Physics Basic
Term for number of events occurring in a given time.
frequency
Transducer that has a single element which constantly emits a sound beam.
What is a Continuous Wave transducer?
As area of beam decreases and power remains constant, this increases.
What is intensity?
Type of artifact that occurs as a result of a strongly attenuating structure
What is shadowing?
Reciprocal of pulse repetition frequency
What is pulse repetition period?
Pressure, density, distance
What are acoustic variable?
Part of the transducer housing that is 1/4 the thickness of the wavelength of that part of the transducer.
What is the matching layer?
Units of power
What is Watts or milliwatts.
An artifact that assists in identifying a simple cyst
What is posterior enhancement (through transmission)?
Time it takes for one pulse to occur
What is pulse duration?
Interference of a pair of out-of-phase waves results in this.
What is destructive interference?
Material commonly used in clinical transducers that convert sound into electricity.
What is lead zirconate titanate(PZT)?
What is piezoelectric (ferroelectric)?
This happens if the amplitude of a wave increases by a factor of two.
What is intensity is quadrupled?
Artifact than can be produced by imaging too deeply for the particular PRF being used in imaging
What is range ambiguity?
Number of cycles in a pulse multiplied by wavelength
What is spatial pulse length?
A type of energy that doesn't travel in a vacuum.
What is acoustic (sonic) energy?
Temperature at which PZT is polarized
What is the Curie temperature or Curie point?
Unit(s) of attenuation coefficient
What is dB/cm?
Artifact similar to that witnessed in the appearance of a wagon wheel "rolling backwards" as it moves forward.
What is aliasing?
Fraction of time that pulse is actually on
What is duty factor?
A descriptive term for the "bigness" of a wave.
What is amplitude?
What is power?
What is intensity?
Decreases the Q-factor in a transducer
What is damping material?
Frequency is doubled and path length is halved, attenuation is ....
What is unchanged?
Artifact that can falsely produce two gestational sacs when only one exists
Refraction artifact
PRP limits this in sonographic imaging.
What is depth?