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. Author manuscript; available in PMC: 2014 Nov 7.
Published in final edited form as: Phys Med Biol. 2013 Oct 10;58(21):10.1088/0031-9155/58/21/7563. doi: 10.1088/0031-9155/58/21/7563

Figure 4.

Figure 4

RMSE in reconstructions of the lung nodule image [Figure 2(b)] from sparse projections over a range of prior image penalty strengths (βP) and roughness penalty strengths (βR) for three levels of incident fluence: (a) 102, (b) 103, and (c) 104 photons / pixel. In this case, δ is fixed at 10−4 mm−1. The optimum (minimum RMSE) is marked with an asterisk.