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Sensors 2017, 17(1), 107; doi:10.3390/s17010107

Quantitative Assessment of First Annular Pulley and Adjacent Tissues Using High-Frequency Ultrasound

1
Department of Computer Science and Information Engineering & Institute of Medical Informatics, National Cheng Kung University, No. 1, University Road, Tainan City 70101, Taiwan
2
Department of Biomedical Engineering, National Cheng Kung University, No. 1, University Road, Tainan City 70101, Taiwan
3
Medical Device Innovation Center, National Cheng Kung University, No. 1, University Road, Tainan City 70101, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editors: Dipen N. Sinha and Cristian Pantea
Received: 10 October 2016 / Revised: 3 January 2017 / Accepted: 5 January 2017 / Published: 7 January 2017
(This article belongs to the Special Issue Ultrasonic Sensors)
View Full-Text   |   Download PDF [6471 KB, uploaded 7 January 2017]   |  

Abstract

Due to a lack of appropriate image resolution, most ultrasound scanners are unable to sensitively discern the pulley tissues. To extensively investigate the properties of the A1 pulley system and the surrounding tissues for assessing trigger finger, a 30 MHz ultrasound system was implemented to perform in vitro experiments using the hypodermis, A1 pulley, and superficial digital flexor tendon (SDFT) dissected from cadavers. Ultrasound signals were acquired from both the transverse and sagittal planes of each tissue sample. The quantitative ultrasonic parameters, including sound speed, attenuation coefficient, integrated backscatter (IB) and Nakagami parameter (m), were subsequently estimated to characterize the tissue properties. The results demonstrated that the acquired ultrasound images have high resolution and are able to sufficiently differentiate the variations of tissue textures. Moreover, the attenuation slope of the hypodermis is larger than those of the A1 pulley and SDFT. The IB of A1 pulley is about the same as that of the hypodermis, and is very different from SDFT. The m parameter of the A1 pulley is also very different from those of hypodermis and SDFT. This study demonstrated that high-frequency ultrasound images in conjunction with ultrasonic parameters are capable of characterizing the A1 pulley system and surrounding tissues. View Full-Text
Keywords: pulley; attenuation coefficient; sound speed; integrated backscatter; Nakagami parameter pulley; attenuation coefficient; sound speed; integrated backscatter; Nakagami parameter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lin, Y.-H.; Yang, T.-H.; Wang, S.-H.; Su, F.-C. Quantitative Assessment of First Annular Pulley and Adjacent Tissues Using High-Frequency Ultrasound. Sensors 2017, 17, 107.

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