Hala Wafik Elfayoumy <br/><br/>
Accuracy of linear measurements of ultra-low dose cone beam computed tomography and digital panoramic radiography performed on mandibular anaesthetic landmarks versus real mandibular measurements :   A diagnostic accuracy study /  
 تقييم دقة القياسات الخطية للأشعة المقطعية بالحاسوب مخروطية الشعاع ذات الجرعة شديدة الانخفاض واشعة البانوراما الرقمية فى أماكن التخدير بالفك السفلى مقابل قياسات الفك السفلى الحقيقية :   دراسة للدقة التشخيصية 
Hala Wafik Elfayoumy ; Supervised Hoda Abdelkader Saleh , Mohamed Khalifa Zayet , Iman Dakhli 
 - Cairo :   Hala Wafik Elfayoumy ,   2020 
 - 169 P. :   charts , facsimiles  ;   25cm  
<br/><br/>Thesis (Ph.D.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Oral (Radiology) 
<br/><br/> Aim: This study was conducted to evaluate the accuracy of linear measurements performed on mandibular anaesthetic landmarks obtained by ultra-low-dose cone beam computed tomography and digital panoramic radiography in comparison with real measurement on dry mandible. Methodology: A total number of nine dry human mandibles were selected and mandibular anaesthetic landmarks were marked using gutta-percha. The dry mandibles were submitted for digital panoramic radiography and cone beam computed tomography with mini-dose parameters using the SOREDEX CRANEX 3Dx unit, linear measurements were performed on SCANORA Lite image viewer and OnDemand 3D viewer. The real linear measurements were measured using digital caliper. Results: There was a statistically significant difference in all measurements performed on digital panoramic radiographs, reformatted panoramic images underestimate real linear vertical measurements without significant difference, the absolute error for the cross-sectional views of CBCT ranged from 0.0001 to 1.44mm for mandibular foramen linear measurements, using mini-dose parameters did not affect image quality nor measurements accuracy. Conclusions: Linear measurements driven from CBCT cross-sectional images using On Demand software are accurate and have the lowest error value; therefore it is considered one of the most important imaging modality for preoperative surgical site assessment 
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<br/><br/><label>Subjects--Index Terms: </label>Digital panoramic radiography   Linear measurements  Ultra-low dose cone beam computed tomography