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Add spacing to surface distances calculations #6137

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#6144
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Add spacing to surface distances calculations#6137
#6144
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@gasperpodobnik
gasperpodobnik
opened on Mar 13, 2023

Is your feature request related to a problem? Please describe.
The current implementation of Hausdorff distance and other surface distance metrics only works for images with isotropic spacing.

Describe the solution you'd like
Consider adding a new parameter spacing to the metric call in order to pass it as sampling=spacing to both distance_transform_edt and distance_transform_cdt functions inside the get_surface_distance function (

MONAI/monai/metrics/utils.py

Line 175 in a8302ec

def get_surface_distance(seg_pred: np.ndarray, seg_gt: np.ndarray, distance_metric: str = "euclidean") -> np.ndarray:
). This will allow users to specify the voxel spacing during distance transform computation, which can be useful for handling different image resolutions.
The same is done in DeepMind's implementation (https://github.com/deepmind/surface-distance/blob/master/surface_distance/metrics.py#L254).

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  1. wyli
    added
    Contribution wanted
    Feature request
    on Mar 13, 2023
  2. wyli
    closed this as completedin #6144on Apr 12, 2023
  3. wyli
    added a commit that references this issue on Apr 12, 2023

    added spacing to surface distances calculations (#6144)

    ef1285a
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