Ultrasound Physics: TEST 1 REVIEW Exam
Questions And Answers 100% Pass.
Velocity in relationship to frequency & wavelength - answer✔**Speed = frequency x wavelength**
4 diff types of attenuation - answer✔3 components:
1. Reflection
2. Scattering
3. Absorption
4. Refraction
What's energy per unit area of sound called? - answer✔**Intensity = Power(w) / area (cm2)**
What is peak pressure or height of a wave known as? - answer✔Amplitude
A. How long does it take a beam of sound to make a trip in 1 cm of soft tissue?
B If it Changes to 1 from skin surface to reflector 20 cm deep, how long does it take that sound to make
a round trip? - answer✔A. 13 microseconds (us)
B. 20 x 13 = 260 microseconds
SPTA means? - answer✔Spacial Peak Temporal Average
What has the highest sound velocity? - answer✔Intensities from Largest to smallest:
SPTP -> Im -> SPPA -> SPTA -> SATA
Temporal Intensities from Largest to smallest:
Itp -> Imax -> Ipa -> Ita
Definition of spatial pulse length? - answer✔Distance that a pulse occupies in space from the start to the
end of a pulse.
Units: mm
Determined by: BOTH Source & Medium
NOT adjustable
**SPL= # cycles x wavelength**
Directly proportional to number of cycles in the pulse
Directly proportional to wavelength
Inversely proportional to Frequency
Frequencies that are not in the ultrasound range? - answer✔audible sound: between 20 Hz and 20kHz
infrasound: less than 20 Hz
Velocity, which has least, greatest, put in increasing order. - answer✔TEMPORAL INTENSITIES FROM
LARGEST TO SMALLEST: Itp, Imax, Ipa, Ita
Definition of propagation speed? - answer✔Rate at which the sound rate travels through a medium
Units: m/sec, mm/us, or any distance divided by time
Determined by: Medium
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