By Frederic L. Lizzi, D. Jackson Coleman, Jack Driller (auth.), A. J. Berkhout, J. Ridder, L. F. van der Wal (eds.)
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Extra resources for Acoustical Imaging
Acoustic resolution defines to what amount of detail vertical and lateral changes in a medium (position, shape, amplitude, velocities) can be derived from acoustic data. g. the two point diffractors in fig. 1b). By decreasing the duration of the acoustic pulse the vertical resolution is improved (pulse compression). This is accomplished by deconvolution. In figure 2a the influence of deconvolution is shown on the response of the two vertically displaced point diffractors of figure lb. Note the improvement in vertical resolution.
EIt Ata:1VD! ftlO! REa: I VD! 1 '5 . JOU Fig. 2C MS U3 Sphere L U3 Layer and sphere f4 f,;,I I~ f-- T f- 8 I - f- 1 - ~~- MS II 1- i ~~ Fig. " ~> Fig. :R - T c-- B ;- Fig. 2A 1"11""'011 a • ~ ~ ~> i Fig. ~. 5 Hz, Q1 = 180 Hz, Q 2 = 200 Hz. In order to correct for geometrical spreading, the amplitudes in the traces are multiplied by time. In Fig. 2c and 3c the Born-type of approximations (as discussed in Section 4) for the responses of the sphere are displayed. 6. DISCUSSION OF SYNTHETIC TRACES Since 2~ c 3 < 4R, the pulse of the source is sufficiently sharp to detect separate reflections from the top and the bottom of the sphere (see Fig.
Threshold Ultrasonic Dosage for Structural Changes in the Mammalian Brain," J. Acoust. Soc. , 48: 1413, 1970. Special Issue on Ultrasonic Hyperthermia, IEEE Trans. Sonics and Ultrasonics, L. Frizzell and S. ), SU-31, 1984. , Weininger, R. , "Vitreous Dispersion by Ultrasound," Ann. , 2:389-396, 1970. J. , "Experimental Cataract Productions by High Frequency Ult rasound," Ann. Ophthalmo 1. , 10:934-942, 1978. 15 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. A. , "Experimental, Ultrasonically Induced Lesions in the Retina, Choroid and Sclera," Invest.