Location Frequency Percent LLL 43 25.9 LUL 29 17.5 RLL 42 25.3 RML 27 16.3 RUL 25     Total= 166   LLL= left lower lobe, LUL= left upper lobe, RLL= Right lower lobe, RML= Right Middle Lobe, RUL= Right upper lobe

Table 2: Location distribution of nodules missed by NBH CT.