fidoptCHAOS CT liver
Portal venous CT of the upper abdomen of a potential liver donor, the liver drawn by hand on every slice (CHAOS, Dokuz Eylul University Hospital).
10 test casesabdomenimage CTresearch only
Read before comparing (8)
- Cohort. Potential living liver donors at Dokuz Eylul University Hospital, Izmir, whose livers the provider calls healthy: no tumour, lesion or other disease. The CT and MR patients of CHAOS are different people (the data page), so this set and CHAOS_MR share no one.
- Images. Portal venous CT of the upper abdomen, 70 to 80 s after contrast, on a Philips SecuraCT, a Philips Mx8000 or a Toshiba AquilionOne: 512 x 512 pixels of 0.57 to 0.79 mm, slices 2 to 3.2 mm thick reconstructed 1 to 2 mm apart, as 32-bit integers in Hounsfield units. Many pad outside the reconstructed circle with -1000. On case10, case14 and case19 the first two pixels of every slice read 15,641 to 49,944, outside the body; they are left as delivered. No mask is given.
- Truth. Three radiologists drew every slice and the majority vote is the label, the vena cava taken out where it is distinct: a consensus of experts, graded expert. The organ is healthy, so the boundary and the vena cava decide the score.
- Room. The ten test livers (1,043 to 2,198 mL) moved one voxel keep a Dice of 0.97 to 0.99: little room on the Dice, more on the surface Dice at 1 mm, under the slice spacing. The challenge's best CT entries reached a Dice of 0.98 on its hidden test set.
- Start. Labelling the whole body (above -500 HU) as liver scores a mean Dice of 0.27 on the test cases (surface Dice 0.02); Otsu's bright voxels 0.28.
- TotalSegmentator. Version 2.18 (task total) scores a Dice of 0.966 on case06 and 0.974 on case21 for the liver, with a surface Dice of 0.66 and 0.85 at 1 mm: close to the truth, not equal to it.
- Overlap. No other dataset of the corpus names CHAOS's CT part, and no built image has the grid of any of the 20 (12,304 stores compared by size and spacing, a check that finds AbdomenDIRQA's case20 in MSD_Pancreas).
- Outside numbers. None: the challenge scored on its 20 hidden test patients.
No method has a result on every case of this dataset yet.
Case by case
Click a score to look at that result: the image, the truth in green and the method's map in red. Underlined scores have their image; for the others you see the case without the result.
About the data
- Test cases
- 10 test patients drawn with seed 2026 among the 10 outside development, and 10 development patients, the last of the same seeded order: the challenge's 20 labelled CT patients. The labels of its 20 test patients are withheld, and those patients are not used.
- Truth
- contours by experts the liver drawn by hand on every slice by three radiology experts (10, 12 and 28 years of experience), the label decided by majority vote; the inferior vena cava left out where it can be told apart (the dataset's ground images, reviewed in 2019)
- Licence
- CC BY-NC-SA 4.0
10 cases for tuning, never tested
case10, case22, case27, case05, case29, case01, case18, case23, case02, case08