Diagnostic Accuracy of Two Softwares for Detection of Intra-Bony Lesions in Multi-Detector Computed Tomography

Background: Bony jaw lesions have varied radiographic appearance and may pose difficulty in establishing radiographicdifferential diagnosis. Computed tomography is a useful tool to facilitate the correct diagnosis of these bony lesions.Objectives: To compare the volumetric measurement of bony lesions of the jaw using two commercially available softwaresfor the evaluation of CT imaging. Material and Methods: All patients were subjected for multi-slice CT scanning. Thevolumetric measurements were performed using two softwares; Myrian and Siemens. Results: This study was conducted on15 patients of both genders; males (66.7%) and females (33.3%), where 21 diagnosed lesions with an intra-bony spaceaffecting one or both of the jaws were included in the measurements. Myrian software showed statistically lower mean ofvolumetric measurement than Somatom (P-value <0.001). Conclusion: Although, Myrian software showed statisticallylower mean of volumetric measurement than Somatom. The clinicalrelevance of these finding still needs to be determined infuture studies. Thus, both softwares can still be useful diagnostic tool for volumetric measurements.

Evaluation of linear measurements of implant sites based on head orientation during acquisition: An ex vivo study using cone-beam computed tomography

PURPOSE: This study evaluated the effect of various head orientations during cone-beam computed tomography (CBCT) image acquisition on linear measurements of potential implant sites. MATERIALS AND METHODS: Six dry human skulls with a total of 28 implant sites were evaluated for seven different head orientations. The scans were acquired using a Hitachi CB-MercuRay CBCT machine. The scanned volumes were reconstructed. Horizontal and vertical measurements were made and were compared to measurements made after simulating the head position to corrected head angulations. Data was analyzed using a two-way ANOVA test. RESULTS: Statistical analysis revealed a significant interaction between the mean errors in vertical measurements with a marked difference observed at the extension head position (P<0.05). Statistical analysis failed to yield any significant interaction between the mean errors in horizontal measurements at various head positions. CONCLUSION: Head orientation could significantly affect the vertical measurements in CBCT scans. The main head position influencing the measurements is extension.