中国物理B ›› 2005, Vol. 14 ›› Issue (8): 1594-1599.doi: 10.1088/1009-1963/14/8/022

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Nonlinear propagation of focused ultrasound in layered biological tissues based on angular spectrum approach

朱晓峰, 周琳, 章东, 龚秀芬   

  1. State Key Laboratory of Modern Acoustics, Institute of Acoustics,Nanjing University, Nanjing 210093, China
  • 收稿日期:2004-12-14 修回日期:2005-01-14 出版日期:2005-07-13 发布日期:2005-07-13
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10204014).

Nonlinear propagation of focused ultrasound in layered biological tissues based on angular spectrum approach

Zhu Xiao-Feng (朱晓峰), Zhou Lin (周琳), Zhang Dong (章东), Gong Xiu-Fen (龚秀芬)   

  1. State Key Laboratory of Modern Acoustics, Institute of Acoustics,Nanjing University, Nanjing 210093, China
  • Received:2004-12-14 Revised:2005-01-14 Online:2005-07-13 Published:2005-07-13
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10204014).

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摘要： Nonlinear propagation of focused ultrasound in layered biological tissues is theoretically studied by using the angular spectrum approach (ASA), in which an acoustic wave is decomposed into its angular spectrum, and the distribution of nonlinear acoustic fields is calculated in arbitrary planes normal to the acoustic axis. Several biological tissues are used as specimens inserted into the focusing region illuminated by a focused piston source. The second harmonic components within or beyond the biological specimens are numerically calculated. Validity of the theoretical model is examined by measurements. This approach employing the fast Fourier transformation gives a clear visualization of the focused ultrasound, which is helpful for nonlinear ultrasonic imaging.

Abstract: Nonlinear propagation of focused ultrasound in layered biological tissues is theoretically studied by using the angular spectrum approach (ASA), in which an acoustic wave is decomposed into its angular spectrum, and the distribution of nonlinear acoustic fields is calculated in arbitrary planes normal to the acoustic axis. Several biological tissues are used as specimens inserted into the focusing region illuminated by a focused piston source. The second harmonic components within or beyond the biological specimens are numerically calculated. Validity of the theoretical model is examined by measurements. This approach employing the fast Fourier transformation gives a clear visualization of the focused ultrasound, which is helpful for nonlinear ultrasonic imaging.

Key words: Focused ultrasound, second harmonic imaging, angular spectrum approach

中图分类号:  (Biological effects of acoustic and ultrasonic energy)

  • 87.50.Y-
43.80.Cs (Acoustical characteristics of biological media: molecular species, cellular level tissues) 43.25.-x (Nonlinear acoustics) 43.35.-c (Ultrasonics, quantum acoustics, and physical effects of sound)