A localized parametric time-sheared Gabor atom is derived by convolving a linear frequency modulated factor, modulating in frequency and translating in time to a dilated Gaussian function, which is the generalization ...A localized parametric time-sheared Gabor atom is derived by convolving a linear frequency modulated factor, modulating in frequency and translating in time to a dilated Gaussian function, which is the generalization of Gabor atom and is more delicate for matching most of the signals encountered in practice, especially for those having frequency dispersion characteristics. The time-frequency distribution of this atom concentrates in its time center and frequency center along energy curve, with the curve being oblique to a certain extent along the time axis. A novel parametric adaptive time-frequency distribution based on a set of the derived atoms is then proposed using a adaptive signal subspace decomposition method in frequency domain, which is non-negative time-frequency energy distribution and free of cross-term interference for multicomponent signals. The results of numerical simulation manifest the effectiveness of the approach in time-frequency representation and signal de-noising processing.展开更多
目的:观察实时剪切波弹性成像(Sensor Web Enablement,SWE)技术与二维超声技术在桥本甲状腺炎背景下甲状腺癌中的联合诊断效能。方法:选取我院2022年1月至2023年12月收治的80例甲状腺结节且伴桥本甲状腺炎患者,均行二维超声、SWE检查,...目的:观察实时剪切波弹性成像(Sensor Web Enablement,SWE)技术与二维超声技术在桥本甲状腺炎背景下甲状腺癌中的联合诊断效能。方法:选取我院2022年1月至2023年12月收治的80例甲状腺结节且伴桥本甲状腺炎患者,均行二维超声、SWE检查,分析二维超声与SWE联合诊断价值。结果:病理结果示80例患者共检出80个结节,其中良性52个,恶性28个;联合诊断灵敏度、准确率均明显高于SWE或二维超声(P<0.05);二维超声联合SWE技术的曲线下面积(Area Under the Curve,AUC)最大。结论:二维超声联合SWE在桥本甲状腺炎背景下甲状腺癌患者中诊断效能较高,可同时开展二维超声与SWE技术检查,以提高甲状腺癌的检出。展开更多
基金This project was supported by the National Natural Science Foundation of China (60472102)Shanghai Leading Academic Discipline Project (T0103).
文摘A localized parametric time-sheared Gabor atom is derived by convolving a linear frequency modulated factor, modulating in frequency and translating in time to a dilated Gaussian function, which is the generalization of Gabor atom and is more delicate for matching most of the signals encountered in practice, especially for those having frequency dispersion characteristics. The time-frequency distribution of this atom concentrates in its time center and frequency center along energy curve, with the curve being oblique to a certain extent along the time axis. A novel parametric adaptive time-frequency distribution based on a set of the derived atoms is then proposed using a adaptive signal subspace decomposition method in frequency domain, which is non-negative time-frequency energy distribution and free of cross-term interference for multicomponent signals. The results of numerical simulation manifest the effectiveness of the approach in time-frequency representation and signal de-noising processing.
文摘目的:观察实时剪切波弹性成像(Sensor Web Enablement,SWE)技术与二维超声技术在桥本甲状腺炎背景下甲状腺癌中的联合诊断效能。方法:选取我院2022年1月至2023年12月收治的80例甲状腺结节且伴桥本甲状腺炎患者,均行二维超声、SWE检查,分析二维超声与SWE联合诊断价值。结果:病理结果示80例患者共检出80个结节,其中良性52个,恶性28个;联合诊断灵敏度、准确率均明显高于SWE或二维超声(P<0.05);二维超声联合SWE技术的曲线下面积(Area Under the Curve,AUC)最大。结论:二维超声联合SWE在桥本甲状腺炎背景下甲状腺癌患者中诊断效能较高,可同时开展二维超声与SWE技术检查,以提高甲状腺癌的检出。
