Objective To study the method of gray-scale blood flow imaging and image processing in condition of high frequency ultrasound,and the implementation of the system.Methods On the base of research of scattered signals of red blood cells in high frequency ultrasound,20 MHz ultrasound mechanical and linear scanning probe was used to transmit a number of pulses on a scan line.Pulse-echo subtraction method was used to obtain the blood flow information.At the end,simulated blood vascular was used to conduct flow imaging,and the obtained images were analyzed.Results Experiment results showed that clear blood flow images were obtained using this system.The noise from perivascular tissue could be filtered and the signals from blood flow could be enhanced after image processing.Conclusions In the detection of superficial blood vessel,blood flow signals can be obtained even using single pulse emitting via high frequency ultrasound.The blood flow imaging system can be implemented after image processing.

Objective To explore the effect of the physician-nurse-social worker linkage rehabilitation model on the psychological status in patients receiving methadone maintenance treatment(MMT).Methods Ninety-four patients who received MMT were enrolled and randomly divided into experimental group(n = 48)and control group(n = 46).The experimental group received physician-nurse-social worker linkage rehabilitation model intervention,while the control group received conventional methadone treatment service.The anxiety,depression and quality of life of the two groups were evaluated before the intervention,3 months and 6 months after the intervention.Results After 6 months of physician-nurse-social worker linkage rehabilitation mode intervention,the depression status and the anxiety status of the experimental group subjects were significantly improved compared with those before intervention,and both BDI and BAI scores were significantly lower than those of the control group subjects(P＜0.05).Moreover,the proportion of"had depression"and"had anxiety"in the experimental group were significantly lower than those in the control group(P＜0.05).After 6 months of intervention,the QOL-DA score of the experimental group subjects(183.77±8.90)was significantly higher than that of the control group sub-jects(174.76±11.14)(P＜0.01).Conclusion The physician-nurse-social worker linkage rehabilitation model had certain advantages in improving the psychological state of MMT patients,which is worthy of promotion.