In situ measurements of attenuation coefficient for evaluating the hardness of cataract lens by a high frequency ultrasonic needle transducer

Chih Chung Huang, Ruimin Chen, Po Hsiang Tsui, Qifa Zhou, Mark S. Humayun, K. Kirk Shung

研究成果: Conference contribution

摘要

A cataract is a clouding of the lens in the eye that affects vision. Phacoemulsification is the mostly common surgical method for treating cataracts, and determining the optimal phacoemulsification energy is dependent on measuring the hardness of the lens. This study explored the use of an ultrasound needle transducer for in situ minimally invasive measurements of ultrasound attenuation coefficient to evaluate the hardness of cataract lens. A 47 MHz high frequency needle transducer with a diameter of 0.9 mm was fabricated by a polarized PMN-33%PT single crystal in the present study. The attenuation coefficients at different stages of artificial porcine cataract lens were measured using the spectral shift approach. The hardness of the cataract lens was also evaluated by mechanical measurement of its elastic properties. The results demonstrated that the ultrasonic attenuation coefficient was increased from 0.048±0.02 to 0.520±0.06 dB/mm-MHz corresponding to an increase of Young's modulus from 6 to 96 kPa as the cataract further developed. In order to evaluate the feasibility of combining needle transducer and phacoemulsification probe for real time measurement during cataract surgery, the needle transducer was mounted on the phacoemulsification probe for vibration test. The results indicated that there was no apparent damage to the tip of needle transducer and the pulse-echo test showed a good performance in sensitivity was maintained after the vibration test.

原文English
主出版物標題2009 IEEE International Ultrasonics Symposium and Short Courses, IUS 2009
DOIs
出版狀態Published - 2009 十二月 1
事件2009 IEEE International Ultrasonics Symposium, IUS 2009 - Rome, Italy
持續時間: 2009 九月 202009 九月 23

出版系列

名字Proceedings - IEEE Ultrasonics Symposium
ISSN(列印)1051-0117

Other

Other2009 IEEE International Ultrasonics Symposium, IUS 2009
國家Italy
城市Rome
期間09-09-2009-09-23

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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  • 引用此

    Huang, C. C., Chen, R., Tsui, P. H., Zhou, Q., Humayun, M. S., & Shung, K. K. (2009). In situ measurements of attenuation coefficient for evaluating the hardness of cataract lens by a high frequency ultrasonic needle transducer. 於 2009 IEEE International Ultrasonics Symposium and Short Courses, IUS 2009 [5442033] (Proceedings - IEEE Ultrasonics Symposium). https://doi.org/10.1109/ULTSYM.2009.5442033