Hi @Mingrun,
Thank you for the detailed description and for figuring out the bug.
Could you tell me which software version the data was acquired on? The readout of PRESS data from Siemens should work quite reliably for stock PRESS or at least it was tested for numerous datasets.
Also, while using Gannet as a comparison to see whether the data is a good approach it may also use the wrong number of points. The only way to conclusively know the number of points is to look at the sequence settings on the scanner or the exam card.
Again, I would greatly appreciate it if you could share the data so that we could figure this out together.
Best,
Helge