Table 1.

Databases used for training and evaluating our CADe scheme.

Database	No. of nodule cases	No. of normal cases	Descriptions
A	300	100	Training cases collected for developing our CADe scheme
BS	140	93	Subset of JSRT [14 cases with nodules in the opaque portions were excluded (Refs. 24, 27)]a
B	154	93	All nodule cases (154) and all normal cases (93) in JSRT database
C	48	0	U of C database

^aThe 14 cases were excluded because the purpose of our CADe scheme and other CADe schemes (Refs. ²⁴, ²⁷) was to detect nodules in the lung fields; therefore, the outside of the lung fields is outside our scope.