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 正常腦和脊髓的MRI上,腦(脊髓)髓質(zhì)比皮質(zhì)氫質(zhì)子的數(shù)目少,其T1和T2值較短,故T1WI上腦髓質(zhì)信號(hào)高于腦皮質(zhì),T2WI則稍低于腦皮質(zhì)。腦脊液T1WI為低信號(hào),T2WI為高信號(hào)。脂肪組織T1WI和T2WI均為高信號(hào)。骨皮質(zhì)、鈣化和腦膜組織的氫質(zhì)子很少 (共 189 字) [閱讀本文] >>