Can the extent of low-attenuation areas on CT scans really demonstrate changes in the severity of emphysema?
B. Stoel, D. Parr, E. Bakker, H. Putter, J. Stolk, H. Gietema, A. Schilham, B. van Ginneken, R. van Klaveren, J. Lammers and M. Prokop
Radiology 2008;247(1):293-4; author reply 294.