Mary M.C.V.S.,Francis Xavier Engineering College |
Mary M.C.V.S.,Karunya University |
Rajsingh E.B.,Karunya University |
Jacob J.K.K.,Tirunelveli Medical College Hospital |
And 3 more authors.
Biomedical Signal Processing and Control | Year: 2015
The accurate segmentation of the optic disc (OD) offers an important cue to extract other retinal features in an automated diagnostic system, which in turn will assist ophthalmologists to track many retinopathy conditions such as glaucoma. Research contributions regarding the OD segmentation is on the rise, since the design of a robust automated system would help prevent blindness, for instance, by diagnosing glaucoma at an early stage and a condition known as ocular hypertension. Among the evaluated OD segmentation schemes, the active contour models (ACMs) have often been preferred by researchers, because ACMs are endowed with several attractive properties. To this end, we designed an OD segmentation scheme to infer how the performance of the well-known gradient vector flow (GVF) model compares with nine popular/recent ACM algorithms by supplying them with the initial OD contour derived from the circular Hough transform. The findings would hopefully equip a diagnostic system designer with an empirical support to ratify the choice of a specific model as we are bereft of such a comparative study. A dataset comprising 169 diverse retinal images was tested, and the segmentation results were assessed by a gold standard derived from the annotations of five domain experts. The segmented ODs from the GVF-based ACM coincide to a greater degree with those of the experts in 94% of the cases as predicted by the least overall Hausdorff distance value (33.49 ± 18.21). Additionally, the decrease in the segmentation error due to the suggested ACM has been confirmed to be statistically significant in view of the p values (≤1.49e-09) from the Wilcoxon signed-rank test. The mean computational time taken by the investigated approaches has also been reported. © 2014 Elsevier Ltd. All rights reserved.
PubMed | Tirunelveli Medical College Hospital
Type: Journal Article | Journal: Indian journal of psychiatry | Year: 2011
An epidemiological study was conducted in Madurai to assess the prevalence of psychiatric problems in school children using Rutter B Scale. After screening 755 children by Rutter B Scale, 207 children were subjected to clinical evaluation and parental interview. Psychiatric morbidity was found to be 33.7%. The prevalence rate for (Afferent disorders were as follows: Conduct disorder 11.1%; Enuresis 14.3%; Hyperkinetic Syndrome 1.7%; Mental retardation 2.9%. Low intelligence, lower socio-econemic status and lack of parental involvement in childrens studies were significantly related to psychiatric morbidity. The Rutter B Scale is an useful screening instrument in epidemiological surveys.