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/ants/utils/sitk_to_ants.py
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| a | b/ants/utils/sitk_to_ants.py | ||
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| 1 | import numpy as np |
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| 2 | import ants |
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| 3 | |||
| 4 | |||
| 5 | def from_sitk(sitk_image: "SimpleITK.Image") -> ants.ANTsImage: |
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| 6 | """ |
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| 7 | Converts a given SimpleITK image into an ANTsPy image |
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| 8 | |||
| 9 | Parameters |
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| 10 | ---------- |
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| 11 | img: SimpleITK.Image |
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| 12 | |||
| 13 | Returns |
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| 14 | ------- |
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| 15 | ants_image: ANTsImage |
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| 16 | """ |
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| 17 | import SimpleITK as sitk |
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| 18 | |||
| 19 | ndim = sitk_image.GetDimension() |
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| 20 | |||
| 21 | if ndim < 3: |
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| 22 | print("Dimensionality is less than 3.") |
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| 23 | return None |
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| 24 | |||
| 25 | direction = np.asarray(sitk_image.GetDirection()).reshape((3, 3)) |
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| 26 | spacing = list(sitk_image.GetSpacing()) |
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| 27 | origin = list(sitk_image.GetOrigin()) |
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| 28 | |||
| 29 | data = sitk.GetArrayViewFromImage(sitk_image) |
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| 30 | |||
| 31 | ants_img: ants.ANTsImage = ants.from_numpy( |
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| 32 | data=data.ravel(order="F").reshape(data.shape[::-1]), |
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| 33 | origin=origin, |
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| 34 | spacing=spacing, |
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| 35 | direction=direction, |
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| 36 | ) |
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| 37 | |||
| 38 | return ants_img |
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| 39 | |||
| 40 | |||
| 41 | def to_sitk(ants_image: ants.ANTsImage) -> "SimpleITK.Image": |
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| 42 | """ |
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| 43 | Converts a given ANTsPy image into an SimpleITK image |
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| 44 | |||
| 45 | Parameters |
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| 46 | ---------- |
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| 47 | ants_image: ANTsImage |
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| 48 | |||
| 49 | Returns |
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| 50 | ------- |
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| 51 | img: SimpleITK.Image |
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| 52 | """ |
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| 53 | |||
| 54 | import SimpleITK as sitk |
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| 55 | |||
| 56 | data = ants_image.view() |
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| 57 | shape = ants_image.shape |
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| 58 | |||
| 59 | sitk_img = sitk.GetImageFromArray(data.ravel(order="F").reshape(shape[::-1])) |
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| 60 | sitk_img.SetOrigin(ants_image.origin) |
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| 61 | sitk_img.SetSpacing(ants_image.spacing) |
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| 62 | sitk_img.SetDirection(ants_image.direction.flatten()) |
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| 63 | return sitk_img |