Figure 3a.

Hepatic parenchymal alterations at unenhanced MR imaging in a man with HCV-related cirrhosis. Unenhanced T1-weighted 2D gradient-echo image (repetition time msec/echo time msec = 180/2.3, flip angle = 70°) (a) and T2-weighted respiratory triggered fat-saturated fast spin-echo image (5000/80) (b), obtained at 3 T, show fibrotic septa and bridges as reticulations throughout the liver parenchyma. The reticulations (arrows) are hypointense on the T1-weighted image and hyperintense on the T2-weighted image. Note the innumerable regenerative nodules (arrowheads), which are iso- to hyperintense on the T1-weighted image and iso- to hypointense on the T2-weighted image.