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SyneRBI / PETRIC

PET Image Reconstruction Challenge 2024
https://www.ccpsynerbi.ac.uk/events/petric/
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Neighborhood definition #29

Closed gschramm closed 5 days ago

gschramm commented 2 weeks ago

The wiki says:

$N_i$ the neighbourhood of voxel $i$ (here taken as the 8 nearest neighbours in the 3 directions),

What does that mean? I am a bit confused by the definition. Do we have 8x3 = 24 out of 3x3x3=27 nearest neighbors?

A small drawing / sketch could help to clarify that.

Georg

KrisThielemans commented 1 week ago

Participants are actually required to use the SIRF RDP implementation, for the same reason as using the SIRF Parallelproj:

Apologies that this isn't clear. We'll do some rephrasing.

Regarding the actual question, I checked the STIR implementation https://github.com/UCL/STIR/blob/32befa6b19a3445c5b1522b3ef297a6def6786e7/src/recon_buildblock/RelativeDifferencePrior.cxx#L252-L266. It uses 3x3x3 actually (I thought the corners weren't included).

KrisThielemans commented 5 days ago

Wiki now states that participants have to use the CudaRelativeDifferencePrior