Iodine images showing the effects of the proposed image-gradient-correlation (IGC) based regularizer in both Incept-net and U-net, and the effects of additional factorized convolution with 7×7 filters in Incept-net. The arrows indicate the aliasing at the bottom boundary of the animal. The zoom-in insets are 2.5 times the size of the square region-of-interests. The ranges of display window for full field-of-view iodine images, the zoom-in iodine images, CT images were [0, 10] mg/cc, [0 4] mg/cc, and [-160, 240] HU.