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SUMMARY OF DOPPLER PARAMETERS

SUMMARY OF DOPPLER PARAMETERS. SUMMARY OF DOPPLER PARAMETERS. N.B.THIS SUMMARY IS HELPFUL FOR WHO's ALLREADY TRAINED TO USE DOPPLER.  Main Types of flow : - Arterial - Venous  SETTING: Don't forget to adjust Mode of scan “Arterial , Venous , Abd. , scrotal …..etc”

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SUMMARY OF DOPPLER PARAMETERS

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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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