Objective: To examine the impact of a new image enhancement technique on the distribution of NT measurements.
Methods: In this retrospective study, nuchal translucency (NT) images that were taken with the GE Voluson E22 ultrasound machine between May and September 2024 were collected. One operator took manual and automated NT measurements in an NT image without radiant enhancement mode followed by automated measurements in NT images with minimum, medium and maximum radiant mode. The automated measurement in the NT images without radiant mode were considered gold standard. The relative bias of the gold standard, the manual measurement and the automated measurements with the radiant enhancement technology were compared using median and 25-75th interquartile range as well as by the Wilcoxon test.
Results: The database search yielded 352 NT images from 101 pregnant women. Average maternal age of the study population was 34.0 years and average crown-rump length was 68.3. The median NT thickness was 1.7 mm for both the manual and automated measurements done without the use of radiant mode. The median automated measurement with minimum, medium and maximum radiant mode was 2.00, 2.05 and 2.10 mm, respectively. All automated measurements were significantly higher than the gold standard.
Discussion: The use of the radiant mode results in an increase in the NT thickness. This effect should be taken into account when calculating the risk for chromosomal abnormalities.
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