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Figure 2. An example of the time–attenuation curve in portal perfusion measurement. Time–attenuation curve of relative enhancement ({Delta}HU) of the liver, spleen (a), and subtracted liver (a pure portal venous curve separate from its arterial component) (b). Gs, the peak splenic gradient; Gl, the peak gradient of original hepatic time–attenuation curve; Gp, the peak gradient of subtracted hepatic time–attenuation curve in the portal venous phase.





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