However, I think the BackgroundSuppressionPulseTime is only a recommended parameter, not a required one (at least that is what the bids validator v 1.14.6 says, and it is not possible on our Philips system to find out from dicom what the backgroundsuppressionpulsetime is).
This should be changed to say 'recommended' not 'required'
In the ASL section, under pcasl, https://bids-specification.readthedocs.io/en/stable/appendices/arterial-spin-labeling.html the specification reads "Additionally, the BackgroundSuppressionPulseTime's is required in case BackgroundSuppression was applied."
However, I think the BackgroundSuppressionPulseTime is only a recommended parameter, not a required one (at least that is what the bids validator v 1.14.6 says, and it is not possible on our Philips system to find out from dicom what the backgroundsuppressionpulsetime is).
This should be changed to say 'recommended' not 'required'
Thanks
Michael