التفاصيل البيبلوغرافية
| العنوان: |
Objective Detection of Retinal Vessel Pulsation. |
| المؤلفون: |
Morgan, William H.1 BillMorgan@lei.org.au, Abdul-Rahman, Anmar2, Yu, Dao-Yi1, Hazelton, Martin L.3, Betz-Stablein, Brigid3, Lind, Christopher R. P.4 |
| المصدر: |
PLoS ONE. Feb2015, Vol. 10 Issue 2, p1-10. 10p. |
| مصطلحات موضوعية: |
*RETINAL blood vessel diseases, *INTRACRANIAL pressure, *GLAUCOMA, *LIGHT absorption, *DATA analysis, *OPHTHALMODYNAMOMETRY |
| مستخلص: |
Purpose: Retinal venous pulsation detection is a subjective sign, which varies in elevated intracranial pressure, venous obstruction and glaucoma. To date no method can objectively measure and identify pulsating regions. Method: Using high resolution video-recordings of the optic disk and retina we measured fluctuating light absorption by haemoglobin during pulsation. Pulsation amplitude was calculated from all regions of the retinal image video-frames in a raster pattern. Segmented retinal images were formed by objectively selecting regions with amplitudes above a range of threshold values. These were compared to two observers manually drawing an outline of the pulsating areas while viewing video-clips in order to generate receiver operator characteristics. Results: 216,515 image segments were analysed from 26 eyes in 18 research participants. Using data from each eye, the median area under the receiver operator curve (AU-ROC) was 0.95. With all data analysed together the AU-ROC was 0.89. We defined the ideal threshold amplitude for detection of any pulsating segment being that with maximal sensitivity and specificity. This was 5 units (95% confidence interval 4.3 to 6.0) compared to 12 units before any regions were missed. A multivariate model demonstrated that ideal threshold amplitude increased with increased variation in video-sequence illumination (p = 0.0119), but between the two observers (p = 0.0919) or other variables. Conclusion: This technique demonstrates accurate identification of retinal vessel pulsating regions with no areas identified manually being missed with the objective technique. The amplitude values are derived objectively and may be a significant advance upon subjective ophthalmodynamometric threshold techniques. [ABSTRACT FROM AUTHOR] |
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