Metal artifact production and reduction in CBCT with different numbers of basis images
Queiroz Polyane Mazucatto, Santaella Gustavo Machado, Groppo Francisco Carlos, Freitas Deborah Queiroz,
소속 상세정보
( Queiroz Polyane Mazucatto ) - University of Campinas Piracicaba Dental School Department of Oral Diagnosis
( Santaella Gustavo Machado ) - University of Campinas Piracicaba Dental School Department of Oral Diagnosis
( Groppo Francisco Carlos ) - University of Campinas Piracicaba Dental School Department of Physiological Sciences
( Freitas Deborah Queiroz ) - University of Campinas Piracicaba Dental School Department of Oral Diagnosis
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.
키워드
Cone-Beam Computed Tomography; Artifacts; Phantoms; Imaging
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