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. Author manuscript; available in PMC: 2010 Oct 12.
Published in final edited form as: Proc SPIE Int Soc Opt Eng. 2007 Jan 1;6510:651002. doi: 10.1117/12.716908

Figure 2.

Figure 2

Illustration of photon counting with a lens-coupled CCD detector. Left: A single frame of data showing clusters of pixels excited by individual 140 keV photons, superimposed on considerable readout noise. Right: Image obtained by event detection and centroiding for position estimation.