J喊共振成像2011年弟2巷第6期Chin JMagnResonImaging,2011,Vol 2,No 6
等的影响,因而更易识别。研究表明,DWI有助于
肝癌和转移瘤等恶性肿瘤的检出 。Lowenthal[¨ 等
研究MR扩散加权成像与Gd.EOB.DTPA增强成像的
对比研究发现Gd.EOB.DTPA增强MR.Late期影像在
肝脏局灶性病灶检出上更有优势,DWI对于识别小
的转移灶更有价值。
本研究的局限性主要在于病例数不足,测量CR
值时考虑到部分容积效应的影响,入组患者病灶均
大于10 mlTl,未对小于10 mm的病灶进行检出率的研
究,尚需扩大样本量进一步研究。此外,肝脏局灶
性病变DWI的b值选择需进一步探讨。
综上所述,DWI由于伪影等原因对肝脏局灶性
病变的检出价值有限,但它对于某些特定的病变具
有独特的优势,今后的工作中仍需结合T2压脂序列
与DWI序列对病灶进行分析。
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