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MRI Forum
'Shimming'
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Iosif Sogolov

Tue. 20 Mar.12,
17:16

[Reply (2 of 4) to:
'Who shims MRI systems in Uzbekistan'
started by: 'Reader Mail'
on Wed. 14 Mar.12]

 
  Category: 
Equipment
 
Who shims MRI systems in Uzbekistan
Can shim the magnet. But how do you know you do need the shimming? I am in Germany.
mrirepairer@gmail.com
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Reader Mail

Wed. 14 Mar.12,
20:50

[Start of:
'Who shims MRI systems in Uzbekistan'
3 Replies]

 
  Category: 
Equipment
 
Who shims MRI systems in Uzbekistan
We have MRI equipment (Siemens Concerto) in our hospital and we want to do shimming of this MRI system. Please reply to this thread if you offer a shimming service in Uzbekistan.
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Angel Lara

Thu. 5 Jan.06,
18:03

[Start of:
'siemens impact expert'
2 Replies]

 
  Category: 
Sequences and Imaging Parameters
 
siemens impact expert
Does anyone remember how to shim for silicon on numaris?

I am having trouble with breast implants, I do not know how to adjust center frequency for proper shimming of water and silicon.

Some images look like saline and some look like silicon.

Old machine and do not have accsess to applications. Any help will be greatly appreciated.
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Dan McGuan

Thu. 6 Oct.05,
20:35

[Reply (1 of 2) to:
'Machine Opening artifact'
started by: 'Neil Brice'
on Tue. 28 Sep.04]

 
  Category: 
Artifacts
 
Machine Opening artifact
Neil,

I think you're talking about the edges of the shimmed volume of the magnet, or the coil.

Magnets are shimmed to a specific volume in the field (every model magnet is different). When you attempt to scan an object that reaches the edge of this volume you will see distortion from imaging the unshimmed area of the magnet.

Also shimming large objects that exceed the range of the receiver portion of the coil will cause distortions.

Hopefully this answers your question?

Good Luck,
Dan McGuan
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Schmidt Marga

Sat. 17 Apr.04,
20:41

[Reply (1 of 2) to:
'Moire fringing'
started by: 'Kelly Wimpey'
on Tue. 6 Apr.04]

 
  Category: 
Artifacts
 
Moire fringing
Moire fringes are typical for gradient echo sequences, especially balanced sequences like for example true fisp, bFFE. The reasons are interferences and field inhomogeneities. High order shimming (volume shimming), a more suitable coil, a smaller bandwidth, and scanning not in the edges of the magnetic field will avoid or reduce this artifact. Also parallel imaging techniques can have a positive influence. If this artifact appears, also by using other sequences, a new field adjustment can be necessary (service).
Hope this will help.
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