Observer variation in the sonographic measurement of optic nerve sheath diameter in normal adults
| Autor: | Ruth Hamilton, S.A Ballantyne, A.S. Hollman, G O'Neill |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Adult
Male Optic nerve sheath medicine.medical_specialty Acoustics and Ultrasonics Observer (quantum physics) General Chemical Engineering Bioengineering Humans Medicine Examination technique Radiology Nuclear Medicine and imaging Myelin Sheath Ultrasonography Observer Variation business.industry Ultrasound Mean value Reproducibility of Results Optic Nerve Middle Aged Surgery Optic nerve Female business Nuclear medicine Observer variation |
| Zdroj: | European Journal of Ultrasound. 15:145-149 |
| ISSN: | 0929-8266 |
| DOI: | 10.1016/s0929-8266(02)00036-8 |
| Popis: | Aim: To quantify the observer variation in the sonographic measurement of optic nerve sheath diameter (ONSD) in normal adults. Materials and methods: Sixty-seven normal adult volunteers underwent ultrasound examination of each eye by three independent observers using a 7 MHz sector probe. Three measurements were made of each eye by each observer and a mean value calculated for each eye. Median and 5th–95th centile values for both intra- and inter-observer variation were calculated for the three observers. Results: The median intra-observer variation was ±0.1 mm, with 5th–95th centile values of ±0–0.4 mm. The median inter-observer variation was ±0.2–0.3 mm, with 5th–95th centile values of ±0–0.7 mm. Careful review of examination technique by the three observers after the first 17 examinations was shown to reduce both intra- and inter-observer variation. Conclusion: The sonographic measurement of ONSD is a readily learned, reproducible technique with low intra- and inter-observer variation. The average inter-observer variation (±0.2 mm) is comparable to the inherent variability of the ultrasound machine. The importance of standardisation of examination technique is stressed. |
| Databáze: | OpenAIRE |
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