• Submission Form (PDF)
• Author Guidelines (PDF)
• Submit

• Accepted Manuscripts

Back

Volume 27 , Issue 6
November/December 2012
Pages 1438-1442

Reliability of Voxel Gray Values in Cone Beam Computed Tomography for Preoperative Implant Planning Assessment

Azin Parsa, DDS, MSc/Norliza Ibrahim, DDS, MSc/Bassam Hassan, BDS, MSc, PhD/Alessandro Motroni, MS/Paul van der Stelt, DDS, PhD/Daniel Wismeijer, DDS, PhD

PMID: 23189294

Purpose: To assess the reliability of cone beam computed tomography (CBCT) voxel gray value measurements using Hounsfield units (HU) derived from multislice computed tomography (MSCT) as a clinical reference (gold standard). Materials and Methods: Ten partially edentulous human mandibular cadavers were scanned by two types of computed tomography (CT) modalities: multislice CT and cone beam CT. On MSCT scans, eight regions of interest (ROI) designating the site for preoperative implant placement were selected in each mandible. The datasets from both CT systems were matched using a three-dimensional (3D) registration algorithm. The mean voxel gray values of the region around the implant sites were compared between MSCT and CBCT. Results: Significant differences between the mean gray values obtained by CBCT and HU by MSCT were found. In all the selected ROIs, CBCT showed higher mean values than MSCT. A strong correlation (R = 0.968) between mean voxel gray values of CBCT and mean HU of MSCT was determined. Conclusions: Voxel gray values from CBCT deviate from actual HU units. However, a strong linear correlation exists, which may permit deriving actual HU units from CBCT using linear regression models. Int J Oral Maxillofac Implants 2012;27:1438–1442

Key words: accuracy, CBCT, cone beam computed tomography, Hounsfield unit

Full Text PDF File | Order Article

 

 

Adobe Acrobat Reader is required to view PDF files. This is a free program available from the Adobe web site.
Follow the download directions on the Adobe web site to get your copy of Adobe Acrobat Reader.