UW-Madison MEDPHYS 666 - The Silent Revolution - Catching Up With the Contemporary Composite Transducer (11 pages)

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The Silent Revolution - Catching Up With the Contemporary Composite Transducer



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The Silent Revolution - Catching Up With the Contemporary Composite Transducer

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Pages:
11
School:
University of Wisconsin, Madison
Course:
Medphys 666 - Rad Lab - Medical Ultrasound Physics

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JDMS 20 395 405 November December 2004 395 ARTICLE 10 1177 8756479304269943 JOURNAL OF DIAGNOSTIC MEDICAL SONOGRAPHY November December 2004 VOL 20 NO 6 THE SILENT REVOLUTION Powis Moore JDMS 20 395 405 November December 2004 The Silent Revolution JDMS 20 395 405 November December 2004 Catching Up With the Contemporary Composite Transducer RAYMOND L POWIS PHD FAIUM G WAYNE MOORE BSC MA In accordance with ACCME Standards authors are required to disclose any commercial affiliations or financial interests that might be perceived as a real or apparent conflict of interest related to the content of their JDMS CME article The author Dr Raymond Powis is a consultant to Sonora Medical Systems Although a remarkable signal processing evolution has been going on in the sonograph a more silent revolution has been going on within the scanhead with the development of composite multielement transducers CMETs This article examines the current state of CMET development and explores what these changes mean to basic beam formation and focusing The discussion reveals some of the technologies that are part of contemporary CMET design including transducer poling connectivity and coupling In addition this discussion includes some quality assurance QA techniques that can test these new transducers for proper function and determine what is happening beneath the scanhead housing Finally the authors propose a list of measurements needed to test CMETs including element sensitivity element center operating frequency element fractional bandwidth pulse shape pulse duration and element and cable capacitance and they provide a QA testing protocol for the CMET Key words ultrasound transducer multielement composite quality assurance poling connectivity coupling beam forming beam steering From Greeley Colorado and Sonora Medical Systems Longmont Colorado Correspondence Raymond L Powis Ultrasound Consultant 1203 43rd Avenue Greeley CO 80634 E mail rlpowis mindspring com DOI 10 1177 8756479304269943 The



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