Quick Reference:

  • Period x Frequency = 1
  • Intensity (W/cm2) = Power (w) / Area (cm2)
  • Wavelength (mm) = Propagation Speed / Frequency (MHz)
  • Propagation Speed (m/s) = Frequency (Hz) x wavelength (m)
  • Pulse Duration (us) = # cycles X period (us)
  • Pulse Duration (us) = # cycles / Frequency (MHz)
  • Spatial Pulse Length SPL (mm) = # cycles X Wavelength (mm)
  • PRP = 1 / PRF
  • PRF = 1 / PRP
  • PRF x PRP = 1
  • Duty Factor (%) = Pulse Duration / Pulse Repetition period X 100
  • Total Attenuation (dB) = Attenuation Coefficient (dB/cm) X Distance
  • Attenuation Coefficient (dB/cm) = Frequency (MHz)/2
  • Attenuation Coefficient (dB/cm)  = 0.5dB / cm / MHz
  • PRP = imaging depth (cm) X 13 microseconds / cm
  • PRF (Hz) = 77,000 cm / s / imaging depth (cm)
  • Axial resolution (mm) = SPL (mm) / 2
  • Axial resolution (mm) = (wavelength (mm) X # cycles in pulse) / 2
  • Axial resolution (mm) = 0.77 x #cycles in pulse / Frequency (MHz)
  • Near Zone Length (mm) = Diameter (squared) (mm) / 4 x wavelength (mm)

by Franco Vallejos

 

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I am the founder and lead Instructor here at ExamRefresh.com. I strive to help those that are entering the field of Ultrasound to be the best that they can be. Ultrasound is my passion.

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Comments

  1. alvarezdiana1 says:

    Hello there, thank you for your videos, they have been helping my classmates and I very much. We will be taking the SPI on August 7. We are all very nervous about this test. Keep up the great work :)

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