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Basics of Doppler Ultrasound
Dr.Akshai George Paul
Normal Flow in Arteries and Veins
Arteries
• Doppler spectrum is a time velocity wave form that rapresents
variation in intravascular blood flow in cardiac cycle.
• Time is in horizontal axis and in vertical axis is frequency
shift(velocity)
Hyperemic monophasic flow is seen in
• Fever
• Exercise
• Temporary arterial occlusion by BP Cuff
Veins
1.Spontaneity
• Spontaneous flow with out augmentation
2.Phasicity
• Flow changes with respiration
3.Compression
• Normal vein is able to collapse showing its patency
• Non Compressible-Thrombosis
4.Augmentation
• Applying compression distal to the site of examination
• If there is increase venous flow transmitted to the area of evaluation-
suggests no occlusive thrombus exists.
5.Valsalva
• It increases intraabdominal and intrathoracic pressure
• It causes decreased venous return
• Highlighting any connection between source of reflux and refluxing
vessel
THANK YOU

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Basics of Doppler Ultrasound .pptx