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Related Experiment Video

Updated: Apr 14, 2026

Optic Nerve Sheath Point of Care Ultrasound: Image Acquisition
06:09

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Measurement of Optic Nerve Sheath Diameter: Differences between Methods? A Pilot Study.

C Giger-Tobler1, J Eisenack1, D Holzmann2

  • 1University Hospital Zurich, Department of Ophthalmology, Zurich, Switzerland (Chair: Prof. Klara Landau).

Klinische Monatsblatter Fur Augenheilkunde
|April 23, 2015
PubMed
Summary
This summary is machine-generated.

Optic nerve sheath diameter measurements using computed tomography and magnetic resonance imaging are comparable. Ultrasound measurements showed less reliability compared to computed tomography and magnetic resonance imaging for detecting intracranial pressure.

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Area of Science:

  • Neuroimaging
  • Ophthalmology
  • Medical Diagnostics

Background:

  • Optic nerve sheath diameter (ONSD) quantification is a key indicator for elevated intracranial pressure.
  • The comparability of ONSD measurement techniques remains unclear.
  • This study evaluates ONSD measurement consistency across different imaging modalities.

Purpose of the Study:

  • To assess the relationship between ONSD measurements obtained via computed tomography (CT), magnetic resonance imaging (MRI), and ultrasound.
  • To compare the reliability of these methods in patients without known optic nerve disease or elevated intracranial pressure.

Main Methods:

  • 15 patients with paranasal sinus pathology underwent ONSD measurements using ultrasound, CT, and MRI.
  • Maximal ONSD values were measured 3 mm behind the globe for each modality.
  • Ultrasound, CT, and MRI derived ONSD values were statistically compared.

Main Results:

  • Ultrasound ONSD measurements (mean 6.2 mm) were significantly higher than those from CT (5.2 mm) and MRI (5.3 mm) (p<0.01).
  • No significant difference was found between CT and MRI ONSD measurements (p=0.24).

Conclusions:

  • CT and MRI demonstrate comparable ONSD measurements in patients with normal intracranial pressure.
  • Ultrasound ONSD measurements appear less reliable when compared to CT and MRI for assessing intracranial pressure.