脑微出血(cerebral microbleeds,CMBs)是临床上常见的脑小血管疾病。该病的发生与各种神经功能缺损有关。由于CMBs患者多无典型的临床症状和体征,对其进行CT检查和磁共振成像(Nuclear Magnetic Resonance Imaging,MRI)检查难以发现其病...脑微出血(cerebral microbleeds,CMBs)是临床上常见的脑小血管疾病。该病的发生与各种神经功能缺损有关。由于CMBs患者多无典型的临床症状和体征,对其进行CT检查和磁共振成像(Nuclear Magnetic Resonance Imaging,MRI)检查难以发现其病灶,故其病情易被漏诊。磁共振敏感加权成像(susceptibilityweightedimaging,SWI)技术是一种新型的磁共振成像技术。本文就SWI技术在CMBs诊断中的应用价值进行综述。展开更多
With all driving fields on Raman resonance, a tripod-type atomic system quickly evolves into a dark state decoupled from the lossy excited level. The dark state depends strongly on field Rabi frequencies, spontaneous ...With all driving fields on Raman resonance, a tripod-type atomic system quickly evolves into a dark state decoupled from the lossy excited level. The dark state depends strongly on field Rabi frequencies, spontaneous decay rates, and the initial atomic population in a complicated way. Analytical results reveal that it is a sixfold degenerate dark state with its three components superposed both coherently and incoherently due to population redistribution from spontaneous emission.展开更多
文摘脑微出血(cerebral microbleeds,CMBs)是临床上常见的脑小血管疾病。该病的发生与各种神经功能缺损有关。由于CMBs患者多无典型的临床症状和体征,对其进行CT检查和磁共振成像(Nuclear Magnetic Resonance Imaging,MRI)检查难以发现其病灶,故其病情易被漏诊。磁共振敏感加权成像(susceptibilityweightedimaging,SWI)技术是一种新型的磁共振成像技术。本文就SWI技术在CMBs诊断中的应用价值进行综述。
基金Supported by the National Natural Science Foundation of China under Grant Nos 10334010 and 10404009.
文摘With all driving fields on Raman resonance, a tripod-type atomic system quickly evolves into a dark state decoupled from the lossy excited level. The dark state depends strongly on field Rabi frequencies, spontaneous decay rates, and the initial atomic population in a complicated way. Analytical results reveal that it is a sixfold degenerate dark state with its three components superposed both coherently and incoherently due to population redistribution from spontaneous emission.
