Dear Colleagues,
We have an intermittent problem with topshim. It often complains like following:
"Performshimming-too many points lost during fit"
Checking the shim report through "topshim gui", it says "echo time must be reduced". I assumed this must be the second echo time is too long, and not enough signal left. I checked the default.par under /opt/topspin2.0/conf/instr/topshim/parameters, and found something like ##$DELAY= (0..7) with values of 0 0.13 0.64 300 900 0.5 5 3e-05 and ##DURMAX= (0..1) with values of 15 60. The other related one is ##$DE= 100. I am not sure which parameter I should change (reduce). After I change it, and save to a new file name say myshim.par. Should I just run "topshim myshim"?
Thank you very much for your input.
Dr. Weidong Hu, NMR Manager
Immunology Division, City of Hope National Medical Center
Tel: 626 256 4673, Ext. 63416, Fax: 626 301 8186
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Received on Fri Jul 01 2011 - 10:20:27 MST