目的：探讨能谱CT不同单能量水平对脑动脉造影图像质量的影响,以确定最优化的单能量图像。方法：采用能谱CT对53例患者行脑CT动脉造影（CTA）检查。应用能谱分析软件,以10 ke V间隔重建40~140 ke V单能量脑CTA图像。测量并计算基底动脉...目的：探讨能谱CT不同单能量水平对脑动脉造影图像质量的影响,以确定最优化的单能量图像。方法：采用能谱CT对53例患者行脑CT动脉造影（CTA）检查。应用能谱分析软件,以10 ke V间隔重建40~140 ke V单能量脑CTA图像。测量并计算基底动脉、颈内动脉颅内段、大脑前、中、后动脉图像对比噪声比（CNR）、信号噪声比（SNR）;采用5分法对脑CTA图像的主观质量进行盲法独立评分。分别采用单因素方差分析和非参数秩和检验对各单能量脑CTA图像的客观和主观质量进行比较评价。结果：图像客观质量比较,60、70 ke V脑CTA图像CNR、SNR值较其他各单能量图像显著增加（P〈0.05）,但60、70 ke V间差异无统计学意义（P〉0.05）。单能量脑CTA图像噪声以70 ke V为界,70~140 ke V图像噪声显著低于40、50、60 ke V单能量水平。而且70 ke V图像主观质量评分结果较60 ke V及其他各单能量图像评分结果显著增加。结论：能谱70 ke V水平单能量脑CTA图像兼顾图像CNR、SNR及图像噪声,可作为最优化单能量水平。展开更多
Background and Purpose:Transient elevation of arterial blood pressure (BP) is frequent in acute ischemic stroke and may help to increase perfusion of tissue jeopardized by ischemia.If this is true, recanalization may ...Background and Purpose:Transient elevation of arterial blood pressure (BP) is frequent in acute ischemic stroke and may help to increase perfusion of tissue jeopardized by ischemia.If this is true, recanalization may eliminate the need f or this BP elevation. Methods:We analyzed BP in 149 patients with acute ischemi c stroke on admission to the hospital and 1 and 12 hours after intraarterial thr ombolysis. BP values of patients with adequate recanalization were compared with BP values of patients with in adequate recanalization. Recanalization was deter mined on cerebral arteriography after thrombolysis using thrombolysis in myocard ial infarction grades. Results:Systolic,mean, and diastolic arterial BP decreas ed significantly from admission to 12 hours after thrombolysis in all patients(P < 0.001). Before thrombolysis, patients with adequate and inadequate recanaliza tion showed equal systolic (147.4 and 148.0 mm Hg), mean (102.1 and 104.1 mm Hg) , and diastolic(79.5 and 82.1 mm Hg) BP values. Twelve hours after thrombolysis, patients with adequate recanalization had lower values than those with inadequa te recanalization (systolic BP,130 versus 139.9 mm Hg; mean BP, 86.8 versus 92.2 mm Hg;and diastolic, BP 65.2 versus 68.3 mm Hg). Two-way repeated ANOVA analysis showed a significant group X time int eraction for systolic BP, indicating a larger systolic BP decrease when recanali zation succeeded (P=0.019). Conclusion:The course of elevated systolic but not diastolic BP after acute ischemicstroke was found to be inversely associated wit h the degree of vessel recanalization. When recanalization failed, systolic BP r emained elevated longer than when it succeeded.展开更多
文摘目的：探讨能谱CT不同单能量水平对脑动脉造影图像质量的影响,以确定最优化的单能量图像。方法：采用能谱CT对53例患者行脑CT动脉造影（CTA）检查。应用能谱分析软件,以10 ke V间隔重建40~140 ke V单能量脑CTA图像。测量并计算基底动脉、颈内动脉颅内段、大脑前、中、后动脉图像对比噪声比（CNR）、信号噪声比（SNR）;采用5分法对脑CTA图像的主观质量进行盲法独立评分。分别采用单因素方差分析和非参数秩和检验对各单能量脑CTA图像的客观和主观质量进行比较评价。结果：图像客观质量比较,60、70 ke V脑CTA图像CNR、SNR值较其他各单能量图像显著增加（P〈0.05）,但60、70 ke V间差异无统计学意义（P〉0.05）。单能量脑CTA图像噪声以70 ke V为界,70~140 ke V图像噪声显著低于40、50、60 ke V单能量水平。而且70 ke V图像主观质量评分结果较60 ke V及其他各单能量图像评分结果显著增加。结论：能谱70 ke V水平单能量脑CTA图像兼顾图像CNR、SNR及图像噪声,可作为最优化单能量水平。
文摘Background and Purpose:Transient elevation of arterial blood pressure (BP) is frequent in acute ischemic stroke and may help to increase perfusion of tissue jeopardized by ischemia.If this is true, recanalization may eliminate the need f or this BP elevation. Methods:We analyzed BP in 149 patients with acute ischemi c stroke on admission to the hospital and 1 and 12 hours after intraarterial thr ombolysis. BP values of patients with adequate recanalization were compared with BP values of patients with in adequate recanalization. Recanalization was deter mined on cerebral arteriography after thrombolysis using thrombolysis in myocard ial infarction grades. Results:Systolic,mean, and diastolic arterial BP decreas ed significantly from admission to 12 hours after thrombolysis in all patients(P < 0.001). Before thrombolysis, patients with adequate and inadequate recanaliza tion showed equal systolic (147.4 and 148.0 mm Hg), mean (102.1 and 104.1 mm Hg) , and diastolic(79.5 and 82.1 mm Hg) BP values. Twelve hours after thrombolysis, patients with adequate recanalization had lower values than those with inadequa te recanalization (systolic BP,130 versus 139.9 mm Hg; mean BP, 86.8 versus 92.2 mm Hg;and diastolic, BP 65.2 versus 68.3 mm Hg). Two-way repeated ANOVA analysis showed a significant group X time int eraction for systolic BP, indicating a larger systolic BP decrease when recanali zation succeeded (P=0.019). Conclusion:The course of elevated systolic but not diastolic BP after acute ischemicstroke was found to be inversely associated wit h the degree of vessel recanalization. When recanalization failed, systolic BP r emained elevated longer than when it succeeded.
