Effect of Reconstruction Technique for Metal Artifact Reduction in Computed Tomography by Changing Display Field of View

Nakamura Shinobu, Kawata Hidemichi, Kuroki Hidefumi, Mizoguchi Asumi

doi:10.6009/jjrt.2015_jsrt_71.11.1096

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金属アーチファクト低減再構成技術におけるdisplay field of view(DFOV)の影響について
臨床技術金属アーチファクト低減再構成技術におけるdisplay field of view(DFOV)の影響について
リンショウギジュツキンゾクアーチファクトテイゲンサイコウセイギジュツニオケル display field of view(DFOV)ノエイキョウニツイテ

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Abstract

We evaluated the effect of orthopedic-metal artifact reduction (O-MAR) for metal artifact in computed tomography with 73 simulated seeds for brachytherapy in different sizes of display field of view (DFOV) obtained by helical scan under the same clinical scan condition. The metal artifacts were analyzed with the Gumbel's method by changing DFOV sizes 80 mm, 160 mm, and 320 mm. Gumbel distribution, scale parameter (γ), and location parameter (β) of the metal artifacts with O-MARwere compared with that of the metal artifacts with filtered back projection (FBP). In conclusion, it was considered that the effect of metal artifact reduction with O-MARwas influenced by DFOV size in this study. The reduction rates of scale parameter (γ) were 22.3%, 21.3%, and 10.0% in DFOV 80 mm, 160 mm, and 320 mm, respectively. The reduction rates of location parameter (β) were 27.4%, 23.4 %, and 9.8%. Therefore, the effect of metal artifact reduction with O-MARshowed the tendency of increasing with decreasing DFOV size.

Journal

Japanese Journal of Radiological Technology

Japanese Journal of Radiological Technology 71 (11), 1096-1102, 2015

Japanese Society of Radiological Technology

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