A Unique Model for ONSD Part II: Inter/Intra-operator Variability

Area of Science:

• Medical Imaging
• Ophthalmology
• Ultrasound Technology

Background:

• Accurate measurement of the optic nerve sheath diameter (ONSD) is crucial in clinical practice.
• Variability in ONSD measurements can impact diagnostic accuracy.
• Novel simulation models offer potential for standardized training.

Purpose of the Study:

• To evaluate a novel ultrasound model for ONSD measurement.
• To determine the intra- and inter-operator variability of this new technique.
• To assess the impact of operator experience on ONSD measurement reliability.

Main Methods:

• Ten ONSD measurements per model by a single experienced operator to assess intra-operator variability.
• Seven operators measured ONSD twice in eight models to determine inter-operator variability.
• Analysis using a three-level linear statistical model.

Main Results:

• Intra-cluster correlation coefficients for experienced and novice operators were 0.643 and 0.453, respectively, showing improved intra-operator variability with experience.
• Inter-cluster correlation coefficient was 0 for novice operators, indicating negligible difference among operators.
• A strong linear relationship was found between actual model disc size and ultrasound ONSD measures, confirming image reliability.

Conclusions:

• The novel model demonstrates moderate intra-operator reliability for ONSD ultrasonography.
• No significant difference was observed among multiple operators in ONSD measurements.
• The model shows potential for simulation-based training to improve ONSD ultrasound technique.