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| Result: Searchterm 'Shimming'
found in 10 messages |
| Result Pages: 1 [2] |
More Results:  Database (71) News Service (1) Resources (2) |
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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
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| 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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|  View the whole thread | | |
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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| | View the whole thread | Reply to this thread
(login or register first) | |
Angel Lara
Thu. 5 Jan.06,
18:03
[Start of:
'siemens impact expert'
2 Replies]
Category:
Sequences and Imaging Parameters
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| 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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| | View the whole thread | | |
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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| | View the whole thread | |
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