Adrenal SI in-phase:
Adrenal SI opposed-phase:
Spleen SI in-phase:
Spleen SI opposed-phase:
Adrenal signal intensity index (%):
Adrenal-to-spleen CSI ratio:
Caveat: CSI measurement is less effective than CT washout measurement for lesions ≥20 HU at unenhanced CT and of very limited use in lesions ≥30 HU at unenhanced CT.
Caveat: The signal-intensity index threshold of 16.5% is validated for 1.5 T. The threshold at 3 T may be lower.