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目的 :探讨不同辐射剂量行颅脑CT扫描对影像质量的影响。方法 :8例正常男性志愿者用 110～ 14 0kV ,180～ 36 0mAs分四组行轴位平扫 ;各影像按颗粒均匀性、脑灰白质细节、界面清晰度和有无射线硬化等积分评定质量。结果 :共扫描 192次 ,12 0kV、2 40mAs以上组影像质量均达优良 ;130kV、30 0mAs以上组优片率更高。结论 :采用适当辐射剂量 ( >12 0kV、2 40mAs)行颅脑CT扫描能提高密度分辨力 ,增加SNR ,改善影像质量
Objective: To investigate the effect of different doses of radiation on brain CT scan quality. Methods: Eight normal male volunteers underwent axial plain scan with four groups of 110 ~ 14 0kV and 180 ~ 36 0mAs. The images were graded according to the uniformity of the granules, the details of gray matter and white matter, the clarity of the interface and the presence or absence of radiation hardening quality. Results: A total of 192 scans were performed. The image quality of 120 kV and 240 mAs above groups were all excellent. The film yield of the group above 130 kV and 300 mAs was higher. CONCLUSIONS: Brain CT scanning with appropriate radiation doses (> 12 0 kV, 240 mAs) can improve density resolution, increase SNR, and improve image quality