{
  "table_description": "This table contains one row per DICOM series from IDC for single-frame CT, MR, and PT SOP classes, with boolean columns characterizing the geometric properties of each series. The checks determine whether the series forms a regularly-spaced rectilinear 3D volume (consistent orientation, spacing, dimensions, and slice positions). Series that do not pass all checks may still be usable with additional processing such as resampling or acquisition geometry correction (e.g., for variable-spacing or gantry-tilted acquisitions). Oblique-aware: uses projection-based slice position computation, which handles gantry-tilted CT, oblique MR, and axial PET uniformly.",
  "columns": [
    {
      "name": "SeriesInstanceUID",
      "type": "STRING",
      "mode": "NULLABLE",
      "description": "unique identifier of the DICOM series"
    },
    {
      "name": "single_orientation",
      "type": "BOOLEAN",
      "mode": "NULLABLE",
      "description": "TRUE if all instances share the same ImageOrientationPatient (DICOM attribute)"
    },
    {
      "name": "orthogonal_orientation",
      "type": "BOOLEAN",
      "mode": "NULLABLE",
      "description": "TRUE if the cross product of row and column orientation vectors has unit magnitude (within orientationTolerance), confirming orthogonal direction cosines"
    },
    {
      "name": "unique_slice_positions",
      "type": "BOOLEAN",
      "mode": "NULLABLE",
      "description": "TRUE if every instance has a distinct slice position along the volume normal, i.e. no duplicate or overlapping slices"
    },
    {
      "name": "consistent_in_plane_row",
      "type": "BOOLEAN",
      "mode": "NULLABLE",
      "description": "TRUE if the projection of ImagePositionPatient onto the row direction is constant across all instances (within inPlaneTolerance)"
    },
    {
      "name": "consistent_in_plane_col",
      "type": "BOOLEAN",
      "mode": "NULLABLE",
      "description": "TRUE if the projection of ImagePositionPatient onto the column direction is constant across all instances (within inPlaneTolerance)"
    },
    {
      "name": "consistent_pixel_spacing",
      "type": "BOOLEAN",
      "mode": "NULLABLE",
      "description": "TRUE if all instances share the same PixelSpacing (DICOM attribute)"
    },
    {
      "name": "consistent_image_dimensions",
      "type": "BOOLEAN",
      "mode": "NULLABLE",
      "description": "TRUE if all instances share the same Rows and Columns values (DICOM attributes)"
    },
    {
      "name": "uniform_slice_spacing",
      "type": "BOOLEAN",
      "mode": "NULLABLE",
      "description": "TRUE if the spacing between consecutive slices is constant (within relativeSliceTolerance, a relative fraction of expected spacing)"
    },
    {
      "name": "obliquity_degrees",
      "type": "FLOAT",
      "mode": "NULLABLE",
      "description": "angle in degrees between the slice normal and the nearest cardinal axis (X, Y, or Z in patient coordinates); 0 means pure axial, sagittal, or coronal; values above 0 indicate oblique acquisition or gantry tilt"
    },
    {
      "name": "regularly_spaced_3d_volume",
      "type": "BOOLEAN",
      "mode": "NULLABLE",
      "description": "TRUE if all individual checks pass, indicating the series forms a regularly-spaced rectilinear 3D volume that can be loaded directly into a 3D array without resampling"
    }
  ]
}