Skip to main content
. Author manuscript; available in PMC: 2013 Mar 15.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2011 Dec 22;82(4):e631–e638. doi: 10.1016/j.ijrobp.2011.07.044

Fig. 3.

Fig. 3

Lung functional map is shown on SPECT-CT during RT. Scans show changes in functional mapping on SPECT according to underlying causes and their potential impact for radiation planning. Type B3 defects partially recovered, while B1 and B2 defects did not change significantly during RT. The defect classification has been previously described (16). Briefly the A region consists of functional defects corresponding to the location of tumor. The B1 region represents complete function defect induced by COPD or other unrecoverable diseases. The B2 region is reduced lung function induced by unrecoverable diseases. B3 region consists of temporarily dysfunctional lung induced by tumor and other potentially recoverable diseases. The C region is normally functioning lung.