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就Sensation 16而言,LD扫描选用120kV,准直 1.5mm,0.5s/圈,重建层厚与间隔4mm,预设 20emAs,床进24mm或36mm扫描,CT图像质量好、发现肺结节敏感性高,但螺距1.5(床进36mm)比螺距1(床进24mm)的扫描时间短,故选择螺距1.5(床进36mm)扫描更适宜;LD扫描发现肺结节的敏感性较高,可用于肺结节随诊、筛查肺癌。




图1,2分别为同一层面的常规剂量与低剂量CT,可见少量伪影,不影响观察肺结节图3,4分别为同一层面的常规剂量与低剂量CT图像,示未见伪影图3示小于5mm肯定肺结节(→)和模糊肺结节(←),图4分别显示为肯定(→)、未见(←)


图5 常规剂量CT显示左肺小于5mm模糊小结节(→),
图6 同一层面的低剂量CT示为肯定肺结节(→)
【参考文献】
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