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The effect of image size on nuchal translucency measurement
Andrew Edwards1, Sheila Mulvey, Euan M Wallace
1Fetal Diagnostic Unit, Monash Medical Centre, Monash University, Clayton, Victoria, Australia.
Prenatal Diagnosis
|April 4, 2003
Abstract
Objectives:
To assess the effect of altering image size on the absolute nuchal translucency (NT) measurement.
Methods:
NT was measured at three image magnifications (60%, 100% and 200%) in 120 singleton pregnancies.
Results:
The mean +/- SD NT measurements were 1.52 +/- 0.57 mm, 1.35 +/- 0.53 mm and 1.18 +/- 0.48 mm at 60%, 100% and 200% magnification, respectively (p = 0.00001).
Conclusions:
The measurement of NT decreases significantly with increasing image size. Optimisation of NT as a method of screening will require agreed standardisation of image magnification.