TCIA full and low dose CT images and volumetric normal pancreas segmentations

This publicly available CT dataset was downloaded from 50 portal venous phase abdominal CT scans (3mm-slice thickness) performed in 50 patients with liver metastases— from The Cancer Imaging Archive (TCIA).These CT scans were acquired with routine radiation dose levels per standard clinical protocols on SOMATOM Definition Flash CT scanner (Siemens Healthcare, Forchheim, Germany).Each study had been postprocessed to include a second reconstructed CT dataset at a simulated 25% radiation dose level. The mean (standard deviation [SD]) radiation dose for the full dose and the reduced dose CT datasets were 14.7 mSv (8 mSv) and 3.7 mSv (2 mSv), respectively. After a curation process by radiologists, 9 of 50 cases were excluded [chronic calcific pancreatitis (n = 1), postsurgical changes in pancreas (n = 2) and pancreatic lesions (n = 6)]. Volumetric pancreas segmentations were done on all the remaining 41 cases [16 males and 25 females, mean (SD) patient age: 60.8 years (14.7 yrs)] independently by the two radiologists (R1 and R2). Segmentations were first done on the full dose CT dataset and then repeated on the reduced dose CT dataset by both R1 and R2 after a gap of at least 24 hours to allow for memory extinction.