目的 研究成人高血压性脑出血患者颅脑CT低剂量扫描的可行性.方法 50例高血压性脑出血患者,使用Neuviz Bual双排螺旋CT机,初诊时行管电压120KV,管电流常规剂量260mAs.复查时使用120KV,低剂量组采用140mAs、100mAs及80mAs行全颅脑扫描,并对扫描的图像进行优良率、噪声值评价,比较图像质量.结果 常规剂量与低剂量图像质量优良率比较,差异无统计学意义(P＞0.05).采用80mAs低剂量扫描时噪声值为5.62 +0.56,常规剂量噪声值为3.12 +0.26,两种剂量噪声值比较,差异有统计学意义(P＜0.05).低剂量组140 mAs、100 mAs及80 mAs与常规剂量扫描序列辐射剂量比较剂量明显降低.低剂量(80mAs)组完成的病人CT图像仍可以满足诊断要求.结论 对高血压性脑出血复查的患者进行低剂量扫描是可行的.即第一次颅脑CT扫描图像用常规剂量,患者复查可以酌情使用140 mAs、100 mAs及80mAs.%Objective To study the feasibility of low dose scaning by helical CT for patients with cerebral hemorrhage of hypertension. Methods 50 patients with cerebral hemorrhage of hypertension received conventional dose CT scanning. The first time CT scanning for dignosis using 120Kv, 260mAs, then reviewed CT using low dose CT scanning ( 120Kv,140, 100, 80mAs) ,the differences of qualitative diagnosis for lesions and radiation dose were observed and compared. Results There was no significant difference in quantitative diagnosis and qualitative diagnosis for lesions between conventional dose CT scanning and low dose CT (P >0. 05) ,but the noise was higher in 80mas group than in conventional dose group(5. 62 ±0. 56,3. 12 ±0. 26,P <0, 05) , however the radiation dose of low dose CT scanning decreased significantly. Conclusion Low dose CT scanning technique is suitable for examination the patients with cerebral hemorrhage of hypertension, which is helpful to radioprotection.
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