Does anyone know for sure if a shim map is off center slightly left in a negative direction...and I assume it is a centering issue do you whether it would be probe up/down?
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[KPWU blog] [PyMOL] gradient background color
gradient background color
Starting at *PyMOL 1.4, *single color for the background is no longer the only choice. By using 3 PyMOL commands, the gradient background color can be easily shown. The only thing users have to know is that command “ray” doesn’t support this gradient color yet. So if you type “ray” in the pymol terminal , http://stats.wordpress.com/b.gif?host=kpwu.wordpress.com&blog=76132&post=619&subd=kpwu&ref=&feed=1
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nmrlearner
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11-15-2011 11:36 PM
[Question from NMRWiki Q&A forum] Problem with the gradient shimming
Problem with the gradient shimming
Dear Friends,
I've recently encountered a problem with gradient shimming that has never happened to me before. I can't clearly determine what caused it but it certainly didn't involve anybody manipulating with the probe. Here's the symptom: when running the gmapz experiment, the Z-profiles (before and after gradient) look like this:
http://img833.imageshack.us/img833/2213/zprofilef.png
As you can see the second profile (after the gradient) is distorted at the left edge (more or less severely, depending on a sample - here it's just a tiny "step")....
nmrlearner
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10-11-2011 06:35 PM
[Question from NMRWiki Q&A forum] Where can I find current shim values in Bruker Paravision?
Where can I find current shim values in Bruker Paravision?
Hello,
I am a novie to the field. I am trying to record the change in settings post shimming using Bruker ParaVision. I only have access tot he Bruker format files (acqp, reco, 2dseq etc.). I was wondering where in these files can I find the shim values (Z2, XZ, YZ etc.)
Thanks.
nmrlearner
News from other NMR forums
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01-05-2011 11:03 AM
[Question from NMRWiki Q&A forum] Where can I find shim current values in Bruker
Where can I find shim current values in Bruker
Hello,
I am a novie to the field. I am trying to record the change in settings post shimming using Bruker ParaVision. I only have access tot he Bruker format files (acqp, reco, 2dseq etc.). I was wondering where in these files can I find the shim values (Z2, XZ, YZ etc.)
Thanks.
[U. of Ottawa NMR Facility Blog] Gradient Spin Echoes for Selective Excitation
Gradient Spin Echoes for Selective Excitation
Shaped excitation pulses can replace the non-selective hard pulses typically used in a one-pulse measurement to achieve selective excitation. Another method of achieving selective excitation is the gradient spin echo using a selective 180° pulse. This technique is demonstrated in the figure below. http://4.bp.blogspot.com/_5wBTR2kKTqA/S_UxeG5oXdI/AAAAAAAAAzc/BHWef-Tse7s/s400/grad_spin_echo.jpgA non-selective hard 90°x pulse is first given followed by a pair of identical pulsed field gradients sandwiching a soft selective 180° pulse about the y...
gradient shim map question
Linear Mode
