Comparison of the Quality of Various Polychromatic and Monochromatic Dual-Energy CT Images with or without a Metal Artifact Reduction Algorithm to Evaluate Total Knee Arthropasty

被引:9
作者
Choo, Hye Jung [1 ]
Lee, Sun Joo [1 ]
Kim, Dong Wook [1 ]
Lee, Yoo Jin [1 ]
Baek, Jin Wook [1 ]
Han, Ji-yeon [1 ]
Heo, Young Jin [1 ]
机构
[1] Inje Univ, Dept Radiol, Busan Paik Hosp, 75 Bokji Ro, Busan 47392, South Korea
关键词
Dual-energy CT; Total knee arthroplasty; Prosthesis; Metal artifact reduction; Virtual monochromatic imaging; COMPUTED-TOMOGRAPHY; FUSION;
D O I
10.3348/kjr.2020.0548
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Objective: To compare the quality of various polychromatic and monochromatic images with or without using an iterative metal artifact reduction algorithm (iMAR) obtained from a dual-energy computed tomography (CT) to evaluate total knee arthroplasty. Materials and Methods: We included 58 patients (28 mate and 30 female; mean age [range], 71.4 [61-83] years) who underwent 74 knee examinations after total knee arthroplasty using dual-energy CT. CT image sets consisted of polychromatic image sets that linearly blended 80 kVp and tin-filtered 140 kVp using weighting factors of 0.4, 0, and -0.3, and monochromatic images at 130, 150, 170, and 190 keV. These image sets were obtained with and without applying iMAR, creating a total of 14 image sets. Two readers qualitatively ranked the image quality (1 [lowest quality] through 14 [highest quality]). Volumes of high- and low-density artifacts and contrast-to-noise ratios (CNRs) between the bone and fat tissue were quantitatively measured in a subset of 25 knees unaffected by metal artifacts. Results: iMAR-applied, polychromatic images using weighting factors of -0.3 and 0.0 (P--0(.3i) and P-0.0i, respectively) showed the highest image-quality rank scores (median of 14 for both by one reader and 13 and 14, respectively, by the other reader; p < 0.001). All iMAR-applied image series showed higher rank scores than the iMAR-unapplied ones. The smallest volumes of low-density artifacts were found in P--0(.3i), P-0.0i, and iMAR-applied monochromatic images at 130 keV. The smallest volumes of high-density artifacts were noted in P--0(.3i). The CNRs were best in polychromatic images using a weighting factor of 0.4 with or without iMAR application, followed by polychromatic images using a weighting factor of 0.0 with or without iMAR application. Conclusion: Polychromatic images combined with iMAR application, P--0(.3i) and P-0 .0i, provided better image qualities and substantial metal artifact reduction compared with other image sets.
引用
收藏
页码:1341 / 1351
页数:11
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