By F. Dunn (auth.), Prof. Dr. R. Millner, Dr. E. Rosenfeld, Dr. U. Cobet (eds.)
Due to the ever expanding curiosity within the use of non-invasive ultrasonic tools in clinical diagnostics at the one hand and the explicit results of ultrasound in clinical remedy at the different, the issues of safety and optimum functions are topical and of significant significance. for that reason the symposium "Ultrasound interplay in Biology and Medicine," initiated and supported by means of the "International association of clinical Physics," came about. The organizers have been the Institute of utilized Biophysics of the Martin-Luther-University, Halle (Saale), German Democratic Republic, in organization with the Society for actual and Mathematical Biology of the GDR in addition to different medical organisations. popular and across the world famous experts within the box of ultrasonics mentioned at the most up-to-date findings in regards to the organic interplay of ultrasound, which promised destiny advancements within the equipment of ultrasonic diagnostics and gave and updated perception into the organic effectiveness of ultrasound. we're happy with a view to submit chosen contributions to this symposium gathered in a single quantity. The tools of research, theoretical issues and effects in regards to the interplay of ultrasound on molecular, mobile and procedure degrees contained herein will stay updated for a very long time to come back, supplying suggestion upsetting fabric for extra inter-disciplinary simple examine and clinical application.
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73-77. NUMERICAL CALCULATION OF NEARFIELD PRESSURE VARIATIONS OF DIFFERENT ANNULAR RING TRANSDUCERS B. -P. Richter and R. Millner Institute of Applied Biophysics Martin-Luther-University DDR-404l Halle, Strasse der DSF 81, GDR INTRODUCTION The medical ultrasonic diagnosis calls for ultrason~c transducers with a better spatial resolution. Computer modeling of the soundfields was a useful help in transducer design. The computations of soundfields was based on the RAYLEIGH-integral(l). Due to the solution method of this integral, the nearfie1d of FRESNEL-zone and the farfie1d or FRAUNHOFER-zone must be distinguished.
But this is always connected with a higher degree of effort to produce such transducers. Furthermore, the model calculations indicate that the sensitivity of cw-Doppler transducers can be improved by using an asymmetric construction, that means a separate optimum transmitting and receiving system. REFERENCES 1. 2. w. P. Mason, "Physical Acoustics", Academic Press, New York, San Francisco, London (1964), Volume 1, Part 1. G. Kossoff, D. E. Robinson and W. J. Garrett, The Cal Abdominal Echoscope, in: "Commonwealth Acoustic Laboratories Report No.
5. 6. 7. 8. 9. function generator frequency counter oscilloscope snap-on ammeter transducer ou ter vessel inner vessel absorbing target shielding membrane 10. ll. 12. 13. 14. 15. 16. 17. 18. hanging wire balance support microbalance balance control unit d/a converter x-t pen-recorder computer interface computer teletype 26 F. HOLZER AND P. WACH REFERENCES 1. 2. 3. 4. H. Rund, "The Hamilton-Jacobi Theory and the Calculus of Variations", Van Nostrand, London (1966). P. Wach, F. Holzer, N. Leitgeb and S.