Glaucoma severity affects diffusion tensor imaging (DTI) parameters of the optic nerve and optic radiation

Sidek, S. and Ramli, N. and Rahmat, K. and Ramli, N.M. and Abdulrahman, F. and Tan, L.K. (2014) Glaucoma severity affects diffusion tensor imaging (DTI) parameters of the optic nerve and optic radiation. European Journal of Radiology, 83 (8). pp. 1437-1441. ISSN 0720-048X,

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Abstract

Objectives: To evaluate whether MR diffusion tensor imaging (DTI) of the optic nerve and optic radiation in glaucoma patients provides parameters to discriminate between mild and severe glaucoma and to determine whether DTI derived indices correlate with retinal nerve fibre layer (RNFL) thickness. Methods: 3-Tesla DTI was performed on 90 subjects (30 normal, 30 mild glaucoma and 30 severe glaucoma subjects) and the FA and MD of the optic nerve and optic radiation were measured. The categorisation into mild and severe glaucoma was done using the Hodapp-Parrish-Anderson (HPA) classification. RNFL thickness was also assessed on all subjects using OCT. Receiver operating characteristic (ROC) analysis and Spearman's correlation coefficient was carried out. Results: FA and MD values in the optic nerve and optic radiation decreased and increased respectively as the disease progressed. FA at the optic nerve had the highest sensitivity (87) and specificity (80). FA values displayed the strongest correlation with RNFL thickness in the optic nerve (r = 0.684, p <= 0.001) while MD at the optic radiation showed the weakest correlation with RNFL thickness (r = -0.360, p <= 0.001). Conclusions: The high sensitivity and specificity of DTI-derived FA values in the optic nerve and the strong correlation between DTI-FA and RNFL thickness suggest that these parameters could serve as indicators of disease severity. (C) 2014 Published by Elsevier Ireland Ltd.

Item Type:	Article
Funders:	UNSPECIFIED
Additional Information:	ISI Document Delivery No.: AL2AH Times Cited: 0 Cited Reference Count: 24 Sidek, S. Ramli, N. Rahmat, K. Ramli, N. M. Abdulrahman, F. Tan, L. K. University of Malaya Institutional Research Grants RG390-11HTM, J-20518-73808, P0083/2012A This study and the authors have received funding in parts from the University of Malaya Institutional Research Grants (GRANT NOS: RG390-11HTM, J-20518-73808 and P0083/2012A). Elsevier ireland ltd Clare
Uncontrolled Keywords:	Glaucoma, MRI, Diffusion tensor imaging, Optic pathway, Degeneration, multiple-sclerosis, clinical severity, white-matter, fiber layer, degeneration, system, size
Subjects:	R Medicine
Divisions:	Faculty of Medicine
Depositing User:	Ms azrahani halim
Date Deposited:	11 Nov 2014 04:37
Last Modified:	11 Nov 2014 04:37
URI:	http://eprints.um.edu.my/id/eprint/11094

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