I swapped the VFS channels. this did not change the mtune issues on
channel 2. Im worried about the "Tune Selector #1" box. as I had
to put that back into the RFFE. Im not sure if it was the original one,
or one I replaced on our 800 MHz VNMRS RFFE. But that seems to properly
route the channel 1 (1H signal).
The lock is another puzzling issue. I have loaded the previous
shim set, (i'm using the same shim coil and power supply from the MR400).
FID shimmed on 1H. I see a strong lock signal. Doped Water
sample at 90% with 34 power and 35 gain. manually adjusted Z0 to
be on resonance. The lock phase is very unstable. it drifts quite
dramatically. Also, running "Find Z0" fails. reporting the lock
S/N is too weak.
I can observe a 2H signal using "lk". It was weaker than in the
past. I had to bump the tpwr to 52 to get a decent 300us signal.
Im having autotune issues...so trying to run the calibration scripts for Z0
are proving problematic. I have managed to manually see a 2H grad shim
profile. im attempting to map. Gradient power seems to need
calibrating. as the 2H profile was too narrow.
Lost of fun things to keep me occupied.
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Received on Fri May 24 2024 - 11:27:27 MST