1[3]Medwin H. Counting bubbles acoustically: a review. Utrasonics 1997,15: 7 - 13
2[4]Bums PN, Powers JE, Fritzsch T. Harmonic imaging: a new imaging and Doppler method for contrast enhanced ultrasound. Radiology 1992,185(p): 142
3[5]de Jong N, Comet R, Lancee CT. Higher harmonics of vibrating gas filled microspheres. Part two: Measurements. Ultrasonics 1994, 32:455 - 9
4[6]Villarage H, Foley D,Aeschbacher B, et al. Destruction of contrast microbubbles during ultrasound imaging at conventional power output. J Am Soc Echocardiogr 1997,10:783- 91
5[7]de Jong N, Bouakaz A, Frinking PJ,et al. Contrast- specific imaging methods. In: Goldberg BB, Raichlen JS, Forsberg F. Ultrasound Contrast Agents: Basicprinciples and clinical applications. 2nd ed. London: Martin Dunitz. 2001: 34
6[8]Chomas JE, Dayton PA, Allen J, et al. Optical and acoustical observation of contrast - agent destruction. In: Goldberg BB, Raichlen JS,Forsberg F. Ultrasound Contrast Agents: Basic principles and clinical applications. 2nd ed. London: Martin Dunitz. 2001:63 - 66
7[9]Brock - Fisher G, Poland M, Rafter P, et al. Experimental observations of the sensitivity and frequency response of the power modulation technique for contrast imaging. In: Proceedings of Fifth Heart Centre European Symposium on Ultrasound Contrast Imaging. Rotterdam, 2000:1 - 77
8[10]Mattrey RF, Steinbach G, Lee Y, et al. High - resolution harmonic gray - scale imaging of normal and abnormal vessels and tissues in animals. Acad Radiol, 1998,5 (Supple 1): S 63 - 5
9[11]Simpson HD, Chin CT, Burns PN. Pulse inversion Doppler: a new method for detecting nonlinear echoes from microbubble contrast agents. IEEE Trans Ultrason Ferroelec Freq Contr 1999,46: 372- 82
10[12]Haider B, Chiao RY. High order nonlinear ultrasonic imaging. 1999 IEEE International Ultrasonics Symposium. Oct. 17 - 20, 1999. pp.1527- 1531
3Roux E,Stomp R,Giasson S,et al. Steric stabilization of liposomes by pH-responsive N-isopropylacrylamide copolymer. J Pharm Sci, 2002,91 : 1795-1802.
4[3]Ophir J, Cespedes EI, Ponnekanti H, et al. Elastograpy: A quantitative method for imaging the elasticity of biological tissues. Ultrason Imaging, 1991,13: 111-134
5[4]Kallel F, Ophir J, Magee K, et al. Elastographic imaging of low-contrast elastic modulus distributions in tissue. Ultrasound in Med Biol, 1998,24:409-425
6[5]Righetti R, Ophir J, Ktonas P. Axial resolution in elastography.Ultrasound in M ed Biol., 2002,28 (1): 101-113
7[6]Kallel F,Ophir J. Limits on the contrast of strain concentrations in elastography. ibid., 1998,24: 1215-1219
8[7]Alam K,Ophir J, Konofagou EE. An adaptive strain estimator for elastography. IEEE Trans Ultrason Ferroelect Freg Contr. 1998,45: 461-472
9[8]Shiina T,Yamakawa M,Nitta N,et al. Recent progress of ultrasound elasticity imaging technology. Seven Congress of the Asian Federation of Societies for Ultrasound in Medicine and Biology (Abstract). Utsunomiya, Toc higi, Japan ( May, 2004): 198
