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. Author manuscript; available in PMC: 2013 Nov 1.
Published in final edited form as: Magn Reson Imaging. 2012 Jul 15;30(9):1291–1300. doi: 10.1016/j.mri.2012.06.002

Figure 1.

Figure 1

Figure 1

Figure 1

Sample PET image and recovery coefficient measurements of the same phantom filled with long half-life 68Ge epoxy. (A) A sample PET image of the modified NEMA NU-2 Image Quality (IQ) phantom with hot sphere diameters range from 10 to 37 mm. (B) Average recovery coefficients (RC) of maximum ROIs (measured / true) based on 20 repeat scans by 3 scanners at 3 sites with each scanner made by a different manufacturer (adapted from Doot et al. [22]). (C) Recovery coefficients of maximum ROIs from single scans from 11 different PET scanners with the average value represented by a thick black line (adapted from Doot et al. [38]. Error bars represent the standard deviation of maximum ROI measurements from 20 scans by a single scanner in (B) and one scan by eleven scanners in (C).