目的分析摄影设备、焦距及重建软件中重建质量的选择等因素对单相机摄影测量法重构结果的影响,为单相机摄影测量法的法医学应用提供参考。方法采用传统测量法和单相机摄影测量法分别测量19个颅骨,分析两种测量法的差异及相同摄影设备不...目的分析摄影设备、焦距及重建软件中重建质量的选择等因素对单相机摄影测量法重构结果的影响,为单相机摄影测量法的法医学应用提供参考。方法采用传统测量法和单相机摄影测量法分别测量19个颅骨,分析两种测量法的差异及相同摄影设备不同焦距组的组内差异。以1例颅骨和1具尸体为研究对象,根据摄影测量软件中重建质量分为5个等级,以光学扫描重构模型为参考模型,单相机摄影测量法重构模型为测试模型,最佳拟合对齐后进行3D偏差分析并计算误差均值及均方根(root mean square,RMS)值。结果EOS 7D变焦组与传统测量法对比,以及相同摄影设备的组内对比差异均具有统计学意义(P<0.05)。单相机摄影测量法重构的颅骨与尸体三维模型的比较误差均值和RMS值的最小值存在于重建中等质量,趋势基本一致。结论摄影设备和焦距对单相机摄影测量法结果无明显影响,较低的重建质量易引起畸变,而较高的重建质量易产生噪点,以中等质量为宜。展开更多
The combination use of dexamethasone and calcium gluconate can be applied to hypersensitivity. Severe hypokalemia is a usual complication of dexamethasone and calcium gluconate therapy, which occurs frequently with th...The combination use of dexamethasone and calcium gluconate can be applied to hypersensitivity. Severe hypokalemia is a usual complication of dexamethasone and calcium gluconate therapy, which occurs frequently with therapeutic use. Fatal cases, accidental and intentional, occur frequently in forensic practice. The current case report presented a 43-year-old man with diabetes mellitus with infection, to whom dexamethasone and calcium gluconate were administered in the private clinic. With the development of such clinical symptoms of severe hypokalemia as quadriplegia, he was confirmed to have severe hypokalemia through a biochemical test before dying of arrhythmia. And also it presented pathophysiologic mechanism underlying severe hypokalemia as well as suggestions for clinical practice regarding combination use of dexamethasone and calcium gluconate.展开更多
Objective To reconstruct a car-pedestrian crash accident using numerical simulation technology and explore the injury biomechanism as forensic evidence for injury identification. Methods An integration of multi-body d...Objective To reconstruct a car-pedestrian crash accident using numerical simulation technology and explore the injury biomechanism as forensic evidence for injury identification. Methods An integration of multi-body dynamic, finite element (FE), and classical method was applied to a car-pedestrian crash accident. The location of the collision and the details of the traffic accident were determined by vehicle trace verification and autopsy. The accident reconstruction was performed by coupling the three-dimensional car behavior from PC-CRASH with a MADYMO dummy model. The collision FE models of head and leg, developed from CT scans of human remains, were loaded with calculated dummy collision parameters. The data of the impact biomechanical responses were extracted in terms of von Mises stress, relative displacement, strain and stress fringes. Results The accident reconstruction results were identical with the examined ones and the biomechanism of head and leg injuries, illustrated through the FE methods, were consistent with the classical injury theories. Conclusion The numerical simulation technology is proved to be effective in identifying traffic accidents and exploring of injury biomechanism.展开更多
Objective To explore the injury mechanism of the human knee in a traffic accident by establishing a 3D finite element(FE) model. Methods The FE model, composed of femur, tibia, fibula, patella, meniscus, knee ligament...Objective To explore the injury mechanism of the human knee in a traffic accident by establishing a 3D finite element(FE) model. Methods The FE model, composed of femur, tibia, fibula, patella, meniscus, knee ligaments and surrounding soft tissues, was reconstructed by CT scanning data from a male volunteer. Validation was performed by the lateral impact simulation, and the stress and strain results were obtained to be compared with those previously reported for injury prediction. Results The results derived from the FE model were found to be similar with those previously reported, most of the ligaments and meniscus wounded at 40 m/s collision, which was readily observed. Conclusion The simulation results generated by FE model can be effectively used for the injury mechanism analysis of initial contact.展开更多
Acute compartment syndrome （ACS） usually occurs after an injury to a limb or other adjacent organ, when there is insufficient blood supply to muscles and nerves due to swelling and increased pressure within a body c...Acute compartment syndrome （ACS） usually occurs after an injury to a limb or other adjacent organ, when there is insufficient blood supply to muscles and nerves due to swelling and increased pressure within a body compartment. Classically, there are six symptoms and signs associated with ACS, all of which have an initial letter ＇P＇： pain, paresthesia, pallor, paralysis, pulselessness and poik- ilothermia The complexities of the clinical diag- nosis and management of ACS remain a challeng- ing oroblem for orthooedic surgeons.展开更多
文摘目的分析摄影设备、焦距及重建软件中重建质量的选择等因素对单相机摄影测量法重构结果的影响,为单相机摄影测量法的法医学应用提供参考。方法采用传统测量法和单相机摄影测量法分别测量19个颅骨,分析两种测量法的差异及相同摄影设备不同焦距组的组内差异。以1例颅骨和1具尸体为研究对象,根据摄影测量软件中重建质量分为5个等级,以光学扫描重构模型为参考模型,单相机摄影测量法重构模型为测试模型,最佳拟合对齐后进行3D偏差分析并计算误差均值及均方根(root mean square,RMS)值。结果EOS 7D变焦组与传统测量法对比,以及相同摄影设备的组内对比差异均具有统计学意义(P<0.05)。单相机摄影测量法重构的颅骨与尸体三维模型的比较误差均值和RMS值的最小值存在于重建中等质量,趋势基本一致。结论摄影设备和焦距对单相机摄影测量法结果无明显影响,较低的重建质量易引起畸变,而较高的重建质量易产生噪点,以中等质量为宜。
文摘The combination use of dexamethasone and calcium gluconate can be applied to hypersensitivity. Severe hypokalemia is a usual complication of dexamethasone and calcium gluconate therapy, which occurs frequently with therapeutic use. Fatal cases, accidental and intentional, occur frequently in forensic practice. The current case report presented a 43-year-old man with diabetes mellitus with infection, to whom dexamethasone and calcium gluconate were administered in the private clinic. With the development of such clinical symptoms of severe hypokalemia as quadriplegia, he was confirmed to have severe hypokalemia through a biochemical test before dying of arrhythmia. And also it presented pathophysiologic mechanism underlying severe hypokalemia as well as suggestions for clinical practice regarding combination use of dexamethasone and calcium gluconate.
基金This study was funded by Key Projects in the National Science ＆ Technology Pillar Program in the 12th Five-Year Plan （No. 2012BAK16B02）, the Council of National Science Foundation China （No. 81273338, 81102300）, the Science and Technology Committee of Shanghai Municipality （No. 12DZ2271500, 10ZR1431200） and the Central Research Institute Public Project （No. GYll05）.
文摘Objective To reconstruct a car-pedestrian crash accident using numerical simulation technology and explore the injury biomechanism as forensic evidence for injury identification. Methods An integration of multi-body dynamic, finite element (FE), and classical method was applied to a car-pedestrian crash accident. The location of the collision and the details of the traffic accident were determined by vehicle trace verification and autopsy. The accident reconstruction was performed by coupling the three-dimensional car behavior from PC-CRASH with a MADYMO dummy model. The collision FE models of head and leg, developed from CT scans of human remains, were loaded with calculated dummy collision parameters. The data of the impact biomechanical responses were extracted in terms of von Mises stress, relative displacement, strain and stress fringes. Results The accident reconstruction results were identical with the examined ones and the biomechanism of head and leg injuries, illustrated through the FE methods, were consistent with the classical injury theories. Conclusion The numerical simulation technology is proved to be effective in identifying traffic accidents and exploring of injury biomechanism.
基金The current study was funded by the 12th Five-year National Plan for Science and Technology，the Council of National Science Foundation of China，the Science and Technology Commission of Shanghai Municipality，the Science Foundation of IFS
文摘Objective To explore the injury mechanism of the human knee in a traffic accident by establishing a 3D finite element(FE) model. Methods The FE model, composed of femur, tibia, fibula, patella, meniscus, knee ligaments and surrounding soft tissues, was reconstructed by CT scanning data from a male volunteer. Validation was performed by the lateral impact simulation, and the stress and strain results were obtained to be compared with those previously reported for injury prediction. Results The results derived from the FE model were found to be similar with those previously reported, most of the ligaments and meniscus wounded at 40 m/s collision, which was readily observed. Conclusion The simulation results generated by FE model can be effectively used for the injury mechanism analysis of initial contact.
文摘Acute compartment syndrome （ACS） usually occurs after an injury to a limb or other adjacent organ, when there is insufficient blood supply to muscles and nerves due to swelling and increased pressure within a body compartment. Classically, there are six symptoms and signs associated with ACS, all of which have an initial letter ＇P＇： pain, paresthesia, pallor, paralysis, pulselessness and poik- ilothermia The complexities of the clinical diag- nosis and management of ACS remain a challeng- ing oroblem for orthooedic surgeons.
