目的探讨3.0T磁共振弥散加权成像(DWI)结合液体衰减翻转恢复(FLAIR)序列、三维动脉自旋标记成像(3D ASL)双不匹配技术对不明发病时间急性脑梗死(ACI)患者的应用价值。方法选取我院进行3.0T磁共振DWI、FLAIR、3D ASL、磁共振血管成像(MRA...目的探讨3.0T磁共振弥散加权成像(DWI)结合液体衰减翻转恢复(FLAIR)序列、三维动脉自旋标记成像(3D ASL)双不匹配技术对不明发病时间急性脑梗死(ACI)患者的应用价值。方法选取我院进行3.0T磁共振DWI、FLAIR、3D ASL、磁共振血管成像(MRA)扫描的不明时间窗的急性脑梗死患者35例,并同时满足DWI高信号且FLAIR在相应的DWI高信号区未显影及DWI高信号、3D ASL存在灌注减低区且灌注减低区/DWI高信号区>1.2双不匹配,并存在大血管闭塞患者。同时选取明确发病时间窗内(<4.5 h)急性脑梗死患者35例,进行再灌注治疗。比较两组患者治疗前及治疗后24 h NIHSS评分、两组90 d mRS评分及颅内出血的发生率。结果双不匹配组与明确时间窗组治疗前后24 h NIHSS评分比较有显著性差异(P<0.05)。90 d mRS比较无显著性差异(P>0.05)。结论DWI-FLAIR、DWI-3D ASL双不匹配可作为不明发病时间急性脑梗死患者发病时间、缺血半暗带及再灌注情况的有效评估手段,为静脉溶栓、桥接治疗以及保守治疗提供依据。展开更多
Chromatic adaptation of human eyes to complex field is investigated using binocular asymmetric matching method. The results show that the leve of chromatic adapta- tion mainly depends on the average color of adapting ...Chromatic adaptation of human eyes to complex field is investigated using binocular asymmetric matching method. The results show that the leve of chromatic adapta- tion mainly depends on the average color of adapting field, whereas no obvious change oc- curs when the number of hues and their color differences vary in a complex field. The shifts of perceived color evoked by chromatic adaptation in CIE 1976 L U V color space are approximately proportional to the average color difference between the adapting field and reference field.展开更多
文摘目的探讨3.0T磁共振弥散加权成像(DWI)结合液体衰减翻转恢复(FLAIR)序列、三维动脉自旋标记成像(3D ASL)双不匹配技术对不明发病时间急性脑梗死(ACI)患者的应用价值。方法选取我院进行3.0T磁共振DWI、FLAIR、3D ASL、磁共振血管成像(MRA)扫描的不明时间窗的急性脑梗死患者35例,并同时满足DWI高信号且FLAIR在相应的DWI高信号区未显影及DWI高信号、3D ASL存在灌注减低区且灌注减低区/DWI高信号区>1.2双不匹配,并存在大血管闭塞患者。同时选取明确发病时间窗内(<4.5 h)急性脑梗死患者35例,进行再灌注治疗。比较两组患者治疗前及治疗后24 h NIHSS评分、两组90 d mRS评分及颅内出血的发生率。结果双不匹配组与明确时间窗组治疗前后24 h NIHSS评分比较有显著性差异(P<0.05)。90 d mRS比较无显著性差异(P>0.05)。结论DWI-FLAIR、DWI-3D ASL双不匹配可作为不明发病时间急性脑梗死患者发病时间、缺血半暗带及再灌注情况的有效评估手段,为静脉溶栓、桥接治疗以及保守治疗提供依据。
文摘Chromatic adaptation of human eyes to complex field is investigated using binocular asymmetric matching method. The results show that the leve of chromatic adapta- tion mainly depends on the average color of adapting field, whereas no obvious change oc- curs when the number of hues and their color differences vary in a complex field. The shifts of perceived color evoked by chromatic adaptation in CIE 1976 L U V color space are approximately proportional to the average color difference between the adapting field and reference field.
