1Shpiro RS, Wagreich J, Parsons RS, et al. Tissue harmonic imaging sonography:evaluation of image quality compared with conventional sonography[J] .Am J Roentgenol, 1998,171 : 1203.
2Kim B, Lim HK, Choi MH, et al. Detection of parenchymal abnormalities by pulse inversion harmonic imaging with or without microbubble uhrasonographic contrast agent: correlation with conputed tomography[J]. Ultrasound Med, 2001,20 : 5.
3Becher H, Tiemann K,Schlosser T, et al. Improverment in endocardial border delineation using tissue harmonic imaging [J]. Echoeardoigraaphy. 1998,15 : 511.
5Tanaka S,Oschikawa O, Sasaki T, et al. Evaluation of tissue harmonic imaging for the diagnosis of focal liver lesions[J]. Uhrasond Med Biol, 2000,26 : 183.
6Hong HS, Han JK, Kim TK, et al. ultrassonographie evaluation of the gallbladder: comparison of fundamental, tissue harmonic and pulse inversion harmonic imaging [ J ] . Uhrasond Med, 2001,20 :35.