u30a8\u5909\u63db\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u4fe1\u53f7\u306e\u5468\u6ce2\u6570\u6210\u5206\u3092\u5206\u89e3\u3057\u3001\u7a7a\u9593\u60c5\u5831\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\n \\( F(k) = \\int_{-\\infty}^{\\infty} f(x) e^{-2\\pi i k x} \\,dx \\)\n<\/div>\n

\u3053\u3053\u3067\u3001\\( F(k) \\) \u306f\u5468\u6ce2\u6570\u7a7a\u9593\u3067\u8868\u3055\u308c\u308b\u4fe1\u53f7\u3001\\( f(x) \\) \u306f\u305d\u306e\u5bfe\u5fdc\u3059\u308b\u7a7a\u9593\u60c5\u5831\u3067\u3059\u3002MRI\u3067\u306f\u3001\u3053\u308c\u306f3\u6b21\u5143\u30c7\u30fc\u30bf\u306b\u9069\u7528\u3055\u308c\u3001\u8a73\u7d30\u306a3D\u753b\u50cf\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n

\u307e\u3068\u3081<\/h2>\n

MRI\u306e\u539f\u7406\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u6838\u78c1\u6c17\u5171\u9cf4\u3001\u30e9\u30fc\u30e2\u30a2\u5468\u6ce2\u6570\u3001RF\u30d1\u30eb\u30b9\u30b7\u30fc\u30b1\u30f3\u30b9\u3001TR\u3068TE\u3001\u30d5\u30fc\u30ea\u30a8\u5909\u63db\u306a\u3069\u306e\u57fa\u672c\u6982\u5ff5\u304c\u91cd\u8981\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u539f\u7406\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001MRI\u306f\u4eba\u4f53\u5185\u306e\u7cbe\u7dfb\u306a\u753b\u50cf\u3092\u975e\u4fb5\u8972\u7684\u306b\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

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