Wanjun Shuai

Chinese PLA General Hospital (301 Hospital), Peping, Beijing, China

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Publications (13)14.6 Total impact

  • Wanjun Shuai · Yong Chao · Yuxin Li · Xiaoning Lv · Yao Li · Quanliang Dong · Le Sun
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    ABSTRACT: To improve the usage rate and quality of emergency equipments in the hospital, the emergency equipment management was studied. The specialized management and common use of emergency equipments in a hospital was analysed with statistical methods. The usage rate, economic effectiveness and management quality of the equipments were evaluated. Based on the practical experience, the superiorities of the specialized management and common use of emergency equipments in hospitals were summarized, and the inferior positions and their improvement approaches were proposed. As a result, the hospital resource allocation was optimized and the equipments management level was improved by using the specialized management and common use of emergency equipments in the hospital.
    No preview · Article · Nov 2013 · Zhongguo yi liao qi xie za zhi = Chinese journal of medical instrumentation
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    Full-text · Article · Mar 2013 · Intensive Care Medicine
  • Wanjun Shuai · Xiuzhen Dong · Xiaoning Lv · Yong Chao
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    ABSTRACT: Three algorithms of electrical impedance tomography (EIT) are studied in this paper. The image resolution, anti-noise property and computation rapidity of the reconstruction algorithms are compared. As a result, it shows that back-projection algorithm has good anti-noise property, that NOSER algorithm generates images with good resolution, and that sensitivity matrix algorithm has moderate property.
    No preview · Article · Jan 2012 · Zhongguo yi liao qi xie za zhi = Chinese journal of medical instrumentation
  • Wanjun Shuai · Yong Chao · Ning Wang · Shining Xu
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    ABSTRACT: Clinical experiments are always used to evaluate the safety and validity of medical devices. The experiments have two types of clinical trying and testing. Ethic review must be done by the ethics committee of the medical department with the qualification of clinical research, and the approval must be made before the experiments. In order to ensure the safety and validity of clinical experiments of medical devices in medical institutions, the contents, process and approval criterions of the ethic review were analyzed and discussed.
    No preview · Article · Jul 2011 · Zhongguo yi liao qi xie za zhi = Chinese journal of medical instrumentation
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    ABSTRACT: Retroperitoneal bleeding is commonly associated with blunt trauma to the abdomen. Current medical tools cannot be used for continuous monitoring of the bleeding. In the study, electrical impedance tomography (EIT) was applied to monitoring the retroperitoneal bleeding of an animal model. Six healthy swine were used. The process of retroperitoneal bleeding was simulated by the continuous injection of anticoagulated blood. For each subject, total blood of 200 mL or more was injected within different time periods ranging from tens of minutes to two hours. The bleeding was detected and monitored continuously by EIT system with 16 electrodes at a rate of one image per second. EIT images were reconstructed by dynamic back-projection algorithm. Mean resistivity value (MRV) of the bleeding region in EIT images was calculated and plotted over time. We found that impedance changes caused by the bleeding could be revealed by EIT images and MRV curves. MRV curve varied approximately linearly with the quantity of blood injected using regression analysis (R 2 = 0.90 to 0.99, p < 0.05). In total, 20 mL of blood volume changes could be identified by EIT. The progression of the retroperitoneal bleeding can be monitored by EIT in the proposed animal model. It suggests EIT is potential as a useful tool for continuous monitoring of retroperitoneal bleeding after blunt trauma.
    Preview · Article · Sep 2009 · Annals of Biomedical Engineering
  • Wei Zhang · Hongyi Zhang · Tingyi Bao · Fusheng You · Wanjun Shuai
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    ABSTRACT: Piglets having each a body weight of 20-30 kg and an abdominal perimeter like human's were used in the experiment. Being guided by ultrasound, we stabbed the piglet's abdomen, placed a catheter on the liver's lower margin, then injected the anticoagulated blood through the catheter by electrical infusion pump with constant speed respectively, and monitored the whole process by EIT. We observed the image change, using Ultrasound and CT to examine the area of blood injection after the end of monitoring,and we dissected to check the result of observations. The results reveal: (1) Ultrasound, CT and dissection are all able to find out a large amount of blood in piglet's abdominal cavity; (2) The pixel value of EIT target area decreases with the increase of blood, and the change in impedance image can be obviously observed. Therefore, this animal model is suitable for simulating intraperitoneal bleeding, and the speed of bleeding therein can be controlled. We can get a limpid image when EIT is used for monitoring the intraperitoneal bleeding simulated by this animal model.
    No preview · Article · Mar 2009 · Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi
  • F. You · W. Shuai · X. Shi · F. Fu · R. Liu · X. Dong
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    ABSTRACT: Many reasons, such as traffic accident, abdomen post-operation, etc., may cause intraperitoneal bleeding. To further demonstrate the feasibility of non-invasive monitoring of EIT for intraperitoneal bleeding, pig's bleeding model of liver injury was made. The pig's liver was hurt by puncture needle manually so that the internal autobleeding process is continuous and nature, which resembles the clinical bleeding process of abdominal organ injuries. Totally 5 cases of 3 month old pig's bleeding of liver injury were monitored by EIT. In the experiments, 16 electrodes were placed around the skin-prepared abdomen, an alternating current (1mA, 50KHz) was applied on polar driven pattern, and the improved back-projection algorithm was used for image reconstruction. The EIT system imaged at 1 frame per second. The monitor time lasted about 40~120 minutes till the subject was dying or dead of hemorrhoea. After paunching each pig, the total bleeding volume was measured and it ranged from 450~870ml. The imaging results show that after liver injury, the bleeding area in EIT images become redder and larger gradually with the bleeding process going on, indicating EIT could monitor the development of the pig's liver bleeding dynamically and non-invasively.
    No preview · Article · Jan 2009 · IFMBE proceedings
  • W. Shuai · X. Shi · F. You · F. Fu · R. Liu · X. Dong
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    ABSTRACT: To choose a better current excitation method for electrical impedance tomography (EIT) in practical applications, polar excitation, a method of single current excitation with pairs of electrodes in opposite position, was studied. Combined with back-projection algorithm of EIT, a comparative study was made on the polar excitation and traditional adjacent excitation through computer simulation, phantom experiments and animal experiments. The image quality, location accuracy and reconstruction error were all analyzed and studied. Results show that the impedance imaging based on polar excitation has a good ability of anti-noise in comparison with that on adjacent excitation. Polar excitation, therefore, is more appropriate for practical applications of EIT in clinical noisy environment.
    No preview · Article · Nov 2008
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    ABSTRACT: Electrical impedance tomography (EIT) estimated the electrical conductivity distribution within a body. Bipolar drive pattern appeared in most EIT studies that the current was injected with a single current source and sink. In the present study, we built a computational phantom and compared the quality of dynamic EIT image in terms of data quality, resolution and anti-noise performance associated with three different bipolar drive patterns: polar drive pattern, pseudo-polar drive pattern and adjacent drive pattern. The results demonstrated that the pseudo-polar drive pattern is optimal.
    No preview · Conference Paper · Jun 2008
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    ABSTRACT: We proposed a new method based on total relative change (TRC) from measured boundary voltages to quantify the volume changes of fluid during electrical impedance tomography (EIT) monitoring. The results showed that TRC linearly correlated with the volume of infused saline solution into a phantom, and the slope of TRC changes was approximately linear with the infusion speed. A inserted copper tube at different positions did not affect TRC significantly. The linear relationship between TRC and volume change indicates that TRC could be a good quantitative index for dynamic EIT.
    No preview · Article · Apr 2008 · IEEE Transactions on Biomedical Engineering
  • Fusheng You · Wanjun Shuai · Xuetao Shi · Feng Fu · Ruigang Liu · Xiuzhen Dong
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    ABSTRACT: To investigate continuous monitoring capacity of electrical impedance tomography (EIT) for retroperitoneal bleeding, studies were carried out on six anesthetized piglet's bleeding model produced by injecting anticoagulated blood into renal region. For each subject, total blood of about 200 ml was injected within time periods ranging from tens of minutes to several hours. The simulated bleeding processes were detected and monitored by EIT system with sixteen electrodes at a rate of one image per second. EIT images were reconstructed by dynamic back-projection algorithm. The results showed that impedance changes caused by bleeding could be revealed by EIT images.
    No preview · Article · Feb 2008 · Conference proceedings: ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference
  • Xuetao Shi · Xiuzhen Dong · Wanjun Shuai · Fusheng You · Feng Fu · Ruigang Liu
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    ABSTRACT: Brain electrical impedance tomography (EIT) is a difficult task as brain tissues are enclosed by the skull of high resistance and cerebrospinal fluid (CSF) of low resistance, which makes internal resistivity information more difficult to extract. In order to seek a single source drive pattern that is more suitable for brain EIT, we built a more realistic experimental setting that simulates a head with the resistivity of the scalp, skull, CSF and brain, and compared the performance of adjacent, cross, polar and pseudo-polar drive patterns in terms of the boundary voltage dynamic range, independent measurement number, total boundary voltage changes and anti-noise performance based on it. The results demonstrate that the pseudo-polar drive pattern is optimal in all the aspects except for the dynamic range. The polar and cross drive patterns come next, and the adjacent drive pattern is the worst. Therefore, the pseudo-polar drive pattern should be chosen for brain EIT.
    No preview · Article · Dec 2006 · Physiological Measurement
  • Wanjun Shuai · Xiuzhen Dong · Feng Fu · Fusheng You · Ruigang Liu · Xuetao Shi
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    ABSTRACT: The contour line of human brain was simulated by the curve-fitting methods and then the inner area was discretized by advancing-front methods which was improved at last. The curve-fitting result was similar to the CT picture of the human brain and the discrete result of inner area could be completed quickly by improved advanced-front methods. A finite element model with the contour line of human brain was built primarily which will contribute to the next algorithm study of electrical impedance tomography in human brain.
    No preview · Article · Sep 2005 · Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi