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. 2022 Jan 4;40(6):547–559. doi: 10.1007/s11604-021-01233-2

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Fig. 12 — Axial monochromatic 70 keV images showing an adrenal adenoma (a) and an adrenal metastasis (b). Based on its CT number (HU = 19), the adenoma is not lipid-rich. At lower energy levels, the CT attenuation of the tumor decreases (a), suggesting that it contains fat. On the other hand, attenuation of the adrenal metastasis is increased at lower energy levels (b)