Pelvic Injury Discriminative Model Based on Data Mining Algorithm / 法医学杂志

OBJECTIVES@#To reduce the dimension of characteristic information extracted from pelvic CT images by using principal component analysis (PCA) and partial least squares (PLS) methods. To establish a support vector machine (SVM) classification and identification model to identify if there is pelvic injury by the reduced dimension data and evaluate the feasibility of its application.@*METHODS@#Eighty percent of 146 normal and injured pelvic CT images were randomly selected as training set for model fitting, and the remaining 20% was used as testing set to verify the accuracy of the test, respectively. Through CT image input, preprocessing, feature extraction, feature information dimension reduction, feature selection, parameter selection, model establishment and model comparison, a discriminative model of pelvic injury was established.@*RESULTS@#The PLS dimension reduction method was better than the PCA method and the SVM model was better than the naive Bayesian classifier (NBC) model. The accuracy of the modeling set, leave-one-out cross validation and testing set of the SVM classification model based on 12 PLS factors was 100%, 100% and 93.33%, respectively.@*CONCLUSIONS@#In the evaluation of pelvic injury, the pelvic injury data mining model based on CT images reaches high accuracy, which lays a foundation for automatic and rapid identification of pelvic injuries.

Progress in diagnosis of neurogenic erectile dysfunction / 法医学杂志

Recently, with application of evoked potentials technology in the test of somatic and autonomic nerves, quantitative sensory testing in the detection of small nerve fiber function, and functional magnetic resonance imaging in the detection of senior central function, the detection of neural function has become more accurate. This article reviews the progress and application of diagnostic methods about neurogenic erectile dysfunction in order to provide a reference for forensic diagnosis and research in the future.

Application of quantitative temperature testing in diagnosis of neurogenic erectile dysfunction / 法医学杂志

OBJECTIVE@#To explore the application of quantitative temperature testing (QTT) in forensic identification and clinical diagnosis of neurogenic erectile dysfunction (NED).@*METHODS@#TSA-II-NeuroSensory Analyzer was used to measure the thresholds of four kinds of sensory, including cold, cold pain, heat, heat pain, in 22 normal and 35 NED patients at dorsal glans (DG), left thigh interior (LTI) and left thenar (LT). To calculate the relative thresholds of the sensory mentioned above between DG and LTI (DG/LTI), and between DG and LT (DG/LT). Then to analyze those thresholds and the relative thresholds.@*RESULTS@#NED group showed significant higher threshold than the normal group in DG-heat, DG-heat pain, LTI-heat, LTI-heat pain, DG/LTI-heat, DG/LT-heat, DG/LT-heat pain (P < 0.05).@*CONCLUSION@#The threshold of QTT at dorsal glans could be used as an accessory indicator in forensic medicine and clinical diagnosis of NED.

Accurate determination of wound depth with ultrasound and its forensic significance / 法医学杂志

Accurate determination of the wound depth has long been a difficult task in forensic medicine due to lack of technology. Nowadays, the depth of the wound can be accurately determined by using high frequency 2-D ultrasound and Color Doppler Flow Imaging (CDFI). Two typical cases with ultrasonic images were reported to show the importance of ultrasound technology in forensic medicine. The new technology provides scientific evidence of the injury assessment.

Pathomorphologic study of the fibrous cap and fatty core of coronary arthrosclerotic plaque in sudden coronary death / 法医学杂志

OBJECTIVE@#The differences in the thickness of fibrous cap and the percentage of fatty core of the coronary atherosclerotic plaques between sudden coronary death (SCD) group and the control group were investigated.@*METHODS@#Sixty-four autopsy cases were divided into SCD and control groups. Samples were taken from the most severely damaged portions of the coronary atherosclerotic plaques, sectioned, stained with HE, and the percentage of examined by light microscopy for morphologic changes and structural alternations. Image analysis system was adopted to compare the thickness of fibrous cap and percentage of fatty core in the whole plaque between the two groups, and allthe data were analyzed and calculated with SPSS 11.5 statistic software.@*RESULTS@#There were 15 grade III and 21 grade IV atherosclerotic cases found in the SCD group, while there were 16 and 12 found in the control group, respectively. Although no significant differences on the severity of atherosclerosis were found between the two groups (P > 0.05), there were significant differences on the thickness of the fibrous cap and the percentage of fatty core found between the two groups (P < 0.01).@*CONCLUSION@#Our study indicates that there are significant differences in the thickness of fibrous cap and the percentage of fatty core in atherosclerosis plaques between the SCD group and the control group. These observed differences may be helpful for morphological diagnosis of SCD.

Forensic identification for 16 cases with lumbar sacralization and lumbarization / 法医学杂志

Lumbar sacralization and lumbarization are congenital spine malformation. 16 cases with lumbar sacralization or lumbarization were reviewed. Through studying the etiopathogenisis and clinical manifestation we analyze the relationship between injury and disease. 6 cases of 16 have lumbar sacralization. 10 cases are attributed to lumbarization. Most of this cases have backleg pain more or less. As a forensic doctor we suggest that pay more attention to this problem in our identify practice and locate the sequence of vertebral body more exactly.

Dissection of cavernous nerves in rat and model of neurological erectile dysfunction / 法医学杂志

OBJECTIVES@#To identify rat cavernous nerve and establish a rat model of erectile dysfunction caused by injury of cavernous nerve.@*METHODS@#Ten rats were undergone dissections. 30 experimental rats were randomized into 2 groups, cavernous nerve were identified by electrical stimulation. One month after surgery, rat models were evaluated by electrical stimulation.@*RESULTS@#The anatomic structure of cavernous nerve in rats are highly similar to human beings, the erection can be evoked by stimulating cavernous nerves, and after cavernous nerve injury it can not be evoked (P < 0.05).@*CONCLUSION@#Because of the highly similarity of cavernous nerve between rats and human beings, so as the suitable price, rat should be used as the ideal ED experimental animal. The model of ED caused by cavernous nerve injury is reliable.

The method and new advance in diagnosing erectile dysfunction / 法医学杂志

Recently, we have a further understanding on the pathogeny of erectile dysfunction, and with the application of so many new technologies, such as color Doppler ultrasound, electrical impedance, evoked potential, sensor etc. The diagnosis of ED becomes more and more scientific and convenient. Today we make a review on all kinds of diagnosing methods in order to recognise it more clearly and to provide some more precise and practical way for forensic evaluation in future.