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EJNMMI Physics
Fig. 5 | EJNMMI Physics

Fig. 5

From: Cross-calibration of the Siemens mMR: easily acquired accurate PET phantom measurements, long-term stability and reproducibility

Fig. 5

Cross-calibration ratios for six PET systems. The 59 cross-calibrations included in this study are plotted outside the red box and show high long-term stability and reproducibility of all scanners: Only five Xcal ratios were outside the ±5 % acceptance range indicated by the red horizontal lines and only by 1 % each of the five times (and never twice in a row). In the red box, five cross-calibrations using the user-defined μ-map for the mMR PET/MR system are plotted, showing the accuracy of the mMR in the period February–May 2015 (following directly after our 3-year study and initial testing of the predefined μ-maps). PET1 (HRRT) and the mMR were each left out 5 of the 59 times (details for the mMR given in the text, the HRRT because of 1–2-week setups were ongoing or other unavailability)

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