Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine
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Comparative Study
Correlation of visual axis and coronal axis measurements of the optic nerve sheath diameter.
There are several approaches to sonographic imaging and measurement of the optic nerve sheath diameter (ONSD). In this study, we sought to compare visual axis measurements of the optic nerve sheath (ONS) with traditional coronal axis measurements to assess for correlation. ⋯ Visual axis measurements do not reliably correlate with coronal axis measurements. The consistently larger diameter measured in the visual axis as well as the gradually increasing diameter posteriorly suggests measurement of an artifactual shadow rather than the true ONS.