Hi BIDSonauts (or BIDSounours your choice)!
and maybe @agahkarakuzu more specifically 
The question is: how should STAGE data should be named in BIDS ?
Data I got have 5 echoes at 2 flip-angles in complex data (mag+phase).
On Siemens, pulse sequence name is “*fl3d5”.
dcm2niix BIDSGuess gives MEGRE suffix, but MEGRE spec do not have the flip entity (though could use chunk-).
Should it be suffixed as MPM with mt-off for all images?
Or none of the above? None of the qMRI current spec?
Thanks for your help!
Cheers!
VFA (variable flip angle) would allow echo, flip and part, with no other required data:
sub-<label>[_ses-<label>][_task-<label>][_acq-<label>][_ce-<label>][_rec-<label>][_run-<index>][_echo-<index>]_flip-<index>[_part-<mag|phase|real|imag>][_chunk-<index>]_VFA.json
sub-<label>[_ses-<label>][_task-<label>][_acq-<label>][_ce-<label>][_rec-<label>][_run-<index>][_echo-<index>]_flip-<index>[_part-<mag|phase|real|imag>][_chunk-<index>]_VFA.nii[.gz]
https://bids-specification.readthedocs.io/en/stable/appendices/qmri.html#inputs-are-file-collections
Maybe, though VFA in the BIDS-specs is SPGR but the dicoms show
(0018,9016) CS [NONE] # 4, 1 Spoiling
However, this tag (which is the SequenceVariant) could indicate SP(oiling).
(0021,105b) CS [SP\OSP] # 6, 2 Unknown Tag & Data
the spec also require SSFP which could maybe be named FISP on Siemens and then in that case PulseSequenceName should contain fi per Siemens doc?
BTW: these are enhanced dicoms from XA30, which is a whole new world.
I will continue to investigate.