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. Author manuscript; available in PMC: 2008 Feb 5.
Published in final edited form as: Magn Reson Med. 2002 Mar;47(3):433–438. doi: 10.1002/mrm.10091

FIG. 3.

FIG. 3

Images from lungs of a pig before (top row) and after (bottom row) creation of a ventilation defect. Images a and e are one slice from a 3D perfusion dataset. Images b and f are maximum intensity images (SImax) calculated from the dynamic perfusion datasets. Images c and g are time delay maps, as defined in the text, with hyperintensity representing longer delays. Image d schematically illustrates the definitions of the parameters in the calculated parametric maps. Image h was acquired postventilation-defect using 3He. The arrow in e, g, and h points to the region of defective ventilation.