Transducers in medical ultrasound: Part Two. Vibration modes, matching layers and grating lobes |
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Authors: | N de Jong J Souquet G Faber N Bom |
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Institution: | Thoraxcenter, Erasmus University Rotterdam, PO Box 1738, 3000 DR, Rotterdam, The Netherlands;c/o Ultrasonics, 9 chaussée de Paris, 77102 Meaux, France;Laboratory for Technical Physics, Room D 209, University of Technology Delft, PO Box 5046, 2600 GA Delft, The Netherlands |
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Abstract: | The performance of transducers used for medical diagnosis depends to a great extent on matching layer, backing impedance and geometry of the active surface. In this paper special attention is given to the element vibrational modes, the optimum matching, the grating lobe and change of the real acoustic impedance into an imaginary impedance as a function of the product of the width and wavelength. Grating lobes on the echo image and the effect of a mismatch of the matching layer are illustrated. Suggestions are made for the design of linear and phased array transducers considering the above-mentioned aspects. |
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Keywords: | ultrasonics transducers vibration modes impedance matching |
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