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# Table 3 CRC_{mean} and CRC_{max} limits for the six phantom spheres as defined by EARL [17]. For each sphere, relative differences between the upper and lower CRC limits were calculated using \( {\mathrm{CRC}}_{\mathrm{dif}}\left(\%\right)=\frac{\mathrm{maximumCRC}-\mathrm{minimumCRC}}{\left(\mathrm{maximumCRC}+\mathrm{minimumCRC}\right)\times 0.5}\times 100 \)

From: SUV variability in EARL-accredited conventional and digital PET

Sphere diameter | Limits | |||
---|---|---|---|---|

CRC_{mean} | CRC_{max} | |||

min–max limits | CRC_{dif} (%) | min–max limits | CRC_{dif} (%) | |

10 mm | 0.27–0.43 | 46% | 0.34–0.57 | 51% |

13 mm | 0.44–0.60 | 31% | 0.59–0.85 | 36% |

17 mm | 0.57–0.73 | 25% | 0.73–1.01 | 32% |

22 mm | 0.63–0.78 | 21% | 0.83–1.09 | 27% |

28 mm | 0.72–0.85 | 17% | 0.91–1.13 | 22% |

37 mm | 0.76–0.89 | 16% | 0.95–1.16 | 20% |