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KMID : 1149020180200020115
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Journal of Korean Society of Computed Tomographic Technology
2018 Volume.20 No. 2 p.115 ~ p.122
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The Usefulness of Metal Artifact Reduction by Dental Implant in Neck CT
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Oh Young-Hye
Jung Jae-Yeon
Im Sang-Muk
Oh Geun-Taek
Lee Kwang-Won
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Abstract
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Purpose: The dental implants have metal artifact and are interfered with the images in neck CT. The purpose of this study was to investigate how to reduce metal artifact with dental implants in neck CT using dual energy CT.
Material and methods: From October to December 2017, this study included 10 patients with Neck CT who had dental implants. After dual-energy CT scan, monoenergetic software was used to postprocess with the following ten photon energies: 70 kiloelectron-voltage (keV), 75 keV, 80 keV, 85 keV, 90 keV, 100 keV, 110 keV, 120keV, 130keV and 150keV. We performed a quantitative evaluation of HU mean and SD values with reformatted images. And two radiologists and three radio technologists performed a qualitative evaluation on a scale of 5 points.
Result: In virtual mono energetic imge of dual energy CT, as the keV increases, the mean value of HU decreases, the noise value increases, and the p value becomes statistically significant(p=0.01). The results of qualitative evaluation, the images of 110 keV above showed a great effect on reduction of metal artifact, but they were evaluated as inappropriate images for proper image quality evaluation items. The appropriate image quality energy was 80 ~ 85 keV.
Conclusion: Compared with single energy CT image, the virtual monoenergetic images of dual energy CT improved quality of CT images and reduced the metal artifact in neck CT with dental implats. Reformatted images at 80~85 keV have the optimal quality and are useful.
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KEYWORD
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Neck CT, Metal artifact, Dual energy
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