TABLE 2.

Tolerance levels used in the Periodic Image Quality Test (PIQT) tests that monitor signal‐to‐noise ratio (SNR) and uniformity

Imaging sequence	SNR tolerance	Uniformity tolerance (%)
MS‐MESE	Echo 1: SNR > 59	Echo 1: uniformity < 47
	Echo 2: SNR > 44	Echo 2: uniformity < 48
MS‐FFE	SNR > 48	Uniformity < 47
2D‐MESE	Echo 1: SNR > 45	Echo 1: uniformity < 10
	Echo 2: SNR > 39	Echo 2: uniformity < 10
	Echo 3: SNR > 30	Echo 3: uniformity < 10

Abbreviations: 2D‐MESE, two‐dimensional multi‐echo spin‐echo; MS‐FFE, multi‐slice fast field‐echo; MS‐MESE, multi‐slice multi‐echo spin‐echo.