Mitchell D G
Thomas Jefferson University Hospital and Jefferson Medical College, Department of Radiology, Philadelphia, PA 19107.
Magn Reson Q. 1993 Jun;9(2):84-112.
The appropriate use of various MRI pulse sequences allows accurate detection and characterization of focal liver lesions. There are now a wide array of useful techniques for obtaining T1-weighted and T2-weighted images with or without suspended respiration. In the vast majority of cases, malignant liver lesions can be distinguished from hemangiomas or cysts, although contrast agents may be necessary. MRI can also definitively identify lipid and iron within hepatic parenchyma, increasing its usefulness for diagnosing and evaluating diffuse liver diseases. The expanded tissue contrast of MRI allows better differentiation of malignancies and "pseudotumors" due to diffuse liver disease. Appropriate two-dimensional time-of-flight techniques depict abdominal vessels clearly, allowing accurate detection or exclusion of hepatic vascular disorders. There is no other single method that can be used to examine the liver as comprehensively.
合理使用各种MRI脉冲序列可准确检测和鉴别肝脏局灶性病变。现在有大量有用的技术可用于在屏气或不屏气的情况下获取T1加权和T2加权图像。在绝大多数情况下，尽管可能需要使用对比剂，但恶性肝脏病变可与血管瘤或囊肿相鉴别。MRI还能明确识别肝实质内的脂质和铁，提高其在诊断和评估弥漫性肝病方面的效用。MRI扩展的组织对比度有助于更好地区分恶性肿瘤和弥漫性肝病所致的“假肿瘤”。合适的二维时间飞跃技术能清晰显示腹部血管，从而准确检测或排除肝血管疾病。没有其他单一方法能如此全面地用于检查肝脏。
