Narrowed beam width in newer ultrasound machines shortens measurements in the lateral direction: fetal measurement charts may be obsolete

Økland, Inger; Bjåstad, Tore; Johansen, Tonni Franke; Gjessing, Håkon K.; Grøttum, Per; Eik‐Nes, S. H.

doi:10.1002/uog.8954

Cited by 24 publications

(23 citation statements)

References 24 publications

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“…This finding was afterwards supported by Økland et al 5 who described a difference of 1 mm in FL measurements obtained in different years and were able to reproduce them artificially.…”

Section: International Standards For Fetal Growth: Relevance Of Advansupporting

confidence: 58%

International standards for fetal growth: relevance of advances in ultrasound technology

Morales‐Roselló

Hervás‐Marín

Stirrup

et al. 2015

Ultrasound in Obstet & Gyne

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“…This finding was afterwards supported by Økland et al 5 who described a difference of 1 mm in FL measurements obtained in different years and were able to reproduce them artificially.…”

Section: International Standards For Fetal Growth: Relevance Of Advansupporting

confidence: 58%

International standards for fetal growth: relevance of advances in ultrasound technology

Morales‐Roselló

Hervás‐Marín

Stirrup

et al. 2015

Ultrasound in Obstet & Gyne

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“…18, 19 The mean twin EFWs in our study were generally lower than another U.S. prospective study of 35 twins published in 1987. 5 These dissimilar results may be at least partly due to differences in study populations (as ours focused on a more contemporary population), accuracy of measurements including shorter measurements with newer ultrasound machines due to a narrower beam width 20 or other potential confounders. In the present study, a standardized ultrasound protocol was implemented to ensure high quality measurements and confirmed by our quality control analysis.…”

Section: Commentmentioning

confidence: 91%

Dichorionic twin trajectories: the NICHD Fetal Growth Studies

Grantz

Grewal

Albert

et al. 2016

American Journal of Obstetrics and Gynecology

131

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Background Systematic evaluation and estimation of growth trajectories in twins require ultrasound measurements across gestation, performed in controlled clinical settings. Currently there are few such data for contemporary populations. There is also controversy about whether twin fetal growth should be evaluated using the same benchmarks as singleton growth. Objectives Our objective was to empirically define the trajectory of fetal growth in dichorionic twins using longitudinal two-dimensional ultrasonography and to compare the fetal growth trajectories for dichorionic twins with those based on a growth standard developed by our group for singletons. Study Design A prospective cohort of 171 women with twin gestations was recruited from eight U.S. sites from 2012 to 2013. After an initial sonogram at 11w0d–13w6d where dichorionicity was confirmed, women were randomized to one of two serial ultrasonology schedules. Growth curves and percentiles were estimated using linear mixed models with cubic splines. Percentiles were compared statistically at each gestational week between the twins and 1,731 singletons, after adjustment for maternal age, race/ethnicity, height, weight, parity, employment, marital status, insurance, income, education and infant sex. Linear mixed models were used to test for overall differences between the twin and singleton trajectories using likelihood ratio tests of interaction terms between spline mean structure terms and twin-singleton indicator variables. Singleton standards were weighted to correspond to the distribution of maternal race in twins. For those ultrasound measurements where there were significant global tests for differences between twins and singletons, we tested for week-specific differences using Wald tests computed at each gestational age. In a separate analysis, we evaluated the degree of reclassification in small for gestational age, defined as below the 10th percentile that would be introduced if fetal growth estimation for twins was based upon an unweighted singleton standard. Results Women underwent a median of 5 ultrasounds. The 50th percentile abdominal circumference and estimated fetal weight trajectories of twin fetuses diverged significantly beginning at 32 weeks, while biparietal diameter in twins was smaller from 34 through 36 weeks. There were no differences in head circumference or femur length. The mean head circumference/abdominal circumference ratio was progressively larger for twins compared with singletons beginning at 33 weeks, indicating a comparatively asymmetric growth pattern. At 35 weeks, the average gestational age at delivery for twins, the estimated fetal weights for the 10th, 50th and 90th percentiles were 1960, 2376, and 2879 g for dichorionic twins and 2180, 2567, and 3022 g for the singletons. At 32 weeks, the initial week when the mean estimated fetal weight for twins was smaller than that of singletons, 34% of twins would be classified as small for gestational age using a singleton, non-Hispanic white standard. By 35 weeks, 38% of...

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“…To correct for the narrowed beam width in newer ultrasound scanners, which is demonstrated to shorten measurements in the lateral direction21, a correction for the time period5 that applies to the FL measurements was included for the two newer models. The collection of the data in this study started in 1988, and newer prediction models should not be unrestrictedly applied to older data.…”

Section: Methodsmentioning

confidence: 99%

Advantages of the population‐based approach to pregnancy dating: results from 23 020 ultrasound examinations

Økland

Nakling

Gjessing

et al. 2012

Ultrasound in Obstet & Gyne

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Narrowed beam width in newer ultrasound machines shortens measurements in the lateral direction: fetal measurement charts may be obsolete

Abstract: Objectives

Cited by 24 publications

References 24 publications

International standards for fetal growth: relevance of advances in ultrasound technology

International standards for fetal growth: relevance of advances in ultrasound technology

Dichorionic twin trajectories: the NICHD Fetal Growth Studies

Advantages of the population‐based approach to pregnancy dating: results from 23 020 ultrasound examinations

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