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Diagnostic ultrasonography is a cross-sectional imaging technique based on the physical principles of sound waves. Unlike electromagnetic waves, which can be transmitted within a vacuum, sound waves need a medium (liquid, solid or gas) for propagation. The particles of the medium are oscillated by a sound wave due to alternating pressure deviations from the equilibrium pressure, causing local regions of compression and rarefaction. This chapter explains the production of ultrasound waves and their interaction with tissues to produce the ultrasound image, together with Doppler and harmonic ultrasonography.
Physical principles, Page 1 of 1
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