  Renal structure segmentation from computed tomography angiography~(CTA) is
essential for many computer-assisted renal cancer treatment applications.
Kidney PArsing~(KiPA 2022) Challenge aims to build a fine-grained
multi-structure dataset and improve the segmentation of multiple renal
structures. Recently, U-Net has dominated the medical image segmentation. In
the KiPA challenge, we evaluated several U-Net variants and selected the best
models for the final submission.
