Sound
particles stretched apart (below baseline)
What is Rarefaction?
particles move perpendicular to the direction the wave is moving (moving at a 90-degree angle, moving up and down but moving forward)
What are transverse Waves?
7 Parameters
What is Period
Frequency
Amplitude
Power
Intensity
Wavelength
Speed
events per interval of time or how often something happens
What is frequency?
the bigness of the wave. It is the difference between the maximum and minimum values compared to the average
What is amplitude?
particles are squeezed together (above baseline)
What is Compression?
particles move parallel to the direction the wave is moving
What is Longitudinal Wave?
T (think of it as time)
What is period?
Unit of frequency
What is hertz?
Pressure (pascals), density (g/cm^3), particle motion (mm), and decibels
What is units?
effects of the medium on the sound wave (ex: what does the body do to the sound wave
What are acoustic propagation properties?
waves where the peaks and troughs align (peaks occur at the same time and at the same location
What are In Phase Waves?
Formula
What is T = 1/f?
Typical US value
What is 2 MHz to 15 MHz?
Typical US value: 1 MPa to 3 MPa
What is 1 MPa to 3 MPa
effect of the sound wave on the body (ex: what does the sound do to the body)
What are Biologic effects?
when sound waves occur in the same location, they interfere with each other—can be in phase or out of phase
What is interference?
typical US value for period
What is 0.06 us to 0.5 us?
Formula for frequency
What is f = 1/T
measured from baseline to
What is peak/trough
One sound wave or cycle has 2 parts: Compression and rarefaction
What is how does sound travel through a medium?
waves that do not align (peaks occur at different times, they are out of step)
What is Out of Phase Waves?
Unit of period
What is Microseconds (us)
cannot technically be changes by the sonographer, unless choosing different probes with set frequencies)
Frequency Adjustable? NO
Amplitude is Determined by
What is Source? (weakens as it travels)