BHSD — Brain CT Intracranial Hemorrhage

The Brain Hemorrhage Segmentation Dataset (BHSD) ships 192 pixel-labeled intracranial hemorrhage CT volumes and 1980 unlabeled volumes. The public release is NIfTI-only, and many files carry NIfTI geometry that makes sagittal/coronal views look distorted even though the axial slices themselves look correct.

For this MedSeg import we reconstructed the dataset using the best interpretation of the source geometry: axial pixel planes are preserved, while two inter-slice errors are repaired. First, slice-to-slice anterior/posterior drift is removed by translating each axial slice in-plane. Second, implausible through-plane spacing is replaced with a plausible z spacing inferred from the source affine, slice count, and visual QA. The AP translation is scaled together with the z-spacing repair, which handles files whose NIfTI slice vector appears to have been half-scaled or tenfold-scaled during creation. No full gantry-angle or cover-grid resampling is applied: the original axial slice appearance and voxel matrix are kept. All labeled and unlabeled source files are included; 4D source files are split into separate 3D volumes.