535B - Echocardiography Questions & Answers Update

535B - Echocardiography Questions & Answers Update
Diminishes with distance from the sound source - ANS-Amplitude
Does the frequency change with distance from the sound source? - ANS-no
What increases the amplification of reflected signals that have traveled further in the tissue? - ANS-Time
gain compensation (TGC)
The amplitude is a measure of - ANS-tissue compression
D = - ANS-V x T/2
When the Time (T) required for the sound wave to travel from the transducer to the object and back is
combined with the speed of sound (V) in a particular medium, the distance (distance = V x T/2) of the
object from the transducer can be precisely determined
The sound waves are then transmitted into the surrounding medium at a rate commensurate with -
ANS-the speed of sound in that medium
Refers to deflection of the ultrasound beam as it travels from one tissue type to another - ANSrefraction
Occurs when an ultrasound wave strikes a structure that is less than 1 wavelength in lateral dimenstion -
ANS-scattering
Represents the amount of ultrasound energy that dissipates as heat - ANS-absorption