Foundations of clinical sonography With 100% verified answers Graded A+ Sonography imaging technique to visualize what? - Soft tissue Echo - Cardiac structures Doppler Technique - Allows qualitative and quantitative evaluation of blood flow hemodynamics w/n a vessel Lazzaro Spallanzani - Discovered echolocation Curie brothers - discovered piezoelectricity 20 hertz & 20kHz - Most human hearing range 20kHz - Ultrasound frequencies greater than Sound - Mechanical energy >compression rarefaction as it travels as a wave Energy - Moves back and forth or vibrates Soft tissue - Average propagation velocity of 1540m/sec Frequencies or wavelength - Velocity of propa gation is not affected by Stiffness & density - What are the two characteristics of a medium that affect the speed of sound? Closer packed muscle - Faster speed of sound What does decibel measure of an ultrasound wave? - Intensity, strength, amplitude & power
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