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. Author manuscript; available in PMC: 2013 Aug 13.
Published in final edited form as: Phys Med Biol. 2012 Jan 13;57(3):685–701. doi: 10.1088/0031-9155/57/3/685

Figure 7.

Figure 7

Dependence of estimation performance on tumour position: The VOI estimator (k=10) achieved very low bias, essentially independent of the position of the tumour within the phantom. The SUV metric was strongly affected by the position-dependent rate of convergence of the OSEM reconstruction. The bias and precision of the pGTM estimates, which were only obtained for spheres along the central axis of the phantom, are also shown here for comparison. SUVavg is not shown, since the large bias (see Figure 4) would make visibility of the smaller bias values for the VOI and pGTM estimates difficult.