目的探讨核磁共振成像(MRI)在功能性不稳踝关节损伤中的诊断价值。方法随机选择本院收治的踝关节损伤者45例为研究组,选择同期收治的45例患有其他足部疾病(排除踝关节损伤)患者为对照组。对各组患者进行MRI检查,并通过测量轴向踝指数、...目的探讨核磁共振成像(MRI)在功能性不稳踝关节损伤中的诊断价值。方法随机选择本院收治的踝关节损伤者45例为研究组,选择同期收治的45例患有其他足部疾病(排除踝关节损伤)患者为对照组。对各组患者进行MRI检查,并通过测量轴向踝指数、踝间指数、踝距指数观察患者距骨和腓骨位置。结果经MRI检查结果显示,研究组中检出距骨软骨损伤的有16例,软骨骨折伴周围组织水肿的有8例,腓骨肌腱损伤有11例,韧带损伤有7例,跟腱断裂有3例。研究组轴向踝指数(11.15±1.14 vs 7.69±1.88)、踝距指数(88.94±10.21 vs 84.32±10.39)明显高于对照组,差异有统计学意义(P<0.05),两组踝间指数比较差异无统计学意义(P>0.05)。结论 MRI检查对关节软组织损伤,尤其是韧带、肌肉、肌腱、软骨等具有较高敏感性。功能性不稳踝关节损伤患者存在距骨内旋现象,但腓骨在踝穴内的位置未发生改变。展开更多
general method for constructing radial basis function (RBF) and a mul-tiscale approximate formula of an arbitrary function in L2(Rn) based on RBFexpansion are proposed. Two radial basis functions are introduced as exa...general method for constructing radial basis function (RBF) and a mul-tiscale approximate formula of an arbitrary function in L2(Rn) based on RBFexpansion are proposed. Two radial basis functions are introduced as examples.They are not only infinitely differentiable but also locally supported. As appli-cations in image processing, they are used for both edge detection and noisesreduction respectively. The computational complexity of the corresponding algo-rithms is O(N2) for N × N images, a linear order of the piXel number, which issignificantly better than that of O(N2 log N) using the preconditioned conjugategradient iterative algorithm for handling leaJst squares problem. The denoisingalgorithm given here can be implemented using less storage and computation thanthe orthogonal least squares learning algorithm. The test results show that theRBF with local support is suited to design fast algorithms in image processing.展开更多
文摘目的探讨核磁共振成像(MRI)在功能性不稳踝关节损伤中的诊断价值。方法随机选择本院收治的踝关节损伤者45例为研究组,选择同期收治的45例患有其他足部疾病(排除踝关节损伤)患者为对照组。对各组患者进行MRI检查,并通过测量轴向踝指数、踝间指数、踝距指数观察患者距骨和腓骨位置。结果经MRI检查结果显示,研究组中检出距骨软骨损伤的有16例,软骨骨折伴周围组织水肿的有8例,腓骨肌腱损伤有11例,韧带损伤有7例,跟腱断裂有3例。研究组轴向踝指数(11.15±1.14 vs 7.69±1.88)、踝距指数(88.94±10.21 vs 84.32±10.39)明显高于对照组,差异有统计学意义(P<0.05),两组踝间指数比较差异无统计学意义(P>0.05)。结论 MRI检查对关节软组织损伤,尤其是韧带、肌肉、肌腱、软骨等具有较高敏感性。功能性不稳踝关节损伤患者存在距骨内旋现象,但腓骨在踝穴内的位置未发生改变。
文摘general method for constructing radial basis function (RBF) and a mul-tiscale approximate formula of an arbitrary function in L2(Rn) based on RBFexpansion are proposed. Two radial basis functions are introduced as examples.They are not only infinitely differentiable but also locally supported. As appli-cations in image processing, they are used for both edge detection and noisesreduction respectively. The computational complexity of the corresponding algo-rithms is O(N2) for N × N images, a linear order of the piXel number, which issignificantly better than that of O(N2 log N) using the preconditioned conjugategradient iterative algorithm for handling leaJst squares problem. The denoisingalgorithm given here can be implemented using less storage and computation thanthe orthogonal least squares learning algorithm. The test results show that theRBF with local support is suited to design fast algorithms in image processing.
