6[6]De Jong N.Improvements in ultrasound contrast agents[J].IEEE Eng Med Biol,1996,15∶72-82.
7[7]Needleman L,Forsberg F.Contrast agents in ultrasound[J].Ultrasound Quarterly,1996,13(3)∶121-138.
8[8]De Jong N,Hoff L,Skotland T,et al.Absorption and scatter of encapsulated gas filled microspheres:theoretical considerations and some measurements[J].Ultrasonics,1992,30∶95-103.
9[9]Goldberg BB,Liu JB,Forsberg F.Ultrasound contrast agents:a review[J].Ultrasound Med Biol,1994,20(4)∶319-333.
10[10]Anderson AL,Hampton LD.Acoustics of gas-bearing sediments:I.Background[J].J Acoust Soc Am,1980,67∶1865-1889.
5Nguyen BN, Flej ou JF, Terris B, et al. Focal nodular hyperplasia of the liver: a comprehensive pathologic study of 305 lesions and recognition of new histologic forms. Am J Surg pathol 1999, 23(12): 1441-1454.
6Kamel IR, Liapi E, Fisherman EK. Focal nodular hyperplasia: lesion evaluation using 16 MDCT and 3D CT angiography. AJR, 2006, 186: 1587-1596.
7Hussain SM, Terkivatan T, Zondervan PE, et al. Focal Nodular Hyperplasia: Findings at State-of-the-art MR Imaging, US, CT, and Pathologic Analysis. Radio Graphics, 2004, 24(1): 3-17.
8Hayashi M, Matsui O, Ueda K, et al. Progression to hypervas- cular hepatocellular carcinoma: Correlation with intranodular blood supply evaluated with CT during intraarterial injection of contrast material. Radiology, 2002, 225(1): 143-149.
9Leen E, Ceccotti P, Kal oger opoul ou C, et al. Prospective multicenter trial evaluating a novelmethod of characterizing focal liver lesions using contrast- enhanced sonography. AJR, 2006, 186 (6) : 1551-1559.
10CelliN, Gaiani S, Piscaglia F, et al. Characterization of liver lesions by real-time contrast-enhanced ultrasonography. Eur J Gastroenterol HepatoI, 2007, 19(1): 3-14.
