Objective To prepare a novel loaded NdFeB and Fe3O4 liquid-solid phase inversion poly (polylactic-co-glycolic acid,PLGA) in situ implant (PLGA 60％ NdFeB-20％ Fe3O4) for ultrasound-guided intratumoral injection,and to investigate its intensity of magnetism and therapeutic efficiency of nude mice bearing MDA-MB-231 breast cancer.Methods PLGA-60 ％ NdFeB-20 ％ Fe3O4 in situ implant was prepared.The microstructure of PLGA-60 ％ NdFeB-20 ％ Fe3O4 was tested with scanning electron microscope (SEM).Magnetometer was used to qualify the intensity of magnetism.For the in vitro assay,60 μl solid PLGA-60％ NdFeB-20％ Fe3O4 implant was put in the center of the electromagnetic induction heating coil.Infrared thermal video of the tubes was simultaneously recorded.The size of 2 cm × 2 cm× 2 cm fresh ex vivo bovine liver was prepared,and then 60 μl PLGA-60％ NdFeB-20％ Fe3O4 was injected into it.Similarly,ex vivo bovine liver was heated by the above intermittent time for 1,2,3,4 minutes,respectively,and the ablation volume was calculated.Finally,nude mice were equally divided into treatment group and control group.Mice in treatment group were discontinuously heated for 3 min after being injected with the above mentioned implant,while CEUS was performed before and after heating to observe the blood perfusion in the tumor.One nude mouse was executed on the next day in each group,then pathological sections and HE staining of tumor tissue were taken,whereas the growth of the remaining nude mice were observed daily.Results SEM showed the implant with rough and porous surface.The magnetism increased with the volume of material.The tube and bovine liver experiments showed that the PLGA-60 ％ NdFeB-20％ Fe3O4 generated heat efficiently.The bovine liver ablation experiment showed that the range of ablation of 60 μl PLGA-60 ％ NdFeB-20％ Fe3O4 implant reached (2.34±0.25)cm3 after 3 min heating.In vivo experiments showed that the tumor tissue began to form a scab on the 2nd day,and the scab began to desquamate on the 20th day.CEUS showed the original predominant enhancement disappeared significantly after the treatment.HE staining proved that cancer cells had coagulative necrosis,whereas tumors in control group became bigger.Conclusion PLGA-60％ NdFeB-20％ Fe3O4 in situ implant can produce obvious thermal effect under high frequency alternating magnetic field,therefore can be effectively ablated with nude mice MDA-MB-231 breast cancer during time interval heating.

In terms of service management in the medical equipment field, Medical Equipment after-sale Service Satisfaction Evaluation System is established through expert consultation and sample experiment. Meanwhile, questionnaire survey has been applied to local service satisfaction survey work among equipment managements and clinical departments in seventy second and third grade hospitals in Shanghai in ten consecutive years. The result indicates that the satisfaction index has been growing slightly and stably, which clearly demonstrates that the evaluation has continually boosted the service work of various mainstream suppliers. And overall, the evaluation has played an active role in safeguarding and motivating the safety and effectiveness of medical equipment.

Taking Endoscopy in hospitals as the research object, study on the safety risk characteristics in digital integration environment. On the basis of risk analysis, risk prevention and control measures are proposed from personnel, equipment, water and electricity, disinfection and the surrounding environment. Establish the endoscope safety risk management safeguard system to improve the safety risk management level of endoscopy.

This paper reviews the basic principles and calculation methods of MR specific absorption rate, discusses the clinical application of MR specific absorption rate.
Humans ; Magnetic Resonance Imaging ; Radio Waves

Through integration of medical imaging resources of 12 community hospitals in the region, a community hospital diagnostic image center was established in 6th hospital. This paper describes the design of the structure and mode of data storage of regional PACS system and the establishment of a database of medical imaging, through which the medical imaging diagnostic level in the community was improved significantly. Through the application of regional PACS system, medical resource was saved and patient treatment facilitated.
Computer Communication Networks ; Information Storage and Retrieval ; methods ; Radiology Information Systems ; Software Design

This article briefly summarized conventional k-space technique, partial k-space sampling and key hole technique, then introduced the latest applications during these years.
Magnetic Resonance Imaging

This article briefly summarized conventional k-space technique, partial k-space sampling and key hole technique, then introduced the latest applications during these years.

Through integration of medical imaging resources of 12 community hospitals in the region, a community hospital diagnostic image center was established in 6th hospital. This paper describes the design of the structure and mode of data storage of regional PACS system and the establishment of a database of medical imaging, through which the medical imaging diagnostic level in the community was improved significantly. Through the application of regional PACS system, medical resource was saved and patient treatment facilitated.

This paper introduces general architecture of wireless sensor networks architecture and application in healthcare, discusses the application direction which is urgent need to expand in medical field.
Telemedicine ; methods ; Wireless Technology

Calculation methods of coil sensitivity in parallel MRI were elaborated, compared and analyzed.
Algorithms ; Magnetic Resonance Imaging ; instrumentation ; methods