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Wave Generation and Its Effect on Lesion Detection in Sonoelastography: Theory and Simulation Study  

박정만 (대진대학교 물리학과)
권성재 (대진대학교 통신공학과)
정목근 (대진대학교 전자공학과)
Publication Information
The Journal of the Acoustical Society of Korea / v.24, no.5, 2005 , pp. 282-293 More about this Journal
Abstract
Sonoelastography is an ultrasound-based technique that visualizes the elastic properties of soft tissues by measuring the tissue motion generated by an externally applied vibration. In this paper. the characteristics of wave generation in soft tissues due to an acoustic vibrator are studied. The effects of modal patterns on the detectability of lesions such as tumors in senoelastography are also investigated These are accomplished by analyzing the vibration patterns calculated using theoretical equations and finite element methods in halt space, infinite plate. and finite-sized tissue. A finite-width source generates shear waves with large amplitude Propagating in specific directions. and the generation characteristics depend both on the width and frequency of the vibrator. as well as the distance from it. It is shown in a finite-sized tissue that the lesion detection in displacement images is quit dependent on the modal patterns inside tissue. In contrast it Is also found that the lesion detectability in strain images is less dependent on the modal Patterns and is much better than that in displacement images.
Keywords
Ultrasonic imaging; Soft tissue; Sonoelastography; Vibrational amplitude; Strain;
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