Intraventricular hemorrhage, which is one of major causes of death of premature babies, has been studied by comparison of conventional echo images with artery pulsation images obtained from a series of moving echo images. It is observed in a number of images that artery pulsation is decreased in the region where a clot of blood is, which can be identified as a high-density region in the echo image, and it is also decreased in the other region. The observed results can be well explained by the facts that the region of blood clot is not always coincided with the hemorrhage part and that the strength of blood flow is reflected in the artery pulsation image while the existence of blood clot is only observed in the conventional echo image. It is thus confirmed that the artery plusation image is useful to diagnose the intraventricular hemorrhage in premature babies.