H - Electricity – 04 – R
Patent
H - Electricity
04
R
349/36, 349/65
H04R 17/00 (2006.01) A61B 8/00 (2006.01) B06B 1/06 (2006.01) H01L 41/24 (2006.01)
Patent
CA 1206588
ABSTRACT: "Apodized ultrasound transducer". An ultrasound transducer for medical pulse echo applications is apodized by causing the level of response to vary as a function of position on the transducer aper- ture. In a preferred embodiment the response varies as a Gaussian function of distance from the center or center line of the transducer so that the response at the edge of the transducer is approximately 30% of the response at the center or center line. The response may be varied by causing the polarization of a piezoelectric ceramic trans- ducer to decrease as a function of distance from the acous- tic axis. This is achieved in that the transducer comprises a matrix of parallel rods (80) of piezoelectric ceramic in an inert binder (82), The polarization, the composition, the cross-section or the spacing of the rods may vary as a function of distance (X) from the center (C) of the transducer.
436737
North American Philips Corporation
Van Steinburg C.e.
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