Utility of dual-energy spectral CT and low-iodine contrast medium in DIEP angiography

2016 ◽  
Vol 70 (9B) ◽  
pp. B64-B71 ◽  
Author(s):  
Zhipeng Gao ◽  
Donghua Meng ◽  
Hong Lu ◽  
Bingyu Yao ◽  
Ning Huang ◽  
...  
Keyword(s):  
Contrast Medium ◽  
Dual Energy ◽  
Spectral Ct ◽  
Iodine Contrast Medium

scholarly journals Postablation assessment of hepatocellular carcinoma using dual-energy CT: Comparison of half versus standard iodine contrast medium

PLoS ONE ◽  
2019 ◽  
Vol 14 (7) ◽  
pp. e0219577
Author(s):  
Yuan-Mao Lin ◽  
Yi-You Chiou ◽  
Mei-Han Wu ◽  
Shan Su Huang ◽  
Shu-Huei Shen
Keyword(s):  
Hepatocellular Carcinoma ◽  
Contrast Medium ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Iodine Contrast Medium

Reducing contrast medium dose with low photon energy images in renal dual-energy spectral CT angiography and adaptive statistical iterative reconstruction (ASIR)

2021 ◽  
pp. 20200974
Author(s):  
Xirong Zhang ◽  
Jing Chen ◽  
Nan Yu ◽  
Zhanli Ren ◽  
Qian Tian ◽  
...  
Keyword(s):  
Renal Artery ◽  
Contrast Medium ◽  
Iterative Reconstruction ◽  
Dual Energy ◽  
Spectral Ct ◽  
Adaptive Statistical Iterative Reconstruction ◽  
Statistical Iterative Reconstruction ◽  
Group A ◽  
Group B ◽  
Medium Dose

Objective: To evaluate the value of using low energy (keV) images in renal dual-energy spectral CT angiography (CTA) and adaptive statistical iterative reconstruction (ASIR) to reduce contrast medium dose. Methods: 40 patients with renal CTA on a Discovery CT750HD were randomly divided into two groups: 20 cases (Group A) with 600 mgI kg−1 and 20 cases (Group B) with 300 mgI kg−1. The scan protocol for both groups was: dual-energy mode with mA selection for noise index of 10 HU, pitch 1.375:1, rotating speed 0.6 s/r. Images were reconstructed at 0.625 mm thickness with 40%ASIR, Group A used the conventional 70keV monochromatic images, and Group B used monochromatic images from 40 to 70 keV at 5 keV interval for analysis. The CT values and standard deviation (SD) values of the renal artery and erector spine in the plain and arterial phases were measured with the erector spine SD value representing image noise. The enhancement degree of the renal artery (ΔCT = CT(arterial) -CT(plain)), signal-to-noise ratio (SNR=CTrenal-artery/SDrenal-artery) and contrast-to-noise ratio (CNR=(CTrenal-artery-CTerector spine)/SDerector-spine) were calculated. The single factor analysis of variance was used to analyze the difference of ΔCT, SNR and CNR among image groups with p < 0.05 being statistically significant. The subjective image scores of the groups were assessed blindly by two experienced physicians using a 5-point system and the score consistency was compared by the κ test. Results: Contrast medium dose in the 300 mgI kg−1 group was reduced by 50% compared with the 600 mgI kg−1 group, while radiation dose was similar between the two groups. The subjective scores were 4.00 ± 0.65, 4.50 ± 0.60 and 3.70 ± 0.80 for images at 70 keV (600 mgI kg−1 group), 40 keV (300 mgI kg−1 group) and 45 keV (300 mgI kg−1 group), respectively with good consistency between the two reviewers (p > 0.05). The 40 keV images in the 300 mgI kg−1 group had similar ΔCT (469.77 ± 86.95 HU vs 398.54 ± 73.68 HU) and CNR (15.52 ± 3.32 vs 18.78 ± 6.71) values as the 70 keV images in the 600 mgI kg−1) group but higher SNR values (30.19 ± 4.41 vs 16.91 ± 11.12, p < 0,05) Conclusion: Contrast dose may be reduced by 50% while maintaining image quality by using lower energy images combined with ASIR in renal dual-energy CTA. Advances in knowledge: Combined with ASIR and energy spectrum, can reduce the amount of contrast dose in renal CTA.

scholarly journals The initial experience of the upper abdominal CT angiography using low-concentration contrast medium on dual energy spectral CT

2015 ◽  
Vol 40 (7) ◽  
pp. 2894-2899 ◽  
Author(s):  
Lei Xin ◽  
Xiaotang Yang ◽  
Ning Huang ◽  
Xiaosong Du ◽  
Jianxin Zhang ◽  
...  
Keyword(s):  
Contrast Medium ◽  
Ct Angiography ◽  
Dual Energy ◽  
Initial Experience ◽  
Spectral Ct ◽  
Abdominal Ct ◽  
Low Concentration ◽  
Upper Abdominal

scholarly journals Exploring the best monochromatic energy level in dual energy spectral imaging for coronary stents after percutaneous coronary intervention

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Qian Liu ◽  
Yajuan Wang ◽  
Haicheng Qi ◽  
Yaohui Yu ◽  
Yan Xing
Keyword(s):  
Percutaneous Coronary Intervention ◽  
Energy Level ◽  
Coronary Intervention ◽  
Dual Energy ◽  
Spectral Ct ◽  
Beam Hardening ◽  
Subjective Image Quality ◽  
Ct Value ◽  
Percutaneous Coronary

AbstractIn this study, the optimal monochromatic energy level in dual-energy spectral CT required for imaging coronary stents after percutaneous coronary intervention (PCI) was explored. Thirty-five consecutive patients after PCI were examined using the dual-energy spectral CT imaging mode. The original images were reconstructed at 40–140 keV (10-keV interval) monochromatic levels. The in-stent and out-stent CT values at each monochromatic level were measured to calculate the signal-to-noise ratio(SNR) and contrast-to-noise ratio (CNR) for the vessel and the CT value difference between the in-stent and out-stent lumen (dCT (in–out)), which reflects the artificial CT number increase due to the beam hardening effect caused by the stents. The subjective image quality of the stent and in-stent vessel was evaluated by two radiologists using a 5-point scale. With the increase in energy level, the CT value, SNR, CNR, and dCT (in–out) all decreased. At 80 keV, the mean CT value in-stent reached (345.24 ± 93.43) HU and dCT (in–out) started plateauing. In addition, the subjective image quality of the stents and vessels peaked at 80 keV. The 80 keV monochromatic images are optimal for imaging cardiac patients with stents after PCI, balancing the enhancement and SNR and CNR in the vessels while minimizing the beam hardening artifacts caused by the stents.

Dual energy spectral CT imaging for the evaluation of small hepatocellular carcinoma microvascular invasion

2017 ◽  
Vol 95 ◽  
pp. 222-227 ◽  
Author(s):  
Chuang-bo Yang ◽  
Shuang Zhang ◽  
Yong-jun Jia ◽  
Yong Yu ◽  
Hai-feng Duan ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Dual Energy ◽  
Ct Imaging ◽  
Microvascular Invasion ◽  
Small Hepatocellular Carcinoma ◽  
Spectral Ct

scholarly journals Nonlinear Image Blending for Dual-Energy MDCT of the Abdomen: Can Image Quality Be Preserved If the Contrast Medium Dose Is Reduced?

2014 ◽  
Vol 203 (4) ◽  
pp. 838-845 ◽  
Author(s):  
Achille Mileto ◽  
Juan Carlos Ramirez-Giraldo ◽  
Daniele Marin ◽  
Marcela Alfaro-Cordoba ◽  
Christian D. Eusemann ◽  
...  
Keyword(s):  
Image Quality ◽  
Contrast Medium ◽  
Dual Energy ◽  
Image Blending ◽  
Medium Dose

Dual energy spectral CT imaging of insulinoma—Value in preoperative diagnosis compared with conventional multi-detector CT

2012 ◽  
Vol 81 (10) ◽  
pp. 2487-2494 ◽  
Author(s):  
Xiao Zhu Lin ◽  
Zhi Yuan Wu ◽  
Ran Tao ◽  
Yan Guo ◽  
Jian Ying Li ◽  
...  
Keyword(s):  
Preoperative Diagnosis ◽  
Dual Energy ◽  
Ct Imaging ◽  
Spectral Ct
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