The method and developing progress on 3D reconstruction technology based on medical image are introduced.Because 3D reconstruction technology is applied in observing bone tissue,cavum viscera and nerve tissue in clinic medicine,clear and vivid images in three dimensions can be reconstructed for clinical diagnosis.The 3D reconstruction technology based on medicine image has great application value in the course of diagnosis and therapy.[Chinese Medical Equipment Journal,2008,29(2):34-36]

Objective To expand peripheral memory of DSP by using FMl8L08.Methods Because FMl8L08 not only can be randomly read in high speed,but is non-volatile and compatible with the pins of SRAM,the interface to TMS320F2812 was designed based on FMl8L08.Results FMl8L08 is used as TMS320F2812 peripheral memory expansion,instead of traditional separate ROM and RAM design,and be applied to the 12-lead ECG development.Conclusion This scheme can predigest software and hardware design complexity,enhance the system stabilization and decrease the power consumption.

The conventional invasive tissue blood oxygen content measurement is poor in continuity.The weakness of the signal,strong interference and random transmission of the photon in tissues make the measurement difficult.Recently,near infrared spectrum technology has been applied to tissue blood oxygen content measurement.This paper presents a hardware design method for tissue blood oxygen content measurement by near infrared spectrum technology.

Objective To investigate the effects of unaggregated amyloid ? protein(A?25～35) on transient outward potassium channel(IA) in Rat Hippocampal CA3 Pyramidal Neurons.Methods Patch-clamp technique with whole cell recording was used.Results Unaggregated A?25～35 inhibited IA in neonatal rat hippocampal CA3 pyramidal neurons and displayed a time-,concentration- and voltage-dependent manner;the dynamic characteristics of IA were influenced:shifted the steady-state activation and inactivation curves to left significantly.Conclusion These results suggest that the inhibition of unaggregated A?25-35 on transient outward potassium channel in acutely isolated hippocampal CA3 pyramidal neurons may be an important mechanism of its toxicity,which participates in pathological changes of AD.

Objective To evaluate the feasibility and safety of radioactive pancreatic duct stents implanted in the pancreatic ducts of pigs by endoscopy. Methods Different doses of 125I radioactive pancreatic duct stents were implanted in the pancreatic ducts of pigs by endoscopy. Blood tests were conducted before and after implantation. 14,30 and 60 days after implantation of the radioactive stents, the pigs were euthanized in batch. All animals underwent post modem examination to exclude intra-abdominal hemorrhage,pancreatic fistula or peritonitis. During autopsy,the liver,bile ducts,head of the pancreas,stomach and duodenum were examined for perforation,stricture or dilation and damage of the surrounding structures.Results Fourteen pigs were implanted with pancreatic duct stents by endoscopic procedures.There was no effusion,hemorrhage or necrosis in the adjacent duodenum,stomach,liver or right kidney.The noral morphological structures of the duct of Wirsung disappeared in all the treated pigs.Histopathological examination revealed that the stents were surrounded by necrotic tissue and outside fibrous tissue. During the follow-up period, the width of outside fibrous tissue gradually increased. There were no serious abnormalities noted in the blood tests after implantation. Conclusion It is indicated that the radioactive stents are safe in all the difierent dose groups. For future clinical application, it is feasible to design a special radioactive stent for each patient according to the size,shape and position of the pancreatic tumor.

Objective To design radioactive biliary stents and to evaluate the feasibility and safety of the stents.Methods Plastic stents with inserted iodine-125 seeds were designed and tested in sixteen normal pigs. In the brachytherapy group,the pigs were implanted radioactive stents in the common bile duct (CBD) and then divided into three groups on the basis of radiation dose of the reference point,50 Gy group (n=4),100Gy group (n=4),and 150 Gy group (n=4).In the control group,the same plastic stents with non-radioactive seeds were implanted (n=2),whilst in the blank control group,no stents were implanted (n=2).Blood routine,serum amylase,liver and kidney function were tested before and 1,7,14,30,60 days after the implantation of stents. Animals were sacrificed on the 14,30 and 60 days after stem implantation.Some relevant index such as perito- neal bleeding and inflammation,ascites,injury of adjacent organs,as well as perforation,stricture and dilatation of bile duct were investigated.Bile duct tissues were stained with H-E,and observed under microscopy. Results The radioactive plastic biliary stents were successfully prepared and implanted.There was no effusion, hemorrhage or necrosis in the adjacent organs of radioactive biliary stent implanted group.Perforation of the CBD wall was not observed in the brachytherapy group.By pathological examination in the CBD,obvious hyperplasia of the mucosa and mucosal glands were seen in the control group.Necrosis of mucosal layer existed in brachy- therapy groups.In 50 Gy group,mucosal layer was incomplete and mild hyperplasia of mucosal glands was seen. In 100 Gy group,mucosal layer disappeared and almost no hyperplasia of the mucosal glands could be found.In 150 Gy group,mucosal layer disappeared and mucosal glands obviously decreased.There were no obvious abnormalities noted in blood tests after implantation in each group.Conclusions The design of radioactive biliary stents are feasible and safe.The radioactive stents have obvious radiation effect besides the mechanical effect on the mucosal layer of CBD.