这被称作充气过度，可以通过残气容积(RV)的增加来衡量。

This is called hyperinflation and can be measured as an increased residual volume (RV).

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残气容积（RV）与吸气相中肺野平均肺密度极显著相关（P<0.01），与上、下肺野及全肺则为显著相关（P<0.05）。

RV correlates extremely significantly with the middle lung field on inspiratory HRCT(P<0.01) , significantly with the upper, lower lung field and overall lung(P<0.05).

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