Dual-Energy Spectral Computed Tomography With Adaptive Statistical Iterative Reconstruction for Improving Image Quality of Portal Venography. Issue 6 (November 2018)

• Record Type: Journal Article
• Authors: Wang, Weibing; Huang, Jinbai; Wang, Ai; Li, Yun; Peng, Jie; Hu, Xinjie; Liu, Yingjun; Zhang, Haiyan; Li, Xiaohu
• Is Part Of: Journal of computer assisted tomography. Volume 42:Issue 6(2018)
• Publication Date: 2018-11
• Subjects: dual-energy computed tomography -- spectral computed tomography -- adaptive statistical iterative reconstruction -- computed tomography portal venography -- imaging quality; Tomography -- Periodicals; Tomography -- Periodicals; Tomography; Periodicals; 616.0757
• DOI: 10.1097/RCT.0000000000000785
• Languages: English
• ISSNs: 0363-8715

Abstract

Abstract : Objective: The aim of the study was to investigate whether spectral computed tomography (CT) plus adaptive statistical iterative reconstruction (ASIR) could improve imaging quality of computed tomography portal venography (CTPV). Methods: Sixty-four patients underwent CTPV, with CT number of portal vein (PV) less than 150 HU in portal phase, were divided into 2 groups A (n = 31), using standard 120-kVp protocol. group B (n = 33), using spectral CT protocol. Standard 120-kVp images were reconstructed with 40% ASIR, and monochromatic images at 60 keV were reconstructed with the following 4 ASIR percentages: 0%, 20%, 40%, and 60%. The CT number, image noise, and contrast-to-noise ratio in main PV were measured. The maximum intensity projection and volume-rendering images were used for subjective evaluation. These 2 kinds of results were statistically analyzed. Results: The contrast-to-noise ratio and subjective scoring of PV increased gradually from 120-kVp images to 60% weight ASIR (3.44 ± 0.95, 4.58 ± 1. 59, 5.26 ± 1.85, 6.18 ± 2.18, and 7.39 ± 2.65 and 4.35 ± 1.17, 6.21 ± 1.29, 6.48 ± 1.35, 6.85 ± 1.28, and 7.00 ± 1.19). There were statistically different for the 5 groups ( P < 0.001). The CT number of the PV in the 60-kiloelectron volt spectral images had higher than the 120-kVp images ( P < 0.001). The noise of 120 kVp was significantly higher than those of 60% ASIR and significantly lower than those of 0% ASIR (both P < 0.001), and there were no significant differences between 120-kVp, 20% ASIR, and 40% ASIR ( P = 0.107 and 1.000, respectively). The diagnostic acceptability was highest at 40% ASIR. Conclusions: Forty-percent ASIR addition to the 60-kiloelectron volt monochromatic image could improve image quality of CTPV comparing with conventional 120-kVp images.