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Li J.-F.,General Hospital of Shenyang Military Command | Qu H.,General Hospital of Shenyang Military Command | Zheng C.-H.,The 201 Hospital of Chinese PLA | Tang H.-T.,Health Center | Xing C.-S.,Shenyang Military Region
Chinese Journal of Tissue Engineering Research | Year: 2013

Background: Acute rejection is a key factor for long survival of transplanted heart. Therefore, discovering and controlling acute rejections in time is very important in clinical practice. Objective: To investigate the clinical significance of ultrasoundcardiogram after heart transplantation. Methods: Recently published articles concerning clinical and animal research on ultrasoundcardiogram following heart transplantation were searched. Then, we analyzed the features of ultrasoundcardiogram of transplanted heart, structural and functional changes of donor hearts in the recipients. Relevant markers were measured and compared to evaluate the effect of ultrasoundcardiogram against acute rejections after heart transplantation. Results and Conclusion: Ultrasoundcardiogram can invasively monitor acute rejections after heart transplantation in time, and also can provide important references for pre-transplantation recipient evaluation, intra-transplantation monitoring, and post-transplantation follow-up. However, lack of cases and post-transplantation monitoring in different periods may impact our findings. Post-transplantation monitoring in the same period can improve the comparativeness and accuracy of the study. Source

Li J.-F.,General Hospital of Shenyang Military Command | Qu H.,General Hospital of Shenyang Military Command | Zheng C.-H.,The 201 Hospital of PLA | Tang H.-T.,District Health Station of Benxi Branch of Shenyang Military Command | Xing C.-S.,Shenyang Military Region
Chinese Journal of Tissue Engineering Research | Year: 2013

Background: Current clinically used ultrasound contrast agents are microbubble contrast agents containing different gas components. The microbubble contrast agents allow further development of ultrasonic diagnosis and have become a study focus in contrast agents. Objective: To explore methods of preparing polymer ultrasound contrast agents and analyze their clinical application in disease treatment. Methods: Ultrasound contrast agents are composed of gas microbubble and encapsulated membrane. The membrane materials contain albumin, macromolecule liposome, polymer and various surface active agents. Imaging of ultrasound contrast is achieved through enhancing backscatter signals. The development of ultrasound contrast agents is divided into three stages, and visualization-related techniques include second harmonic, tissue specific developing, pulse inversion harmonic imaging, coherent contrast imaging, contrast pulse sequence, energy Doppler harmonic imaging, intermittent harmonic imaging, coded harmonic imaging and contrast-enhanced ultrasound three-dimensional imaging. Results and Conclusion: Various ultrasound contrast agents differ in properties and designs of encapsulation. Microbubble enabled developing an image of ultrasound contrast and can play a role in transferring drugs. Novel microbubble contrast agents can provide blood perfusion information and target lesioned tissue to understand the mechanism of lesion to make the diagnosis of microbubble contrast agents more accurate. With developing preparation technique, microbubble contrast agents have good biocompatibility. They can be used for specific contrast-enhanced ultrasound imaging under various conditions, increase cell membrane permeability by carrying drugs or theoretical genes through transient cavatition erosion, and improve transfection efficiency of drugs or genes. Microbubble contrast would be developed to have multiple functions, such as treatment, diagnosis and ultrasonic imaging and become a safe, high-effective, non-invasive diagnostic and targeting transfer treatment tool. Source

Feng J.,CAS Institute of Electronics | Zheng H.,CAS Institute of Electronics | Zheng H.,University of Chinese Academy of Sciences | Deng Y.,CAS Institute of Electronics | Gao D.,Shenyang Military Region
IEEE Geoscience and Remote Sensing Letters | Year: 2012

Narrow-band interference (NBI) suppression is an important technique in the low-frequency synthetic aperture radar (SAR). NBI sources either intentional or unintentional can mask the SAR signals and cause image degradation. According to the different characteristics of the spectra between the NBI and the SAR signals, a new method using subband spectral cancellation is applied to suppress the NBI. In contrast to the conventional suppression method performed on the raw data, this letter deals with the focused SAR image. By subtracting different range subband spectra of the SAR image, the NBIs are obtained and cancelled. The proposed method does not need to detect and estimate the parameters of the NBI and is easy to put in practice. Its performance is tested on the real data acquired by an experimental SAR system at P-band. © 2006 IEEE. Source

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