Automated Segmentation of Infected Regions in Chest CT Images of COVID-19 Patients using Supervised Naïve Gaussian Bayes Classifier

In this paper, one hundred chest Computed Tomography images of COVID-19 patients were used to build and test Naïve Gaussian Bayes classifier for discriminating normal from abnormal tissues. Infected areas in these images were manually segmented by an expert radiologist. Pixel grey value, local entropy and Histograms of Oriented Gradients HOG were extracted as features for tissue image classification. Based on five-folds classification experiments, the accuracy score of the classifier in this fold reached around 79.94%. Classification was more precise (85%) in recognizing normal tissue than abnormal tissue (63%). The effectiveness in identifying positive labels was also more evident with normal tissue than the abnormal one.

Comparison of retinal nerve fiber layer (RNFL) thickness and perimetry findings in glaucomatous patients

Aim: to determine the value of RNFL thickness at which visual field defect becomes detectable. Methods: Our study included 29 normal subject and 36 glaucomatous patient (one eye per person) .Every person was examined by OCTOPUS perimetry with glaucoma 30-2 program, and peripapillary RNFL thickness was measured by HIEDELBERGSPECTRALIS SD_OCT. Results: comparison of results showed higher sensitivity of OCT compared to Perimetry. Mean RNFL thickness at which visual field defect showed was 87 microns. Superior RNFL thickness value which correlated with inferior visual field defect was 101 microns, whereas inferior RNFL thickness value which correlated with superior visual field defect was 75 microns .and the difference in RNFL thickness between normal and glaucomatous visual field was significant (p<0.001). Conclusion: in open-angle glaucoma , it needs significant thinning in RNFL before visual field defects becomes detectable.

Evaluation of the Upper Airway Changes in Class II Patients Resulting From Functional Treatment Using Cone Beam Computed Tomography - An In Vivo Study

Objective: This research aimed to evaluate the three-dimensional effects of a Twin Block (TB) appliance on the pharyngeal airway passage (PAP) in a sample of Class II patients with mandibular retrusion using cone-beam computed tomography (CBCT).

The Effect of Rapid Maxillary Expansion on the Spheno-occipital Synchondrosis in Children using Cone Beam Computed Tomography

The RME force is not only concentrated on widening the maxilla, it is concomitant changes occur in craniofacial sutures, from here the need for this study was originated. Aim of the study: To investigate the immediate effect of rapid maxillary expansion on the spheno-occipital Synchondrosis in children using cone beam computed tomography.

Three-dimensional Assessment of Skeletal Effects Following Rapid Maxillary Expansion Using Conebeam Computed Tomography

In this study, 24 patients with posterior skeletal cross-bite were treated at Orthodontics Department-Faculty of Dentistry in Hama University. Hyrax expansion device was applied in all patients and the results were assessed after active expansion period. Cone beam computed tomography radiograph were taken at the assessment times. Results showed that the midpalatal suture width has increased significantly at all measured areas. The results revealed that significant tipping in the canines , premolars and molars was recorded in this study.

تقييم الدقة التشخيصية للتصوير المقطعي المحوسب ذي الحزمة المخروطية والتصوير الشاعي التقليدي في تحديد التوضع ثلاثي الأبعاد للانياب العلوية المنطمرة

تقييم الدقة التشخيصية للتصوير المقطعي المحوسب ذي الحزمة المخروطية والتصوير الشاعي التقليدي في تحديد التوضع ثلاثي الأبعاد للانياب العلوية المنطمرة