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小波包变换在正电子发射断层扫描仪图像重建中的应用
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作者 吴朝霞 程敬之 《西安交通大学学报》 EI CAS CSCD 北大核心 2001年第12期1292-1295,共4页
在对常用的计算机断层图像重建方法———解析法深入研究的基础上 ,将小波包技术应用于断层图像重建 ,提出了基于小波包变换的多尺度断层图像重建框架 .该方法能够直接从投影数据的多尺度表达中计算出目标多尺度表达系数 ,可在提取重建... 在对常用的计算机断层图像重建方法———解析法深入研究的基础上 ,将小波包技术应用于断层图像重建 ,提出了基于小波包变换的多尺度断层图像重建框架 .该方法能够直接从投影数据的多尺度表达中计算出目标多尺度表达系数 ,可在提取重建图像多分辨信息的同时 ,保留传统滤波反投影法的简便性和有效性 .计算机仿真模型和临床正电子发射断层扫描仪投影数据的重建结果表明 ,该方法和滤波反投影方法相比 ,在不增加计算量的基础上 ,能够对任意不同频段的信号进行较为精确的重建 。 展开更多
关键词 小波包变换 正电子发射断层扫描仪 图像重建 医疗诊断成像 核医学技术 解析法
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A smartphone-based calibration-free portable urinalysis device
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作者 GUO Dong LI Gen +1 位作者 MIAO Jia-qi SHEN Ya-jing 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第12期3829-3837,共9页
As one of the most common medical diagnosis methods, urinalysis is a highly demanded technique for screening tests or daily monitoring of various diseases. With the rapid development of POC(point-of-care) systems, a c... As one of the most common medical diagnosis methods, urinalysis is a highly demanded technique for screening tests or daily monitoring of various diseases. With the rapid development of POC(point-of-care) systems, a convenient house-using urinalysis device is widely needed. However, considering the difference of onboard systems and multiple test indicators in urinalysis, the design of such an intelligent device is still challenging. In this paper, a smartphone-based portable urinalysis system has been developed and applied for the colorimetric analysis of routine urine examination indices using an Android app. By integrating the test paper sensor in the portable device for urinalysis,our system significantly improves the instability of conventional dipstick-based manual colorimetry, and the smartphone application used for color discrimination enhances the accuracy of the visual assessment of sample strips. Using a simple operation approach that takes ~ 2 min per test, our system can be applied as rapid urinalysis for routine check-ups. 展开更多
关键词 urinalysis device COLORIMETRY diagnostic imaging POINT-OF-CARE SMARTPHONE
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