Abstract
Grey-level histogram width (GLHW) values of fetal lung and liver were studied in 52
healthy fetuses in 24 to 38 weeks of pregnancy, comparing them to the mean grey level
(MGL), grey-level standard deviation (GLSD) and the coefficient of variation (GLCV).
Fetal lung GLHW was larger in 30–38 weeks than at 24–29 weeks, but there was no change
in liver GLHW. GLHW was smaller in fetal lung than in the liver in 24–29 weeks, with
no difference in 30–38 weeks. The lung/liver GLHW ratios were less than 1 in 24–29
weeks, but they were 1 or more in 30–35 weeks. Both MGL of fetal lung and liver showed
linear increases during pregnancy, but no difference was found between the two. Fetal
lung GLSD tended to decrease during pregnancy. The GLCV values of fetal lung and liver
decreased during pregnancy, and differed between 24–29 weeks and 30–38 weeks, whereas
there was no difference between fetal lung and liver. The correlation coefficients
of GLHW and MGL of fetal lung and liver to the weeks of pregnancy were moderate, and
the coefficients of GLSD and GLCV to the weeks of pregnancy were small. In conclusion,
quantitatively measured echogenicity of fetal lung increased in 30 or more weeks of
pregnancy, and suggested antepartum changes of fetal lung tissue. The GLHW is reliable,
because it was reproducible in various gain settings of various ultrasonic imaging
devices. The MGL, GLSD and GLCV are less reliable, because the grey level varied by
the gain changes among various machines.
Keywords
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References
- Prediction of fetal lung maturity.Radiology. 1985; 155: 473-475
- Fetal lung to liver reflectivity ratio and lung maturity.J Clin Ultrasound. 1987; 15: 384-387
- Echogenicity of fetal lung.Am J Radiol. 1985; 145: 591-594
- The ultrasonic changes in maturing placenta and the relation to fetal pulmonic maturity.Am J Obstet Gynecol. 1979; 133: 915-922
- Ultrasonic tissue characterization of ovarian tumors by the scanning of grey-level histograms.Yonago Acta Medica. 1989; 32: 251-260
- Ultrasound tissue characterization.in: Chervenak F.A Isaacson G.C Campbell S Ultrasound in obstetrics and gynecology. Little Brown, Boston1993: 55-59
- Quantification of sonographic echogenicity with grey-level histogram width.Ultrasound Med Biol. 1998; 24: 225-234
NIH Consensus Statement. Effect of corticosteroids for fetal maturation on perinatal outcomes. 1994; 12(2).
- Testing for fetal lung maturity.Int J Gynecol Obstet. 1997; 59: 255-256
- Observation of fetal lung reflectivity using real-time ultrasound.Aust NZ J Obstet Gynaecol. 1984; 24: 91-94
- Die sonographische Diagnostik der fetalen Lungenreife.Z Geburts Perinatol. 1992; 196: 55-60
- Fetal and perinatal postmortem examination.in: Chervenak F.A Isaacson G.C Campbell S Ultrasound in obstetrics and gynecology. Little Brown, Boston1993: 1181-1209
- Fetal periventricular ultrasonic echodensity detected in 3 cases of uneventful pregnancy. Abstracts of the 48th Congress of Japan Society of Obstetrics and Gynecology.Acta Obstet Gynaecol Jpn. 1996; 48: 463
Article info
Publication history
Accepted:
September 28,
1998
Received:
March 13,
1998
Identification
Copyright
© 1999 World Federation for Ultrasound in Medicine & Biology. Published by Elsevier Inc. All rights reserved.
