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Optic Nerve Sheath Point of Care Ultrasound: Image Acquisition
Published on: August 18, 2023
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Optic Nerve Sheath Diameter Measured by Point-of-Care Ultrasound and MRI
Hamid Shokoohi1, Matthew Pyle2, Evan Kuhl2
1Department of Emergency Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
Summary
Ultrasound (US) measurements of optic nerve sheath diameter (ONSD) and optic nerve diameter (OND) showed modest correlation between axial and coronal views. However, no concordance was found between US and MRI findings for assessing intracranial pressure.
Area of Science:
- Ophthalmology
- Radiology
- Medical Imaging
Background:
- Ultrasound (US) measurement of optic nerve sheath diameter (ONSD) and optic nerve diameter (OND) is a common screening method for increased intracranial pressure.
- Accurate measurement is crucial for timely diagnosis and management.
Purpose of the Study:
- To assess the accuracy of US measurements of ONSD and OND.
- To compare US measurements with magnetic resonance imaging (MRI) as the criterion standard.
Main Methods:
- Prospective, single-institution study involving patients requiring emergent brain MRI.
- Orbital US measurements of ONSD and OND in axial and coronal planes.
- MRI measurements of ONSD and OND by two neuroradiologists.
- Correlation and agreement assessed using Pearson's correlations.
Main Results:
- Eighty-two patients were included.
- Mean ONSD by MRI: 5.6 mm (axial), 5.7 mm (coronal).
- Mean ONSD by US: 6.22 mm (axial), 5.52 mm (coronal).
- Mean OND by US: 4.31 mm (axial), 3.68 mm (coronal).
- Modest correlation between axial and coronal ONSD by US (r² = .385).
- No significant correlation found between US and MRI measurements.
Conclusions:
- US measurements demonstrated a modest correlation between axial and coronal ONSD.
- No concordance was found between US and MRI measurements for ONSD and OND in this setting.
