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Doppler Parameters Summary for Trained Users

Helpful guide for trained users in adjusting Doppler settings, interpreting flow patterns, and analyzing various blood vessels with tips on compensating aliasing and optimizing color scales.

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Doppler Parameters Summary for Trained Users

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  1. SUMMARY OF DOPPLERPARAMETERS SUMMARY OF DOPPLERPARAMETERS N.B.THIS SUMMARY IS HELPFUL FOR WHO's ALLREADY TRAINED TO USEDOPPLER • Main Types offlow: -Arterial -Venous • SETTING: Don't forget toadjust • Mode of scan “Arterial , Venous , Abd. , scrotal…..etc” • Probe : Curved Deep / Linear Superficial • ColorGain • Angle = < 60 (Not 90 , as Cos 90 = 0 No Dopplersignal" • “Gate” Sample Volume “ = “ at middle part ofVessel • PRF “ : Decrease detect lower velocities“ ALIASING = Signal disturbed Non Homogenous colorflow How to CompensateAliasing? by: o Increase PRF“Pulse Repeated Frequency” / If use max PRF, then: • DecreaseDepth • Shift baseline • LowerFrequency • Increase Angle“with inlimits” COLOR VELOCITY SCALE : Increase it = adjust setting to detect higher velocities ,so Ex. By A.M.Abodahab – Ass.Lecturer of radiology SohagUniversity

  2. SUMMARY OF DOPPLERPARAMETERS Directions of Scan: o At least 2directions Vertical &Horizontal +/-Oblique PATTERNS OF FLOW TERMS: By A.M.Abodahab – Ass.Lecturer of radiology SohagUniversity

  3. SUMMARY OF DOPPLERPARAMETERS PARAMETERS UMBLICALARTERY NormalPattern SAW TOOTH"Biphasic" UMBLICALVEIN • Normally Continuous non fluctuationflow • Pulsating flow occurs in Placental insufficiency + arterial flowchanges By A.M.Abodahab – Ass.Lecturer of radiology SohagUniversity

  4. SUMMARY OF DOPPLERPARAMETERS • MCA Middle Cerebral A.: • Can use ANGLE= 0 / * COS 0 = 1 Best Dopplersignal • IN Placental insufficiency less blood reachbrain • MCAvasodilatation Decrease resistance. “Brain sparingeffect” ’Brain sparing‘ MCA - lower peak, much higher diastolic velocity suggestscerebro-vasodilation MCA SDRatio KEEPINMINDNormal SDRATIO of MCA > always higher than > Umbilical A. UA By A.M.Abodahab – Ass.Lecturer of radiology SohagUniversity

  5. SUMMARY OF DOPPLERPARAMETERS CAROTID As.: HEPATIC A & PORTAL V.: BOTH HEPATIC A. & PORTAL V. FLOW DIRECTION TOWARDLIVER HEPATICV PV PEAKVELOCITY 20 : 33 CM /SEC By A.M.Abodahab – Ass.Lecturer of radiology SohagUniversity

  6. SUMMARY OF DOPPLERPARAMETERS RENAL A: UPPER LIMB AS.: LOWER LIMB AS.: By A.M.Abodahab – Ass.Lecturer of radiology SohagUniversity

  7. SUMMARY OF DOPPLERPARAMETERS TESTICULAR AS.: NB. Younger Age HigherRI JULY2018 By A.M.Abodahab – Ass.Lecturer of radiology SohagUniversity

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