Evaluation of streak metal artifacts in cone beam computed tomography by using the Gumbel distribution: a phantom study.

Yoshikazu Nomura, Hiroshi Watanabe, Nisha Gowri Manila, Sakurako Asai, Tohru Kurabayashi

Oral surgery, oral medicine, oral pathology and oral radiology 2021 Apr

filter terms:

The aim of this study was to confirm whether streak metal artifacts (SMAs) between titanium implants on cone beam computed tomography (CBCT) images could be evaluated by using the Gumbel distribution (GD). Moreover, the influence of different scan settings on SMAs was investigated. An iodine solution simulating dentin was placed between 2 titanium rods in an acrylic phantom. It was scanned by using CBCT at 2 settings with nearly equivalent exposure doses (90 kV, 7 mA; 78 kV, 10 mA). The images were analyzed, and the dependence of the voxel values in SMAs on GD was investigated with the coefficient of determination (r2). The location parameters, indicating the strength of the SMAs, were calculated for each scan setting and evaluated with the Mann-Whitney U test. Significance was established at p = .05. The SMAs on CBCT images depended on GD (r2 ≥ .959). The SMAs with the 78 kV, 10 mA settings were significantly smaller than those with the 90 kV, 7 mA settings (p < .01). SMAs on CBCT images could be evaluated by using methods based on GD. The strengths of metal artifacts varied with changes in scan settings, even at nearly equivalent exposure doses. Copyright © 2020 Elsevier Inc. All rights reserved.

Citation

Yoshikazu Nomura, Hiroshi Watanabe, Nisha Gowri Manila, Sakurako Asai, Tohru Kurabayashi. Evaluation of streak metal artifacts in cone beam computed tomography by using the Gumbel distribution: a phantom study. Oral surgery, oral medicine, oral pathology and oral radiology. 2021 Apr;131(4):494-502