Principles Of Sonography Exam 2

Front 1

Acoustic Interface

Back 1

the boundary where sound waves hit the surface of the tissue

Front 2

Attenuation

Back 2

a decrease in intensity as beam travels through a medium. Acts to reduce the beam intensity of amplitude as the beam travels along its path. (units are dB)
-dependent on depth of penetration, frequency of beam, and attenuation coefficient.

Front 3

Power

Back 3

a measure of the total energy transmitted summed over the entire cross-sectional area of the beam per unit time (intensity multiplied by area). (Units are Watts or Joules/sec)

Front 4

Intensity

Back 4

physical parameter that describes the amount of energy flowing through a unit cross-sectional area of a beam each second. This is the rate at which the wave transmits the energy over a small area. (unit is the Watt per square cm or joule per second per square cm)

Front 5

Energy

Back 5

the ability of a system to do work

Front 6

Amplitude

Back 6

particle displacement, particle velocity, or acoustic pressure of a sound wave. Also indicates the strength of the detected echo or the voltage induced in a crystal by a pressure wave.

Front 7

Diffraction

Back 7

The spreading out of the beam that results from the beam passing through a small aperture.

Front 8

Decibel

Back 8

used to quantify a variety of processes; intensity, power, amplitude, dynamic range, attenuation.

Front 9

Depth of penetration

Back 9

attenuation is dependent on it. (measured in cm)

Front 10

Sensitivity

Back 10

the overall ability of the system to detect weak-reflecting objects at a specific distance from the transducer.