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Figure 2
Artificially coloured image showing the movement of lead particles on the airway surface. Three consecutive frames were taken and the intensity colour map modified for each such that black (i.e. lowest intensity) was replaced by red (frame 1), blue (frame 2) and green (frame 3), rendering the highly attenuating lead particles in each of these colours. The three frames were then added, so that moving particles could be seen in colour, with stationary particles seen in black (the sum of red, green and blue). In the inset the dorsal edge of the trachea is magnified 2× and particles can be seen moving at different rates and in different directions (as marked) along the airway surface. The small colour changes surrounding the large particles represent minor fluctuations from airway movement. As in Fig. 1[link] the head is to the right and the lungs are to the left. The main image is 1.8 mm × 1.2 mm (inset is ∼0.72 mm × 0.24 mm).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 19| Part 4| May 2012| Pages 551-558
doi:10.1107/S0909049512018250
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