scholarly journals Metal Artifact Reduction in Cone-Beam Computed Tomography for Head and Neck Radiotherapy

2016 ◽  
Vol 15 (6) ◽  
pp. NP88-NP94 ◽  
Author(s):  
Mark Korpics ◽  
Paul Johnson ◽  
Rakesh Patel ◽  
Murat Surucu ◽  
Mehee Choi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Head And Neck ◽  
Cone Beam Computed Tomography ◽  
Regions Of Interest ◽  
Cone Beam ◽  
Artifact Reduction ◽  
Metal Artifacts ◽  
Dental Fillings ◽  
Computed Tomography Images ◽  
Streak Artifacts

Purpose: To evaluate a method for reducing metal artifacts, arising from dental fillings, on cone-beam computed tomography images. Materials and Methods: A projection interpolation algorithm is applied to cone-beam computed tomography images containing metal artifacts from dental fillings. This technique involves identifying metal regions in individual cone-beam computed tomography projections and interpolating the surrounding values to remove the metal from the projection data. Axial cone-beam computed tomography images are then reconstructed, resulting in a reduction in the streak artifacts produced by the metal. Both phantom and patient imaging data are used to evaluate this technique. Results: The interpolation substitution technique successfully reduced metal artifacts in all cases. Corrected images had fewer or no streak artifacts compared to their noncorrected counterparts. Quantitatively, regions of interest containing the artifacts showed reduced variance in the corrected images versus the uncorrected images. Average pixel values in regions of interest around the metal object were also closer in value to nonmetal regions after artifact reduction. Artifact correction tended to perform better on patient images with less complex metal objects versus those with multiple large dental fillings. Conclusion: The interpolation substitution is potentially an efficient and effective technique for reducing metal artifacts caused by dental fillings on cone-beam computed tomography image. This technique may be effective in reducing such artifacts in patients with head and neck cancer receiving daily image-guided radiotherapy.

Quantification of metal artifacts on cone beam computed tomography images

2011 ◽  
Vol 24 ◽  
pp. 94-99 ◽  
Author(s):  
Ruben Pauwels ◽  
Harry Stamatakis ◽  
Hilde Bosmans ◽  
Ria Bogaerts ◽  
Reinhilde Jacobs ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Metal Artifacts ◽  
Computed Tomography Images

scholarly journals Incidental Findings on Cone Beam Computed Tomography Images

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Veeratrishul Allareddy ◽  
Steven D. Vincent ◽  
John W. Hellstein ◽  
Fang Qian ◽  
Wendy R. K. Smoker ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Incidental Findings ◽  
Regions Of Interest ◽  
Cone Beam ◽  
Anatomical Structures ◽  
Area Of Interest ◽  
Computed Tomography Images ◽  
Computed Tomography Scans ◽  
Areas Of Interest

Background. Cone beam computed tomography (CBCT) has gained widespread acceptance in dentistry for a variety of applications. Most dentists who are not radiologists/trained in radiology are generally not familiar with interpretation of anatomical structures and/or pathosis outside their area of primary interest, as often this was not within the scope of their training.Objectives. To assess that the number of incidental findings on a CBCT scan is high both within and outside of the primary area of interest, thereby emphasizing the importance of interpretation of all areas visualized on the scan.Materials and Methods. An oral and maxillofacial radiologist reviewed 1000 CBCT scans (382 males and 618 females) for findings both in- and outside the area of interest.Results. Of the 1000 subjects that were reviewed, 943 scans showed findings in the primary regions of interest and/or outside the regions of interest, and 76 different conditions were visualized in these scans both in and outside the areas of interest.Conclusion. From the wide scope of findings noted on these scans, it can be concluded that it is essential that a person trained in advanced interpretation techniques in radiology interprets cone beam computed tomography scans.

Sign in / Sign up

Export Citation Format

Share Document