Case Studies In Small Animal

Cardiovascular Medicine

Home Up .    Radiographs 2D Echo Color Flow Contrast Echo Doppler Diagnosis

Case 7

Color Flow Doppler

colorps.jpg (18948 bytes)

Color flow Doppler of the pulmonic valve region in systole (the arrow on the ECG shows the phase of the cardiac cycle and is right after the QRS complex). The flow starts off as laminar blood flow, flowing away from the transducer (blue) in the right ventricular outflow tract (RVOT). It aliases (turns from blue to gold) when the velocity exceeds 0.64 meters/second (the Nyquist limit on the color bar to the left) just before the pulmonic valve. At the pulmonic valve, the flow signal narrows. It then broadens in the main pulmonary artery (PA) into a large turbulent jet.

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This is the same view as above but is taken in diastole instead of in systole. A low velocity jet originates at the pulmonic valve and extends back into the right ventricular (RV) outflow tract. One can tell that it is low velocity because it only aliases (has distinct color changes as the Nyquist limit is exceeded) and does not attain the mosaic pattern of a high velocity turbulent jet.

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A color flow Doppler image taken in systole from the tricuspid valve region. A high velocity jet originates at the tricuspid valve and extends back into the right atrium (RA). The jet is turbulent at its origin and for about one centimeter into the right atrium. It then loses momentum and becomes a broader, lower velocity jet as it dissipates in the large right atrium.

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Mark D. Kittleson, D.V.M., Ph.D. All rights reserved.