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1 General aspects (0)   1.1 Epidemiology (4)   1.2 Population genetics (8)   1.3 Pathogenesis (7)   1.4 Quality of life (4)   1.5 Glaucomas as cause of blindness (0)   1.6 Prevention and screening (1) 2 Anatomical structures in glaucoma (0)   2.1 Conjunctiva (1)   2.2 Cornea (3)   2.3 Sclera (1)   2.4 Anterior chamber angle (0)   2.5 Meshwork (8)     2.5.1 Trabecular meshwork (0)     2.5.2 Schlemms canal (0)     2.5.3 Scleral outlet channels (0)   2.6 Aqueous humor dynamics (4)     2.6.1 Production (0)     2.6.2 Outflow (0)       2.6.2.1 Trabecular meshwork (0)       2.6.2.2 Uveoscleral (0)     2.6.3 Compostion (0)   2.7 Episcleral veins and venous pressure (0)   2.8 Iris (3)   2.9 Ciliary body (3)   2.10 Lens (0)   2.11 Vitreous body (0)   2.12 Choroid, peripapillary choroid, peripapillary atrophy (2)   2.13 Retina and retinal nerve fibre layer (14)   2.14 Optic disc (13)   2.15 Optic nerve (1)   2.16 Chiasma and retrochiasmal central nervous system (0)   2.17 Stem cells (0)   2.20 Other (0) 3 Laboratory methods (0)   3.1 Microscopy (2)   3.2 Electron microscopy (0)   3.3 Immunohistochemistry (7)   3.4 Molecular genetics (2)     3.4.1 Linkage studies (0)     3.4.2 Gene studies (0)   3.5 Molecular biology incl. 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(2)

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Abstract #6403 Published in IGR 3-2

Detector sensitivity influences blood flow sampling in scanning laser Doppler flowmetry

Hosking SL; Embleton S; Kagemann L; Chabra A; Jonescu-Cuypers C; Harris A
Graefe's Archive for Clinical and Experimental Ophthalmology 2001; 239: 407-410

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PURPOSE: To establish the effect of photodiode sensitivity on the DC (brightness) value and resultant blood flow measurements of retina and rim tissue using a scanning laser Doppler flowmeter (SLDF). METHODS: The sample consisted of one eye of each of 15 healthy subjects (mean age, 27.8 ± 6.1 years). Using the Heidelberg Retina Flowmeter (HRF), three 10° images of the superior temporal retina and three further images of the superior temporal rim were acquired for each of five DC bands: band 1: 30-70; band 2: 70-110; band 3: 110-150; band 4: 150-190; band 5: 190-230. Retinal blood volume, flow and velocity were determined for each image using a 10 x 10 pixel square grid located at a predetermined location on the retina and rim for each subject. Following image acquisition, the DC values corresponding to each pre-assigned retinal or rim location were determined. The mean and standard deviation were determined for the blood flow parameters within each DC band for each subject in both locations. Analysis of variance was used to identify significant change in the data as a function of the DC value (p < 0.05). RESULTS: Analysis of variance revealed that retinal blood flow measures acquired within DC band 5 resulted in significantly lower measures of blood flow and velocity (p = 0.035 and p = 0.049, respectively) than at lower DC values. Band 5 values of flow, volume and velocity in the neuroretinal rim were also significantly low (p = 0.016, p = 0.003 and p = 0.026, respectively). Peak neuroretinal rim blood flow was recorded when the DC value was between 70 and 100. For blood flow measurement at the retina and neuroretinal rim, the DC value should not exceed 190. CONCLUSION: Photodiode sensitivity as indicated by the DC value affects measurements of ocular blood flow using the HRF.

Dr S.L. Hosking, Neurosciences Research Institute, Aston University, Aston Triangle, Birmingham B4 7ET, UK. s.l.hosking@aston.ac.uk

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Classification:

6.11 Bloodflow measurements (Part of: 6 Clinical examination methods)

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