...不同的灰价可以依CT值的不同范围来重新定义衰减值，假设CT范围的中心值不变，定义的范围一变窄后，我们称为窄窗位(Narrow Window)，比较细部的小变化就可以分办出来了，在影像处理的观念上，我们称为对比压缩。
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A Narrow Window 一扇小窗
Through a Narrow Window 通过一扇狭小的窗户
narrow pressure window 窄压力窗口
a narrow slit window 弦月窗
Neal wedged his way through a narrow window.
尼尔从一个窄窗户挤了进去。
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On what is a very narrow window of opportunity.
什么是一个很狭窄的机会之窗。
He balanced precariously on the narrow window-ledge.
他在狭窄的窗台上很难保持平衡。
TEMPLE-RASTON: De Mistura said that the al-Maliki government had been given a narrow window of opportunity.
NPR: U.N. Chief in Iraq Sees Limited Progress
Unfortunately, the Democrats were able to exploit their narrow window of opportunity to pass Obamacare.
FORBES: So That Freedom May Live, Obamacare Must Die
If they failed to sign up in that narrow window, they would have no coverage until the next enrollment period.
FORBES: The Alternatives To ObamaCare's Individual Mandate
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