Preparing NKI-RS's asl data for aslprep

, ,
1

hi, i’m wondering if anyone here has run aslprep on the NKI-RS data?

The NKI-RS asl data (downloaded from the AWS links) isn’t formatted very nicely ‘out of the box’, there are many missing parameters in the *_asl.json file required by aslprep which i’m trying to figure out.

The aslprep nature methods paper made use of the NKI-RS data in their validation work. It comes with a supplementary table with some important parameters that i can use in the *_asl.json

However i notice there are some inconsistencies in what is described in the nature methods paper supplementary table 3, and the MRI protocol (pages 16&17) provided by the NKI-RS investigators

  1. According to the MRI protocol, PostLabelingDelay = 1000000us (or 1 sec), however according to the supplementary table 3, it is 1.517s
  2. According to the supplementary table 3 TotalAcquiredPairs= 50, however, according to the MRI protocol, the measurements=80, which I presume will translate to TotalAcquiredPairs= 40. I’ve checked there are indeed 80 volumes in the *_asl.nii.gz

So, which PostLabelingDelay and TotalAcquiredPairs values should i use?