Objective To investigate the feasibility and value of automatic segmentation of infant brain images based on diffusion tensor image (DTI).Methods A method of segmentation of infant brain based on DTI images was proposed.The method was mainly included two stages:①Extracting the cerebrospinal fluid (CSF) using the distribution of water;②Extracting the white matter (WM) adopting the anisotropic diffusion of water in neurons,followed by distinguishing the gray matter (GM) component.Results Through the feature selection method designed in this study,the effective DTI feature combination was selected.The first step was to extract CSF with mean diffusity (MD) and the third eigenvalue (L3),and the second step was to extract WM and GM with fractional anisotropy (FA) and the L3.The highest average similarity was obtained by the two steps.The two-step segmentation could be successfully performed in infant brain image segmentation and satisfied with the split effect.Conclusion The automatic segmentation of infant brain based on DTI in this study is reasonable and feasible,and has high segmentation accuracy.

To emphasize the great function of medical engineering science in the development of sanitarium through analyzing the actual status of medical engineering science in military sanitarium,especially the actual status of management for medical equipment. Starting from the overall management of medical equipment,the reinforcement of medical engineering construction in sanitarium shall ceaselessly develop the connotation of medical engineering and improve the professionalism of medical engineering staff through various ways,so that it can contribute to the healthy,stable and fast development of military sanitarium.

By analyzing the present medical metrology in army medical service units,the importance of medical metrology is emphasized in the development and construction of every unit.In particular,manifold methods should be used to unceasingly improve the professional quality of medical metrology personnel.The development and construction of this subject should be unceasingly expanded in its connotation.It is expected to promote the development of medical service units in a healthy,stable and rapid way by strengthening the construction of medical metrology.

Objective To improve knowledge of the Wilson's disease by analysing its CT findings of the head.Methods CT scans were performed in all cases,CT findings of head were analysed retrospectively.Results CT findings were mainly brain atrophy and the low density of basal ganglia.31 cases had symmetrical ribbon-like or crescent low density in the lentiform nuclei,three had oval low density inthe caudate nucleus,four had symmetrical oval low density in the thalamus,one was normal but atrophy.All cases had brain atrophy.Conclusion The most common CT findings in hepatolenticular degeneration patients are mainly brain atrophy and low density of the basal ganglia,especially the symmetrical low density of the lentiform nuclei is characteristic of Wilson disease on CT.

The paper proposed a new method to design and fabricate a flexible neural microelectrode arrays (MEA) for retinal prosthesis, the ion-beam technology was introduced to decrease the width of conductive wires and the distances between wires, a high density MEA (120 microelectrodes with a matrix of 10 x 12) was fabricated on a single layer of polymer from this. The MEA was proved to possess a fine electrochemical property. In vitro test, the average impedance of MEA on 1 kHz was 16 k omega +/- 2 k omega and the average phase difference was -85 degrees +/-30 degrees.
Micro-Electrical-Mechanical Systems ; Microelectrodes ; Prosthesis Design ; Visual Prosthesis

BACKGROUND:Analgesia in different ways can be selected for the elderly in hip and knee arthroplasty. Considering the actual situation of the elderly patients, choice of anesthesia should be reasonable in order to achieve fast acting, long lasting time and good analgesic effect. OBJECTIVE:To explore the analgesic effect of ropivacaine of lumbar epidural anesthesia on elderly knee arthroplasty. METHODS:A total of 78 elderly patients aged 80-96 years, who were treated with hip and knee arthroplasty in the Shenyang Orthopaedic Hospital from September 2011 to September 2014, were enrol ed in this study. They were equal y and randomly assigned to control group and observation group, and separately administered continuous epidural anesthesia and lumbar epidural anesthesia with ropivacaine. The excel ent and good rate, onset time, anesthetic induction, frequency of use of Duffing mixture, and adverse reactions were compared between the two groups. RESULTS AND CONCLUSION:The excel ent and good rate of analgesic effect was higher in the observation group (97%) than in the control group (87%) (P<0.05). Onset time was significantly shorter, the dose of anesthetic was significantly less, frequency of use of Duffing mixture was significantly less in the observation group than in the control group (P<0.05). The difference was not significant in adverse reactions between the two groups (P>0.05). Above results indicated that lumbar epidural anesthesia of ropivacaine obtained good analgesic effects during elderly knee arthroplasty.

OBJECTIVE: To establish an in vitro equilibrium dialysis method for studying the plasma binding rate of brazilein. METHODS: Equilibrium dialysis was used to determine the binding rates of brazilein to bovine serum albumin and rat plasma, and the compound concentration was determined by HPLC. All the biological samples were handled with acetic ether-extraction. RESULTS: The bovine serum albumin binding rates of brazilein at low, medium and high concentrations ranged from 38.5% to 50.8%, and the rat plasma binding rate of brazilein ranged from 86.2% to 97.3%. CONCLUSION: Brazilein has high binding capacity to plasma, and the phospholipid components may have major contribution to the binding between brazilein and plasma. Copyright 2012 by the Chinese Pharmaceutical Association.

Objective:To investigate the effect of ultrasound-guided transverse abdominal plane block combined with dexmedetomidine on cesarean section.Methods:Eighty pregnant women undergoing elective cesarean section under general anesthesia in Binzhou Central Hospital from October 2017 to October 2019 were included in this study. They were randomly assigned to undergo either cesarean section under general anesthesia followed by patient- controlled intravenous analgesia (control group, n = 40) or ultrasound-guided transverse abdominal plane block combined with intravenous dexmedetomidine administration (observation group, n = 40). Analgesic efficacy and the analgesic effect on puerperas and their newborns were compared between the observation and control groups. Results:At 2, 4 and 12 hours after surgery, the Visual Analogue Scale score in the observation group was (2.1 ± 0.9) points, (2.2 ± 0.7) points, (3.0 ± 0.6) points, respectively, which was significantly lower than (4.4 ± 1.3) points, (4.9 ± 1.2) points, (3.9 ± 0.8) points in the control group, respectively ( t = 8.946, 7.854, 6.246, all P < 0.05). At 2, 4 and 12 hours after surgery, the comfort score in the observation group was (3.4 ± 0.8) points, (3.2 ± 0.7) points, (3.3 ± 0.7) points, respectively, which was significantly higher than (2.1 ± 0.7) points, (2.2 ± 0.9) points and (2.5 ± 0.8) points respectively in the control group ( t = 7.235, 6.130, 5.953, all P < 0.05). After surgery, the number of times the demand button of the anesthesia pump in the observation group was pressed was (8.4 ± 2.9), with the rate of patient satisfaction of 97.50% (39/40), which was significantly higher than that in the control group [13.1 ± 3.7, 77.50% (31/40), t = 7.036, χ2 = 9.347, both P < 0.05). At 1 and 2 days after surgery, the cumulative amount of anesthetics used for patient-controlled intravenous analgesia was (52.1 ± 1.9) mL and (121.7 ± 4.1) mL respectively, which were less than (63.6 ± 2.4) mL and (146.5 ± 5.3) mL in the control group, respectively ( t = 6.240 and 8.842, both P < 0.05). The score of extubation quality in the observation group was significantly lower than that in the control group [(1.3 ± 0.3) points vs. (3.2 ± 0.5) points, t = 6.664, P < 0.05]. There was statistically significant difference in cortisol content between the two groups at 10 minutes after extubation and at the time points of fetus removal, skin incision and intubation (all P < 0.05). In the observation group, the partial pressure of carbon dioxide in the umbilical cord blood was significantly reduced, the partial pressure of oxygen and the oxygenation index in the umbilical cord blood were significantly increased, and Apgar score at 1 minute after birth was significantly increased (all P < 0.05). Conclusion:Ultrasound-guided transverse abdominal plane block combined with dexmedetomidine can enhance the anesthetic effect on cesarean section, prolong analgesic time, reduce the amount of analgesics, improve the operation effect, reduce maternal stress responses, and improve maternal and infant health.

Objective To study the effect of CO_2 pneumoperitoneum on animals with intra-abdominal infection.Methods A total of 60 New Zealand white rabbits were used in this study.The animals were divided into two groups (30 in each),and injected with Escherichia coli or bacteroides fragilis into the abdominal cavity to establish models of intra-abdominal infection.In each group, the rabbits were subdivided into laparotomy,pneumoperitoneum,and control subgroups.Before the injection,the peripheral blood of the rabbits in each group was obtained to determine the WBC count and level of C-reactive protein (CRP,by ELISA).After the operation,the tests were repeated for 4 times at days 1,2,4,7 respectively.Afterwards,the animals were killed,and the viscera were harvested for aerobic and anaerobic culture.Results In each of the two groups,the WBC count in the laparotomy subgroup were significantly higher than that in the pneumoperitoneum subgroup at day 1 (P

Objective To study the value of helical multi-phase contrast scanning in the preoperative evaluation of cholangiocarcinoma hilar.Methods Pre-and post-contrast CT scanning of upper abdomen were performed in 26 cases with hepatic portal cholangiocarcinoma.Arterial phase scan of the whole liver began at 30 s after initial injection of contrast medium and the portal venous phase scan started at 70 s.15 of 26 cases underwent additional delayed phase scans began at 3~4 min.Thin thickness(3~5 mm)scanning of hepatic portal was used in each post-contrast phase scanning.The location,size,enhancement patterns of the lesions and the extent of the tumor involvement were observed and surgical resecetability was evaluated.Results All of 26 lesions were detected in helical multi-phase contrast scanning. 16 lesions enhanced on the arterial phase. On the portal venous phase, all lesions were enhanced and marked enhancement was seen in 19 lesions. Prolonged enhancement was seen in 15 lesions on the delayed phase scanning. The accuracy of evaluating surgical respectability was 84.62%. Conclusion Multi-phase contrast scanning combined with thin thickness scanning can demonstrate obviously the location and enhanced patterns of hepatic portal cholangiocarcinoma, the accuracy in evaluating surgical respectability is improved, and it is helpful in choosing the preoperative treatment program and assessing the prognosis.