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1. Excavation Method of Reducing Blasting Vibration in Complicated Geological Conditions

Author

Lixiang Xie, Wenbo Lu, Jincai Gu, and Gaohui Wang

Subjects
Physics, QC1-999
Abstract

Drilling and blasting method as a common excavation method is widely used in the underground engineering construction. However, in the complicated geological conditions, the path of blasting excavation available has limitation, and then the larger blasting vibration is produced, which influence the stability and safety of the protected structure. To effectively reduce the blasting vibration by optimizing the blasting excavation method, firstly, the site test on blasting vibration is conducted to obtain the blasting vibration data; secondly, the LS-DYNA software is applied to simulate the vibration generated by blasting in site test, based on back analysis on the blasting vibration, the mechanical parameters of the rock mass are obtained, and they are used to simulate six different types of blasting excavation method. According to the analysis on them, the reasonable blasting excavation method is proposed to reduce the blasting vibration which can satisfy the blasting safety regulation.

Published
2018
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2. Comparison of 3.0T MRI with 3D LAVA sequence and digital subtraction angiography for the assessment of accessory hepatic veins in Budd-Chiari syndrome

Author

Huiting Xu, Lixiang Xie, Yutao Rong, Yue Dai, Li Lu, Shaodong Li, Chao Xu, Cuiping Han, and Kai Xu

Subjects
medicine.medical_specialty, medicine.diagnostic_test, business.industry, Magnetic resonance imaging, Digital subtraction angiography, Image enhancement, medicine.disease, Inferior vena cava, Magnetic resonance angiography, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, medicine.vein, Hepatic veins, Budd–Chiari syndrome, Medicine, 030211 gastroenterology & hepatology, Radiology, Nuclear Medicine and imaging, Radiology, business, Mri findings
Abstract

Purpose To compare 3D liver acceleration volume acquisition (LAVA) and digital subtraction angiography (DSA) for evaluating the presence of accessory hepatic veins (AHV) in Budd-Chiari syndrome (BCS). Materials and Methods This was a retrospective study in 228 patients with BCS who underwent 3.0T magnetic resonance imaging (MRI) with the 3D LAVA sequence. Two reviewers noted AHV: openings located in the inferior vena cava (IVC), caliber, and the angle of entering into the IVC. MRI results were compared to DSA. Kappa statistics were calculated to quantify intrareader variability in detecting AHVs. Results On MRI, 63 patients demonstrated no AHV on LAVA images, 70 had one AHV, 62 had two AHVs, 26 patients had three AHVs, six patients had four AHVs, and one patient had five AHVs (P < 0.05 vs. DSA). The mean caliber of the AHVs was 8.3 ± 4.0 mm compared to 9.9 ± 3.2 for DSA (P < 0.001). Among the 301 AHVs, there were 140 with acute angles (46.5%), 71 with right angles (23.6%), and 90 with obtuse angles (29.8%). The prevalence of AHVs on DSA was 54.8% (125/228), while MRI demonstrated 301 AHVs in 165 patients, for a prevalence of 72.4% (165/228) compared to 54.8% for DSA (P = 0.001). The two methods were concordant in only 116/228 (50.9%) patients. The kappa coefficient demonstrated good intrareader consistency for all documented MRI findings of AHVs (κ = 0.626 for caliber and κ = 0.65 for angles). Conclusion More AHVs were visible on MRI LAVA sequences than on conventional DSA. Level of Evidence: 4 J. Magn. Reson. Imaging 2017;45:401–409.

Published
2016
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