Imaging Science in Dentistry

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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Metal artifact production and reduction in CBCT with different numbers of basis images

  • Queiroz, Polyane Mazucatto (Department of Oral Diagnosis, Area of Oral Radiology, Piracicaba Dental School, University of Campinas) ;
  • Santaella, Gustavo Machado (Department of Oral Diagnosis, Area of Oral Radiology, Piracicaba Dental School, University of Campinas) ;
  • Groppo, Francisco Carlos (Department of Physiological Sciences, Area of Pharmacology, Piracicaba Dental School, University of Campinas) ;
  • Freitas, Deborah Queiroz (Department of Oral Diagnosis, Area of Oral Radiology, Piracicaba Dental School, University of Campinas)
  • Received : 2017.10.16
  • Accepted : 2018.01.31
  • Published : 2018.03.31
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Abstract

Purpose: To evaluate the effect of different numbers of basis images and the use of metal artifact reduction (MAR) on the production and reduction of artifacts in cone-beam computed tomography images. Materials and Methods: An acrylic resin phantom with a metal alloy sample was scanned, with 450 or 720 basis images and with or without MAR. Standard deviation values for the test areas (around the metal object) were obtained as a way of measuring artifact production. Two-way analysis of variance was used with a 5% significance level. Results: There was no significant difference in artifact production among the images obtained with different numbers of basis images without MAR (P=.985). MAR significantly reduced artifact production in the test areas only in the protocol using 720 basis images (P=.017). The protocol using 450 basis images with MAR showed no significant difference in artifact production when compared to the protocol using 720 basis images with MAR (P=.579). Conclusion: Protocols with a smaller number of basis images and with MAR activated are preferable for minimizing artifact production in tomographic images without exposing the patient to a greater radiation dose.

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References

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