A Dataset of Abdominal CT with Artery and Vein Segmentations for Colorectal Cancer Surgical Planning.

Safe colorectal cancer (CRC) resection depends on accurate preoperative understanding of mesenteric vascular anatomy, which is highly variable and poorly represented in existing datasets. We curated dual-phase contrast-enhanced abdominal CT (CECT) scans from 60 adults imaged over one year on a Siemens SOMATOM Force scanner (slice thickness 0.75 mm). Arterial phases (25-30 s) and venous phases (55-60 s) were manually segmented in 3D Slicer by an experienced surgeon and verified by a senior colorectal surgeon; without inter-phase registration to preserve native characteristics. The resource includes 60 CECT studies (50 dual-phase, 10 venous only), each containing  ~700-900 axial slices. Deliverables comprise CECT volumes, per-structure 3D label masks for major mesenteric arteries and veins. Example figures of overlays and 3D masks are provided. Intended uses include vessel segmentation, vascular-aware surgical planning, and registration research. Limitations include single-institution acquisition, difficulty delineating small vessels <4 mm, absence of inter-phase registration, and altered vascular anatomy from surgeries.