Classification of Pulmonary Nodules by Using Hybrid Features

Table 1

Geometric features used for pulmonary nodule detection.

Measure	Definition
Area	𝐴
Perimeter	𝑃
Diameter	𝐷
Solidity	𝑆
Eccentricity	𝐸
Aspect ratio	Min.diameter(𝑀)Max.diameter(𝐿)
Compactness	𝑃^24𝜋𝐴
Roundness	4𝐴𝜋𝐿^2
Circularity	4𝜋𝐴𝑃^2
Ellipticity	𝜋𝐿^22𝐴