Positron emission tomography （PET） using 18F-fluorodeoxyglucose （FDG） has not been widely used in China for expensive cost （$1200）. Dual-head coincidence single photon emission computed tomography （DHC-SPECT） ...Positron emission tomography （PET） using 18F-fluorodeoxyglucose （FDG） has not been widely used in China for expensive cost （$1200）. Dual-head coincidence single photon emission computed tomography （DHC-SPECT） can depict many of the lesions depicted with a PET scanner in the lungs, which is used in place of PET-CT for discriminating malignant from benign pulmonary nodules in many studies. However, DHC-SPECT has inevitable false-negative results because the sensitivity for small lesions less than 2.0 cm is limited, and has high false-positive rate for active inflammatory nodules. Furthermore,DHC-SPECT also has a considerably higher cost （$300 in China） than other imaging examination.展开更多
Signal degradation due to physical impairments may result in unacceptable bit-error rates of received signals at the destination. Based on earlier work, we study the impairment-aware quality of service （QoS） provisi...Signal degradation due to physical impairments may result in unacceptable bit-error rates of received signals at the destination. Based on earlier work, we study the impairment-aware quality of service （QoS） provisioning problem in dual-header optical burst switching （OBS） networks that employ two control packets for each data burst. At an OBS node, the proposed algorithm schedule bursts for transmission by searching for available resources using admission control and preemption. The algorithm also verifies signal quality. Simulation results show that this algorithm is effective in providing QoS support in OBS networks while considering physical impairment effects.展开更多
背景与目的 正确的诊断对肺癌疑似患者是至关重要的。根据肿瘤组织摄取18 F FDG的能力远大于正常组织的原理,本研究探讨了双探头符合线路SPECT/CT在肺癌诊断中的临床应用价值。方法 对61例肺部肿块患者进行18F FDG SPECT/CT检查,对良...背景与目的 正确的诊断对肺癌疑似患者是至关重要的。根据肿瘤组织摄取18 F FDG的能力远大于正常组织的原理,本研究探讨了双探头符合线路SPECT/CT在肺癌诊断中的临床应用价值。方法 对61例肺部肿块患者进行18F FDG SPECT/CT检查,对良恶性肿块的摄取比值R进行比较,并与CT检查和病理检查结果进行比较。结果 以摄取比值R≥2 为标准,18 F FDG SPECT/CT对肺癌诊断的敏感性为82%,特异度为87%,准确率为84%。18 F FDG SPECT/CT对纵隔淋巴结转移的诊断与病理结果的符合率为81%,而CT诊断与病理结果的符合率为52%,二者有显著性差异(P<0.05)。结论 18 F FDG SPECT/CT对肺癌的诊断与鉴别诊断以及临床分期有重要的应用价值。展开更多
文摘Positron emission tomography （PET） using 18F-fluorodeoxyglucose （FDG） has not been widely used in China for expensive cost （$1200）. Dual-head coincidence single photon emission computed tomography （DHC-SPECT） can depict many of the lesions depicted with a PET scanner in the lungs, which is used in place of PET-CT for discriminating malignant from benign pulmonary nodules in many studies. However, DHC-SPECT has inevitable false-negative results because the sensitivity for small lesions less than 2.0 cm is limited, and has high false-positive rate for active inflammatory nodules. Furthermore,DHC-SPECT also has a considerably higher cost （$300 in China） than other imaging examination.
基金supported in part by the National "973" Program of China under Grant No. 2009CB326203
文摘Signal degradation due to physical impairments may result in unacceptable bit-error rates of received signals at the destination. Based on earlier work, we study the impairment-aware quality of service （QoS） provisioning problem in dual-header optical burst switching （OBS） networks that employ two control packets for each data burst. At an OBS node, the proposed algorithm schedule bursts for transmission by searching for available resources using admission control and preemption. The algorithm also verifies signal quality. Simulation results show that this algorithm is effective in providing QoS support in OBS networks while considering physical impairment effects.
文摘背景与目的 正确的诊断对肺癌疑似患者是至关重要的。根据肿瘤组织摄取18 F FDG的能力远大于正常组织的原理,本研究探讨了双探头符合线路SPECT/CT在肺癌诊断中的临床应用价值。方法 对61例肺部肿块患者进行18F FDG SPECT/CT检查,对良恶性肿块的摄取比值R进行比较,并与CT检查和病理检查结果进行比较。结果 以摄取比值R≥2 为标准,18 F FDG SPECT/CT对肺癌诊断的敏感性为82%,特异度为87%,准确率为84%。18 F FDG SPECT/CT对纵隔淋巴结转移的诊断与病理结果的符合率为81%,而CT诊断与病理结果的符合率为52%,二者有显著性差异(P<0.05)。结论 18 F FDG SPECT/CT对肺癌的诊断与鉴别诊断以及临床分期有重要的应用价值。
