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. Author manuscript; available in PMC: 2014 Jun 8.
Published in final edited form as: J Appl Geophy. 2012 Jan;76:74–81. doi: 10.1016/j.jappgeo.2011.10.003

Figure 4.

Figure 4

Time-ordered (left to right) longitudinal sections through the sand-filled 16 × 5 cm portion of the column in (a) imaging experiment A, (b) numerical study A, (c) imaging experiment B, (d) numerical study B. Approximately the lower 80% of the column shown in both (c) and (d). PET images are decay-corrected so the image intensity is proportional to the tracer concentration. The time variables for the frames individual frames were selected to visually match the propagation of the tracer edge in PET and simulation image sequences. Since quantitative information on tracer concentration is not available at this time, proportional color scheme was selected with brightness and contrast adjusted for best visibility of the tracer bolus.