Matching layer optimization between ultrasound transducer and human tissues

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Original languageEnglish
Pages (from-to)623-624
Journal / PublicationAnnual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - Proceedings
Issue number1
Publication statusPublished - 1995
Externally publishedYes


TitleProceedings of the 1995 IEEE Engineering in Medicine and Biology 17th Annual Conference and 21st Canadian Medical and Biological Engineering Conference. Part 2 (of 2)
CityMontreal, Can
Period20 - 23 September 1995


Several volume rendering methods have been developed for CT, MRI and PET in recent years, however, very limited research has been undertaken successfully with the applications in volume rendering of ultrasound images. One of the major problems is in overcoming severe noise contamination in conventional 2D real time ultrasound images. We have studied a method to improve the transmission of ultrasound waves to human body. It is found that a Solid Gel matching layer with thickness in multiple quarters of a wavelength and an matching impedance between the ultrasound transducer surface and body surface could maximize the transmitted ultrasound pulse amplitude into the body. Theoretical analysis indicates that for the matching layer the thickness should be a multiples of 0.036mm to 0.11mm depending on transducer used (conventional frequency range from 3.5 MHz to 10 Mhz). The impedance of the matching layer should be correspondingly 158*106 Kg/m2Sec to 30*106 Kg/m2Sec. In order to confirm the theoretical prediction, we performed computer simulations and experiments using a type of Solid Silica Gel with a thickness of 33mm and impedance of 6.90*106 Kg/m2Sec for a 3.5 Mhz ultrasound convex transducer.

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