Optical positioning system has a wide range of application in many fields. This paper presents an optical positioning method which combines linear and plane cameras. 1-D image signal of linear camera is used to get 1-D coordinates of the targets, which can be processed quickly. We can use it to assist processing the 2-D image signals of plane camera under some constraints. Linear camera can reduce the amount of position searching and calculation in coordinates extracting of targets in 2D image, and it can also help identify multiple targets. The results showed that our method could reach an accuracy of 1.608 mm, which was about one thousandth of the measurable range, and the reconstruction time for 4 targets without geometric constraints is 23.87 ms, namely 41.9 fps.
Objectives To identify the effect of procalcitonin (PCT) on the choice of operating time for severe acute pancreatitis and assessment of postoperative complications by monitoring the level of serum PCT and recording the incidence of postoperative complications. MethodsNinety-three patients who underwent debridement and drainage of infected necrosis from Sep. 2009 to Dec. 2011 were included. Serum PCT was tested on the day of admission (0 day), one week after admission, one day before surgery, one day after surgery, and one week after surgery. According to the level of serum PCT, all the 93 patients were divided into 3 groups:low level group (PCT < 2 ng/mL), middle level group (PCT 2-10 ng/mL), and high level group (PCT > 0 ng/mL). Postoperative complications were also recorded. ResultsThe incidence of postoperative complications was 19.4% (18/93). There were postoperative bleeding in 13 patients, intestinal fistula in 14 patients, pancreatic fistula in 18 patients, pulmonary infection in 4 patients, residual abscess in 10 patients; re-operation in 15 patients, and death in 8 patients (the death rate was 8.6%). Besides the pulmonary infection, and grade A and C of pancreatic fistula, the incidence of various complications in middle level group and high level group were lower than low level group (P < 0.05). Patients with complications had significantly higher PCT value in one week after admission than onset (P < 0.05). PCT value was higher in the patients with intestinal fistula and residual abscess on one day after operation than on one day before operation (P < 0.05). Patients who died or with re-operation had significantly higher PCT value in one week after operation than on one day after operation (P < 0.05). In the dead patients, the serum PCT sustained at a high level after operation. ConclusionsThe level of serum PCT is correlated with the incidence of postoperative complications. Dynamic monitoring the level of serum PCT can guide the choice of operative time and assessment of postoperative complications including intestinal fistula, pulmonary infection, and death, which can greatly improve the prognosis of SAP.
ObjectiveTo explore the endothelial cells from human peripheral blood and islet of rat co-transplantation under the renal capsule of diabetic nude mice to improve the survival and function of transplanted islet. MethodsThe endothelial cells from human peripheral blood(5×105)and freshly isolated rat islet cells were co-transplanted under the renal capsule of diabetic nude mice model, then the fasting blood glucose, body weight, peripheral blood C-peptide level, and intraperitoneal glucose tolerance test(IPGTT) were measured to evaluated the islet graft survival and function. ResultsCompared with the control group, the fasting blood glucose level significantly decreased(P < 0.01), peripheral blood C-peptide level rised(P < 0.01), and body weight increased(P < 0.01) of receptor nude mice in experience group, the IPGTT also improved. ConclusionThe endothelial cells from human peripheral blood and islet of rat co-transplan-tation can obviously improve the survival and function of transplanted islet of nude mice.