Journal Article in-line X-ray phase-contrast computed tomography Research Support, Non-U.S. Gov't X-ray phase-contrast computed tomography adaptive-weighted anisotropic total p-variation regularization cirrhosis few-view projections fibrous tissues forward and backward diffusion filtering hepatocellular carcinoma (HCC) iodine staining microvasculature phase-contrast computed tomography (PCCT) projection onto convex sets radiation dose simultaneous algebraic reconstruction technique three-dimensional imaging thrombus