Question Posted 02/26/14:
Hi,
We're downloading sequences for processing at the DRC and have encountered some scans with previously unknown series descriptions:
ADNI_073_S_2182 ADNI2 V11 "MPRAGE GRAPPA2_S4_DIS3D"
ADNI_073_S_2182 ADNI2 V11 "MPRAGE_S2_DIS3D"
- Some other recent site 73 scans use "MPRAGE_S2_DIS3D" too, in the case of ADNI_073_S_2182 ADNI2 V11 there are also the same descriptions we have previously encountered (a total of 4 pre-processed images listed for download), which images should we be processing? From acquisition parameters the source images for the two GRAPPA2 appear to be the same, similarly for the non-accelerated scans, but originalRelatedImage imageUIDs are different, e.g. 400370 and 400372.

We also have a scan that may be a scanner change, again with a series that has an unusual series description (the _ND suffix):
ADNI_013_S_4268_MT1__GradWarp__N3m_S206389_I399886.xml "MPRAGE GRAPPA 2_ND"
We think we need to exclude a scanner change from our longitudinal analysis since it relies on image consistency. Is there a particular meaning to the "_ND" series descriptor?

Thanks for your time,
Ian