When the distance between positive and inverse Fourier transform system changes, the CCD is adjusted to the focal plane by variable value of interval between two peaks on CCD with computer.
通过镜组移动改变正、负傅里叶变换系统的距离，用软件比较CCD上两个波峰的间隔是否变化来对CCD进行定焦。
Focal area of ground glass attenuation on LUL, which shows no remarkable interval size or configuration changes on 2 months follow-up CT scan.
左上叶局部毛玻璃影，在2个月的CT随访中无明显的大小及形态改变。
Focal area of ground glass attenuation on LUL, which shows no remarkable interval size or configuration changes on 2 months follow-up CT scan.
左上叶局部毛玻璃影，在2个月的CT随访中无明显的大小及形态改变。
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