1Department of Clinical Pathology Jichi Medical School, 2Aloka Co., 3Department of Nephrology Jichi Medical School
We developed a method for presenting a velocity profile of a blood flow by modifying an ordinary ultrasonographic apparatus to enable it to measure flow velocity with color-Doppler signals. Conventional pulsed-Doppler methods, employing multi-gate laser Doppler, hot film, or nuclear magnetic resonance, require an
apparatus designed specifically for the purpose; they are also time-consuming and require expertise. Temporal resolution was 40 to 100 msec, depending on the frame rate of the color-Doppler images. One profile
can be produced several seconds after freezing the color-Doppler image. Velocity-mode profiles of the common carotids and abdominal aorta were of a central flat pattern, not of the parabolic pattern reported in previous studies. Flow velocity in the common hepatic artery was faster in the outer than in the inner stream,
probably because of arterial curvature. The present method can also provide a power-mode profile of a blood
flow, although the clinical significance of this profile remains to be elucidated. This method can be used to
assess blood flow in diseased arteries as well as in the venous system.