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Color Flow Imaging Basics: Scanning Technique

Color Flow imaging (CFI) quickly provides a tremendous amount of valuable blood flow information. Examining each blood flow pattern in several different imaging views allows a more accurate assessment of blood flow.

Color Flow Imaging is a two-dimensional technique for evaluating three-dimensional blood flow over time. Ultrasound provides only a very thin “slice” of the heart at any one time. It is critical that you scan through the third dimension of the heart by tilting or rotating the transducer to identify any abnormal flow.

The most common mistake made by people new to color flow imaging is to believe the first image they see on the screen and to look no further. As with conventional Doppler, the strongest blood flow signal is not always visable in the plane that gives the best 2-D image. Always move the transducer through the third dimension to obtain the most accurate picture of blood flow dynamics. You will learn to use non-standard imaging planes and windows as you become more adept at following blood flow. CFI protocols vary between labs with some using CFI routinely in every view while others use color only when they discover an abnormality. Regardless of the protocol used, color flow imaging easily integrates into your ultrasound examination. After obtaining any standard view, simply: Turn color on. Adjust the transducer angle and the color controls to optimize blood flow. Scan through the third dimension to accurately assess blood flow. If necessary, identity the center of a blood flow jet and position the Doppler beam appropriately.