Use appropriate duplex instrumentation with appropriate frequencies for the vessels being examined:

• Typically, this is a linear 5-7 MHz transducer
  • Superficial structures may require a higher frequency transducer
  • Deeper structures or edematous tissue may require a lower frequency transducer
• Display of two-dimensional structures and motion in real-time
  • Doppler ultrasonic signal documentation
  • Spectral analysis with color and/or power Doppler imaging
• Digital storage capabilities of ultrasound images