JSRT Database
This is a publicly available database with 247 PA chest radiographs collected from 13 institutions in Japan and one in the United States.
The images were scanned from films to a size of 2048 by 2048 pixels, a spatial resolution of .175 mm/pixel, and 12-bit gray levels. 154 images contain exactly one pulmonary lung nodule each; the other 93 images contain no lung nodules.
The JSRT database was established by the Japanese Society of Radiological Technology (JSRT).