P19Evaluation of fetal lung maturity by the gray level histogram width

Abstract

Maeda has normalized gray level histogram width (GLHW) of fetal lung and liver. The fetal lung GLHW was less than 30% and smaller than the liver in 24–29 weeks. However the fetal lung GLHW was similar to the liver and over 30% after 30 weeks. We suggest this change of GLHW have relation to fetal lung maturity.MethodThe histogram was described with Aloka SSD‐1200, the 1250pixels were set at fetal lung and liver. GLHW is obtained by the histogram base length is divided by the full gray scale length. The 10 fetuses lung and liver were recorded in 24–31 weeks, and amniotic fluid samplings by transvaginal or amniocentesis were examined microbubble test. They were delivered during 1–3 days later, we diagnosed RDS or nonRDS by clinically.ResultThe GLHW of fetal lung/liver was 32.45/34.03 in 5 fetuses less than 10 microbubble rate and nonRDS (Group 1), no significant difference. The GLHW of fetal lung/liver was 30.23/34.44 in 5 fetuses over 10 microbubble rate and RDS (Group 2), significant difference (PÅÅ0.016). The fetal lung GLHW was no significant difference in group 1 and 2 (32.45/30.23) (P = 0.064), however, in the over 30 fetal lung GLHW, 5 were nonRDS and 2 were RDS, in less than 30 fetal lung GLHW, all are RDS, significant difference (P = 0.04).ConclusionThe fetus of fetal lung GLHW is smaller than liver and less than 30 is almost RDS, the case of fetal lung GLHW is larger than liver and over 30 is almost nonRDS.