Images Analysis of Superior Mesenteric Artery and Vein Based on Spectral CT Optimal Monochromatic Imaging Combined with Adaptive Statistical Iterative Reconstruction
Pages: 889-894
Year: 2017 Issue: 6
Journal: Journal of Clinical Radiology
Abstract: Objective To investigate the improvement effect of the optimal monochromatic parameters combined with adaptive statistical iterative reconstruction (ASIR) on the image quality of superior mesenteric artery (SMA) and superior mesenteric vein(SMV) using energy spectral CT.Methods 25 patients with abdominal disease using the GSI technique were analyzed retrospectively.The optimal monochromatic set was selected for obtaining the best contrast to noise ratio (CNR) for SMA and SMV.The monochromatic images of SMA and SMV were reconstructed by 70 keV,optimal monochromatic and optimal monochromatic + 40％ ASIR mode,respectively.Comparative parameters including CT value,backgnud noises (SDn),backgroud CT value(CTB),contrast-to-noise ratio(CNR),signal-to-noise ratio(SNR) and subjective scores of the SMA and SMV.Two-way ANOVA was used for statistical analysis.Results The optimal monochromatic images of the SMA and SMV were about 60 keV (ranged from 55 keV to 62 keV).CNR of the optimal monochromatic group(60 keV),the 70 keV group,and the optimal monochromatic(60 keV) +40％ ASIR group of SMA were20.41 ± 7.66,17.16 ± 6.79,22.85 ± 8.24,respectively,Subjective scores were 4.24 ± 0.35,3.86 ± 0.19 and 4.25 ± 0.36,respectively.CNR in SMV were 5.80 ± 1.99,4.37 ± 1.22 and 7.27 ± 2.51,respectively,Subjective scores were 3.78 ± 0.35,3.46 ± O.27 and 3.81 ±0.32,respectively.CNR and subjective scores had significant difference among the groups(P ＜ 0.05).CNR and SNR of SMA and SMV in 60 key + 40％ ASIR group were superior to those in the 70 keV and 60 keVgroup.Subjective scores of SMA and SMV in 60keV + 40％ ASIR group were superior to those in the 70 keV group(P ＜ 0.05),had no significant difference with 60 keV group.Conclusion Cmpared with 70 keV and 60keV imaging,the optimal monochromatic (60 keV) + 40％ ASIR imaging could significantly improve the image quality of SMA and SMV and be widely used in clinic.
Year: 2017 Issue: 6
Journal: Journal of Clinical Radiology
Abstract: Objective To investigate the improvement effect of the optimal monochromatic parameters combined with adaptive statistical iterative reconstruction (ASIR) on the image quality of superior mesenteric artery (SMA) and superior mesenteric vein(SMV) using energy spectral CT.Methods 25 patients with abdominal disease using the GSI technique were analyzed retrospectively.The optimal monochromatic set was selected for obtaining the best contrast to noise ratio (CNR) for SMA and SMV.The monochromatic images of SMA and SMV were reconstructed by 70 keV,optimal monochromatic and optimal monochromatic + 40％ ASIR mode,respectively.Comparative parameters including CT value,backgnud noises (SDn),backgroud CT value(CTB),contrast-to-noise ratio(CNR),signal-to-noise ratio(SNR) and subjective scores of the SMA and SMV.Two-way ANOVA was used for statistical analysis.Results The optimal monochromatic images of the SMA and SMV were about 60 keV (ranged from 55 keV to 62 keV).CNR of the optimal monochromatic group(60 keV),the 70 keV group,and the optimal monochromatic(60 keV) +40％ ASIR group of SMA were20.41 ± 7.66,17.16 ± 6.79,22.85 ± 8.24,respectively,Subjective scores were 4.24 ± 0.35,3.86 ± 0.19 and 4.25 ± 0.36,respectively.CNR in SMV were 5.80 ± 1.99,4.37 ± 1.22 and 7.27 ± 2.51,respectively,Subjective scores were 3.78 ± 0.35,3.46 ± O.27 and 3.81 ±0.32,respectively.CNR and subjective scores had significant difference among the groups(P ＜ 0.05).CNR and SNR of SMA and SMV in 60 key + 40％ ASIR group were superior to those in the 70 keV and 60 keVgroup.Subjective scores of SMA and SMV in 60keV + 40％ ASIR group were superior to those in the 70 keV group(P ＜ 0.05),had no significant difference with 60 keV group.Conclusion Cmpared with 70 keV and 60keV imaging,the optimal monochromatic (60 keV) + 40％ ASIR imaging could significantly improve the image quality of SMA and SMV and be widely used in clinic.
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