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http://dx.doi.org/10.7776/ASK.2010.29.8.476

Influences of the Defective Piezo-Elements of a Medical Ultrasonic Probe on Transient Acoustic Fields and B-Mode Images  

Choi, Kwang-Yoon (부경대학교 대학원 음향진동공학과(협))
Ha, Kang-Lyeol (부경대학교 물리학과)
Kim, Moo-Joon (부경대학교 물리학과)
Kim, Jung-Soon (동명대학교 멀티미디어공학과)
Yang, Jeong-Hwa (제주한라대학 방사선과)
Kang, Gwan-Suk (제주대학교 의학과 의공학협동과정)
Choi, Min-Joo (제주대학교 의학과 의공학협동과정)
Publication Information
The Journal of the Acoustical Society of Korea / v.29, no.8, 2010 , pp. 476-482 More about this Journal
Abstract
The ultrasonic transient fields and B-mode images of a point target which were simulated for a medical ultrasonic probe with a few defective piezo-elements were compared with those for a normal probe. The present study considered a 3.5 MHz linear array probe whose acoustic beam was formed by the 64 active elements of total 192 elements. The results showed that the maximum amplitude and -3 dB width of the acoustic fields by main-lobes decreased linearly as the defective element number increased from one to four. However, the depths of foci remained almost unchanged, and the pressure differences between main-lobes and side-lobes tended to decrease due to rise in pressures in side-lobes. Such changes in ultrasonic fields affected the B-mode images of point targets. So the artifacts were formed in the right and left side of the target, and the lateral spatial resolutions were decreased while the axial resolution was almost the same.
Keywords
Ultrasonic Imaging; Medical Ultrasound Probe; Defective Element; Transient Acoustic Field; Spatial Resolution;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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