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Application of multishot diffusion tensor imaging in spinal cord tumors 被引量:1
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作者 Jiefei Li Le He Yuqi Zhang 《Brain Science Advances》 2019年第1期59-64,共6页
Objective:To explore the usefulness of multishot diffusion tensor imaging(DTI)for evaluating the neurological function of patients with spinal cord tumors Methods:Routine magnetic resonance imaging and multishot DTI w... Objective:To explore the usefulness of multishot diffusion tensor imaging(DTI)for evaluating the neurological function of patients with spinal cord tumors Methods:Routine magnetic resonance imaging and multishot DTI were performed in five patients with spinal cord tumors.The values of fractional anisotropy(FA)and radial diffusivity(RD)were analyzed.Results:Multishot DTI of spinal cord tumors allowed for defining the margins of tumors and determining the relationship of tumors with the adjacent white matter structures of the spinal cord.Multishot DTI demonstrated significantly increased RD and decreased FA of spinal cord tumors compared with those of the normal spinal cord.Conclusions:Multishot DTI is a potentially useful modality for differentiating resectable tumors from nonresectable ones based on preoperative imaging alone as well as for differentiating intramedullary tumors from extramedullary ones.Further prospective studies are warranted to confirm these results. 展开更多
关键词 diffusion TENSOR imaging(DTI) SPINAL CORD TUMOR magnetic resonance IMAGING multishot DTI
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MUSE-IVIM与非对比增强T1 mapping定量参数对肝癌经导管动脉化疗栓塞疗效的预测价值
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作者 董亚宁 朱菊芳 +3 位作者 段金辉 任继鹏 毛珂 韩东明 《医学影像学杂志》 2025年第6期82-86,共5页
目的探讨基于复合灵敏度编码的体素不相干运动(MUSE-IVIM)与非对比增强T1 mapping定量参数对肝癌经导管动脉化疗栓塞(TACE)疗效的预测价值。方法选取原发性肝癌患者64例,TACE治疗后随访3~6个月,根据改良实体瘤疗效评估标准分为良好反应... 目的探讨基于复合灵敏度编码的体素不相干运动(MUSE-IVIM)与非对比增强T1 mapping定量参数对肝癌经导管动脉化疗栓塞(TACE)疗效的预测价值。方法选取原发性肝癌患者64例,TACE治疗后随访3~6个月,根据改良实体瘤疗效评估标准分为良好反应组28例、较差反应组36例。TACE治疗前1~2周行MUSE-IVIM及T1 mapping扫描,获取MUSE-IVIM定量参数标准表观扩散系数(standard ADC)值、慢速表观扩散系数(slow ADC)值、快速表观扩散系数(fast ADC)值以及灌注分数(f)值、水分子扩散分布指数(DDC)值和扩散异质性指数(α)值,T1 mapping定量参数初始瘤内与瘤周纵向弛豫时间(T1)值。比较两组MUSE-IVIM及T1 mapping定量参数,采用多因素Logistic回归模型筛选与肝癌TACE疗效相关的危险因素,预测效能评估采用受试者工作特征(ROC)曲线。结果两组MUSE-IVIM定量参数standard ADC值和slow ADC值比较差异均有统计学意义(P均<0.05),而MUSE-IVIM定量参数fast ADC值、f值、DDC值、α值及初始瘤内T1值、初始瘤周T1值比较差异均无统计学意义(P均>0.05)。多因素Logistic回归分析发现standard ADC值、slow ADC值均为预测肝癌TACE疗效的独立危险因素(P均<0.05)。ROC曲线分析显示standard ADC值、slow ADC值及二者联合预测肝癌TACE疗效的曲线下面积(AUC)分别为0.85、0.86、0.89,虽然显示standard ADC值、slow ADC值联合预测肝癌TACE疗效的AUC高于二者单独,但其比较差异无统计学意义(P均>0.05)。结论MUSE-IVIM定量参数standard ADC值和slow ADC值对肝癌TACE疗效具有较好的预测价值,而非对比增强T1 mapping技术不能很好地预测肝癌TACE疗效。 展开更多
关键词 磁共振成像 基于复合灵敏度编码的体素不相干运动成像 非对比增强T1 mapping成像 肝癌 经导管动脉化疗栓塞术
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HL-1M装置8发弹丸发射系统的研制及特性 被引量:11
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作者 肖正贵 孙文哲 +7 位作者 刘德权 李波 李立 徐小桥 王明健 钟平 黄勇 兰亚明 《真空与低温》 1997年第1期12-16,共5页
用于HL-1M装置的8发弹丸发射系统已研制成功。经全面的工程调试后系统已在HL-1M托卡马克装置上进行了国内核聚变研究中首次多发固体氢丸加料。本系统能制造和发射尺寸为φ1.0mm×L1.0~1.3mm和φ1.4m... 用于HL-1M装置的8发弹丸发射系统已研制成功。经全面的工程调试后系统已在HL-1M托卡马克装置上进行了国内核聚变研究中首次多发固体氢丸加料。本系统能制造和发射尺寸为φ1.0mm×L1.0~1.3mm和φ1.4mm×L1.4~1.8mm氢、氘弹丸各4发,推进剂压力4~6MPa时丸速为700~1200m/s,冻丸周期2~3min,8发弹丸可按事先设定程序自动生成和发射。其成功率和重复性优于90%。 展开更多
关键词 托卡马克装置 弹丸发射系统 低温换热器
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Image Captioning Using Detectors and Swarm Based Learning Approach for Word Embedding Vectors
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作者 B.Lalitha V.Gomathi 《Computer Systems Science & Engineering》 SCIE EI 2023年第1期173-189,共17页
IC(Image Captioning)is a crucial part of Visual Data Processing and aims at understanding for providing captions that verbalize an image’s important elements.However,in existing works,because of the complexity in ima... IC(Image Captioning)is a crucial part of Visual Data Processing and aims at understanding for providing captions that verbalize an image’s important elements.However,in existing works,because of the complexity in images,neglecting major relation between the object in an image,poor quality image,labelling it remains a big problem for researchers.Hence,the main objective of this work attempts to overcome these challenges by proposing a novel framework for IC.So in this research work the main contribution deals with the framework consists of three phases that is image understanding,textual understanding and decoding.Initially,the image understanding phase is initiated with image pre-pro-cessing to enhance image quality.Thereafter,object has been detected using IYV3MMDs(Improved YoloV3 Multishot Multibox Detectors)in order to relate the interrelation between the image and the object,and then it is followed by MBFOCNNs(Modified Bacterial Foraging Optimization in Convolution Neural Networks),which encodes and providesfinal feature vectors.Secondly,the tex-tual understanding phase is performed based on an image which is initiated with preprocessing of text where unwanted words,phrases,punctuations are removed in order to provide a healthy text.It is then followed by MGloVEs(Modified Glo-bal Vectors for Word Representation),which provides a word embedding of fea-tures with the highest priority towards the object present in an image.Finally,the decoding phase has been performed,which decodes the image whether it may be a normal or complex scene image and provides an accurate text by its learning ability using MDAA(Modified Deliberate Adaptive Attention).The experimental outcome of this work shows better accuracy of shows 96.24%when compared to existing and similar methods while generating captions for images. 展开更多
关键词 DENOISING improved YoloV3 multishot multibox detector
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MMT电子多点测斜仪在川渝地区的推广应用
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作者 胡超 王平 《钻采工艺》 CAS 2003年第2期54-54,78,共2页
MMT电子多点测斜仪是一种先进的数字化的测斜仪器 ,它能够在起钻过程中自动测量井眼井斜、方位 ,且测量精度高 ,操作简单 ,使用成本低 ,节约测井时间 ,重复性好的特点 ,是钻井工程测斜较理想的一种仪器。通过技术可行性和经济可行性两... MMT电子多点测斜仪是一种先进的数字化的测斜仪器 ,它能够在起钻过程中自动测量井眼井斜、方位 ,且测量精度高 ,操作简单 ,使用成本低 ,节约测井时间 ,重复性好的特点 ,是钻井工程测斜较理想的一种仪器。通过技术可行性和经济可行性两方面分析 ,在川渝地区推广应用MMT电子多点测斜仪测斜 ,不仅增加了钻井现场井身质量监控的手段 ,而且可缩短钻井周期 。 展开更多
关键词 MMT电子多点测斜仪 原理 经济效益 应用
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