Real time near field ultrasound imaging of soft tissues with linear phased arrays is subject to a variety of problems. These include 1) Image ambiguities which result from the finite sampling of the aperture and limiti. effective dynamic range; 2) Coherent speckle in the image; 3) The wavelength dependence of some reflectors. A substantial reduction in the effect of these problems on image quality may be achieved by the use of transducer arrays with wider bandwidths. Towards this end, a broadband linear array transducer was designed and constructed. This transducer overcomes the usual compromise between sensitivity and bandwidth typical of mechanically damped transducers, by using arrays of differing frequencies.
KeywordsSide Lobe Double Frequency Transducer Array Angular Response Diffraction Grating Lobe
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