Conversion from SimpleITK image to torchio Image

[mattwarkentin]

Hi,

I know you can convert from a torchio Image to a SimpleITK image using the image.as_sitk() method. But is there an efficient way to go from a SimpleITK image back to torchio? Something like from_sitk()?

[mattwarkentin]

It seems to me that since torchio supports reading in any image from disk that is supported by SimpleITK or nibabel, that it should also support creating a torchio Image using in-memory SimpleITK or nibabel images. What do you think?

[fepegar]

Hi, @mattwarkentin. I think that's a good idea. We could add a method to Image, for example:

@classmethod
def from_sitk(cls, sitk_image):
    tensor, affine = sitk_to_nib(sitk_image)
    return cls(tensor=tensor, affine=affine)

Where sitk_to_nib would need to be imported.

Then, you could do, for example:

tio.ScalarImage.from_sitk(sitk_image)

Would you like to contribute with a PR?

[mattwarkentin]

I agree with the approach. Sure, I would be happy to contribute a PR to this project.

[fepegar]

Great, thanks!

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