目的 探讨动态增强磁共振成像(Dynamic Contrast-Enhanced MRI,DCE-MRI)定量参数在子宫肌瘤患者下腹部皮下脂肪微循环特点研究中的应用价值。方法 收集71例接受高强度聚焦超声治疗的子宫肌瘤患者的术前DCE-MRI图像,采用盆腔轴位动态增强...目的 探讨动态增强磁共振成像(Dynamic Contrast-Enhanced MRI,DCE-MRI)定量参数在子宫肌瘤患者下腹部皮下脂肪微循环特点研究中的应用价值。方法 收集71例接受高强度聚焦超声治疗的子宫肌瘤患者的术前DCE-MRI图像,采用盆腔轴位动态增强LAVA序列进行感兴趣区(Region of Interest,ROI)勾画,取轴位上两侧髂结节所作结节间平面为初始层面进行测量,共测量3个平面,于各层面左右两侧分别进行测量,每例患者均测量18个ROI,计算各ROI皮下脂肪定量参数:容积转运常数(Volume Transfer Constant,Ktrans)、速率常数(Rate Constant,Kep)、血管外细胞外间隙容积分数(Extravascular Extracellular Space Volume Fraction Per Unit of Tissue Volume,Ve)以及血浆容积指数(Blood Plasma Volume Per Unit Volume of Tissue,Vp)。结果 每一层各点的Ktrans、Kep、Ve值差异有统计学意义(P<0.05),且均表现为:点1>点2>点3,两点间差异有统计学意义(P<0.05);L1、L2层的Vp值差异有统计学意义(P<0.05),R1~R3及L3层Vp值差异均无统计学意义。结论 DEC-MRI可以通过定量参数量化皮下脂肪微循环的情况,不同位置皮下脂肪微循环情况有差异,各层靠近腹部中心区域的微循环较外周区域丰富。展开更多
Unmanned aerial vehicle (UAV) target tracking tasks can currently be successfully completed in daytime situations with enough lighting, but they are unable to do so in nighttime scenes with inadequate lighting, poor c...Unmanned aerial vehicle (UAV) target tracking tasks can currently be successfully completed in daytime situations with enough lighting, but they are unable to do so in nighttime scenes with inadequate lighting, poor contrast, and low signal-to-noise ratio. This letter presents an enhanced low-light enhancer for UAV nighttime tracking based on Zero-DCE++ due to its ad-vantages of low processing cost and quick inference. We developed a light-weight UCBAM capable of integrating channel information and spatial features and offered a fully considered curve projection model in light of the low signal-to-noise ratio of night scenes. This method significantly improved the tracking performance of the UAV tracker in night situations when tested on the public UAVDark135 and compared to other cutting-edge low-light enhancers. By applying our work to different trackers, this search shows how broadly applicable it is.展开更多
文摘目的 探讨动态增强磁共振成像(Dynamic Contrast-Enhanced MRI,DCE-MRI)定量参数在子宫肌瘤患者下腹部皮下脂肪微循环特点研究中的应用价值。方法 收集71例接受高强度聚焦超声治疗的子宫肌瘤患者的术前DCE-MRI图像,采用盆腔轴位动态增强LAVA序列进行感兴趣区(Region of Interest,ROI)勾画,取轴位上两侧髂结节所作结节间平面为初始层面进行测量,共测量3个平面,于各层面左右两侧分别进行测量,每例患者均测量18个ROI,计算各ROI皮下脂肪定量参数:容积转运常数(Volume Transfer Constant,Ktrans)、速率常数(Rate Constant,Kep)、血管外细胞外间隙容积分数(Extravascular Extracellular Space Volume Fraction Per Unit of Tissue Volume,Ve)以及血浆容积指数(Blood Plasma Volume Per Unit Volume of Tissue,Vp)。结果 每一层各点的Ktrans、Kep、Ve值差异有统计学意义(P<0.05),且均表现为:点1>点2>点3,两点间差异有统计学意义(P<0.05);L1、L2层的Vp值差异有统计学意义(P<0.05),R1~R3及L3层Vp值差异均无统计学意义。结论 DEC-MRI可以通过定量参数量化皮下脂肪微循环的情况,不同位置皮下脂肪微循环情况有差异,各层靠近腹部中心区域的微循环较外周区域丰富。
文摘Unmanned aerial vehicle (UAV) target tracking tasks can currently be successfully completed in daytime situations with enough lighting, but they are unable to do so in nighttime scenes with inadequate lighting, poor contrast, and low signal-to-noise ratio. This letter presents an enhanced low-light enhancer for UAV nighttime tracking based on Zero-DCE++ due to its ad-vantages of low processing cost and quick inference. We developed a light-weight UCBAM capable of integrating channel information and spatial features and offered a fully considered curve projection model in light of the low signal-to-noise ratio of night scenes. This method significantly improved the tracking performance of the UAV tracker in night situations when tested on the public UAVDark135 and compared to other cutting-edge low-light enhancers. By applying our work to different trackers, this search shows how broadly applicable it is.
