2004 年 17 巻 1 号 p. 18-23
Four-dimensional reconstructions of power flow Doppler images disclosed the differences in pulsatility patterns between normal neonates and neonates with asphyxia. The differences could not be explained by conventional quantative analysis, including blood velocity, resistance index and pulsatility index. There was a minor difference in pulsatility patterns by four-dimensional analysis of PF between two normal neonates. Wavelet analysis disclosed a difference between the two neonates in signal intensity at levels 5 and 6 by use of the Gabor 8 function. There was a positive correlation between the signal intensity in end-diastolic phase at levels 5 and 6 by Gabor 8 and the intensity of the pulsatility patterns in four-dimensional analysis. There were strong bands at levels 5 and 6 in twelve normal neonates, but weak bands in four neonates with asphyxia.