Introduction to Ultrasound PDF
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Assiut University
Dr. Wagih G. Girgis
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Summary
This document presents an introduction to ultrasound. It covers topics such as the physical properties of ultrasound, its propagation through different mediums (like air, water and solids), its application in medical imaging, and the attenuation of the ultrasound wave as it propagates through tissue. It includes detailed explanations and equations related to the concepts.
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Introduction to Ultrasound Prepared By Dr. Wagih G. Girgis Lecture Component A ؤ Sound can propagate through a medium such as air, water and solids as longitudinal waves and also as a transverse wave in solids. Ultrasound can propagate through a medium such as...
Introduction to Ultrasound Prepared By Dr. Wagih G. Girgis Lecture Component A ؤ Sound can propagate through a medium such as air, water and solids as longitudinal waves and also as a transverse wave in solids. Ultrasound can propagate through a medium such as air, water and solids as longitudinal waves Longitudinal plane wave Is the RMS sound is the RMS sound pressure Attenuation of the ultrasound beam as it propagates through tissue is the sum of absorption and scattering from small structures. Attenuation is characterized by an exponential decrease in both the pressure and intensity of the ultrasound beam as a function of its propagation distance, z, through tissue: where µ is the intensity attenuation coefficient and α is the pressure attenuation coefficient, both measured in units of cm-1. The value of µ is equal to twice that of α. The value of µ is often stated in units of decibels (dB) per cm, where the conversion factor between the two units is given by: The END
