INFORMATICA International Journal Main Page Editorial Board Abstracting/Indexing Instructions to Authors Subscription Information Contents Author Index Papers in Production		INFORMATICA, 2003, Vol. 14, No. 4, 529-540 © Institute of Mathematics and Informatics, ISSN 0868-4952 Evaluation of Ultrasound Attenuation Characteristics of Human Cataract Alvydas PAUNKSNISa, Skaidra KURAPKIENEa, Audris MACIULISb, Marija-Liucija PAUNKSNIENEc aDepartment of Ophthalmology, Institute for Biomedical Research Kaunas University of Medicine Eiveniu 4, LT-3007, Kaunas, Lithuania E-mail: apaun@medi.lt bDepartment of Applied Electronics, Kaunas University of Technology Student 50-302, LT-3031, Kaunas, Lithuania E-mail: maciul@ktu.lt cDepartment of Anatomy and Histology, Lithuanian Veterinary Academy E-mail: oftalmolog@lva.lt. Abstract Cataract is very frequent disease of human eye and the diagnosis of this disease is not difficult. However, it is important to describe it quantitatively, but it is difficult using only the slit lamp. Ultrasound examinations are widely used in ophthalmology. Piezoelectric crystals generate ultrasound waves of 5-50 MHz. Short pulses of 2 to 3 cycles are sent from transducer into the eye. These pulses go through the tissues of the eye with the speed that is inversely proportional to the density and elasticity of the eye. Acoustic parameters of biologic tissues are described by velocity and attenuation coefficient. It is known that in soft tissues the attenuation coefficient is approximately proportional to the frequency - high frequency components of echoes are attenuated more than the lower frequency components. Results of ultrasound attenuation characteristics of human nuclear cataract are presented. It was shown that ultrasound attenuation of nuclear cataract could be used as ``second opinion'' for physicians decision support. Keywords: ultrasound attenuation, nuclear and diabetic cataract, acoustic parameters, digital signal processing To preview Lithuanian abstract see full article text To preview full article text in PDF format click here You could obtain free Acrobat Reader from Adobe
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