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DOPPLER INDICES |
- Systolic/Diastolic Ratio (S/D )
- Approaches infinity as diastolic velocity approaches 0.
- Pourcelet or Resistance Index (RI) = S-D/S
- Pulsatility Index = S-D/Mean
- Measurement requires digitizing the entire waveform.
- Correlation between indices are high.
- Operator related variation <10%.
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SD Ratio =S/D |
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RI=(S-D)/S PI=(S-D)/Mean |
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