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影响唾液腺功能ROI分析的技术因素 被引量:7
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作者 杨小春 樊卫 +1 位作者 张伟光 戴军进 《现代临床医学生物工程学杂志》 2005年第1期23-25,33,共4页
目的 通过分析鼻咽癌患者腮腺和颌下腺的时间—放射性曲线的形态探讨影响唾液腺功能分析的技术因素.方法 对4 5 0例次鼻咽低分化鳞癌患者放疗前、放疗后行唾液腺功能显像,显像剂为99mTc -高锝酸钠,剂量370MBq ,静脉“弹丸”注射后以6 ... 目的 通过分析鼻咽癌患者腮腺和颌下腺的时间—放射性曲线的形态探讨影响唾液腺功能分析的技术因素.方法 对4 5 0例次鼻咽低分化鳞癌患者放疗前、放疗后行唾液腺功能显像,显像剂为99mTc -高锝酸钠,剂量370MBq ,静脉“弹丸”注射后以6 0秒/帧,连续动态采集32帧,至2 0帧时给患者服食维生素C片2 0 0mg进行酸刺激,用ROI技术得出时间—放射性曲线,分析其摄取及排泌功能.结果 正常时间-放射性曲线呈平滑的坪曲线型,10~2 0min达到坪值,酸刺激后迅速下降,有176例,异常的时间-放射性曲线不平滑,酸刺激后下降不明显或出现异常变化,有2 74例,根据功能和形态的不同可将异常曲线分为抛物线型、水平型、双峰型和锯齿型,分别有16 2例、10 7例、5例、12 3例,结合临床与检查过程分析,抛物线型和水平型曲线多数由于腺体放射性损伤引起,双峰型曲线由于静脉注射渗漏引起,而锯齿型曲线多与患者精神状况和体位改变有关.结论 唾液腺功能动态显像过程中各种技术因素对唾液腺显像的时间—放射性曲线的形态和变化均有影响,对其进行分析与总结,可帮助提高图像结果的准确性,保证评估结果可靠. 展开更多
关键词 唾液腺功能 核素显像 ROI分析
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Retrieval of flower videos based on a query with multiple species of flowers
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作者 V.K.Jyothi V.N.Manjunath Aradhya +1 位作者 Y.H.Sharath Kumar D.S.Guru 《Artificial Intelligence in Agriculture》 2021年第1期262-277,共16页
Searching,recognizing and retrieving a video of interest froma large collection of a video data is an instantaneous requirement.This requirement has been recognized as an active area of research in computer vision,mac... Searching,recognizing and retrieving a video of interest froma large collection of a video data is an instantaneous requirement.This requirement has been recognized as an active area of research in computer vision,machine learning and pattern recognition.Flower video recognition and retrieval is vital in the field of floriculture and horticulture.In this paper we propose a model for the retrieval of videos of flowers.Initially,videos are represented with keyframes and flowers in keyframes are segmented from their background.Then,the model is analysed by features extracted from flower regions of the keyframe.A Linear Discriminant Analysis(LDA)is adapted for the extraction of discriminating features.Multiclass Support VectorMachine(MSVM)classifier is applied to identify the class of the query video.Experiments have been conducted on relatively large dataset of our own,consisting of 7788 videos of 30 different species of flowers captured from three different devices.Generally,retrieval of flower videos is addressed by the use of a query video consisting of a flower of a single species.In this work we made an attempt to develop a system consisting of retrieval of similar videos for a query video consisting of flowers of different species. 展开更多
关键词 Flower region of interest(froi) Linear discriminant analysis(LDA) Retrieval of flower videos Multiclass support vector machine
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