Grand Challenge

Hi, I have 2 questions regarding nifti file provided:

Some patients with very small number of positive labels (only 8, 12 pixels) I found some patients have very small number of positive values in the labeling (suspiciously too small value). For examples, here are example 2 studies (added filel location and study uid) that I found with very small number of positive labels: * Patient 1 - this patient has only 8 pixels within entire 3D image labeled as positive * Fileloc: './FDG-PET-CT-Lesions/PETCT_0223010e46/09-04-2003-NA-PET-CT Ganzkoerper primaer mit KM-25360/SEG.nii.gz' * Study UID: '1.3.6.1.4.1.14519.5.2.1.4219.6651.244527146284048974110045425360' * Patient 2 - this patiuent has only 12 pixels within entire 3D image labeled as positive * Fileloc: './FDG-PET-CT-Lesions/PETCT_5d994c3f44/03-05-2006-NA-PET-CT Ganzkoerper primaer mit KM-80237/' * Study UID: '1.3.6.1.4.1.14519.5.2.1.4219.6651.286593261135762764087617380237'
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        There are some other studies with very small number of positive labels as well.
        Are these all correctly labeled ones (only 8 pixels, 12 pixels), or do I have some wrong files?
        I just want to confirm this before I begin to work.
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Do nifti files have same affine matrix as dicom images? I want to know if nifti files are made after some transformation applied images from dicom image. If dicom images have higher resolution, I think it would probably better download dicom and work with dicom images.

Thanks!

Question about the label values