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MRI is trending to low field magnets :
reduced costs will lead to this change 
AI will close the gap to high field 
only in remote areas 
is only temporary 
never 
 
MRI Forum
'Magnet'
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ergun ahunbay

Tue. 2 Jan.07,
19:20

[Start of:
'Geometric distortion'
2 Replies]

 
  Category: 
Artifacts
 
Geometric distortion
Dear Listers,

I have some questions about the image distortions in MRI:

1) Are the magnetic field inhomogeneities the only cause of image distortions? Does RF-inhomogeneities cause distortions or just signal inaccuracies?

2) Is it accurate to say that a spiral sequence would not have distortion due to magnetic field inhomogeneity(, but it would have blurring). Would there be image geometric distortions with a spiral imaging?

thank you very much in advance
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Janie Riley

Thu. 30 Nov.06,
15:18

[Start of:
'.6 phillips protocols low field'
2 Replies]

 
  Category: 
Protocols
 
.6 phillips protocols low field
Hi,
Is there anyone thats know the .6 protocols for a low field magnet?
Thanks,
Janie
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Alex Ruggiero

Wed. 10 May.06,
06:51

[Start of:
'Export Raw Data'
0 Reply]

 
  Category: 
General
 
Export Raw Data
In our institution we work on a Siemens Magnetom Sympony. My question is: is there a way to export raw data? In order to load .dat files in a in-house written IDL software.

Thanks
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Dimitar Todorov

Thu. 9 Mar.06,
06:30

[Start of:
'does the metaloceramic dental crowns are problem for MRI'
1 Reply]

 
  Category: 
Safety
 
does the metaloceramic dental crowns are problem for MRI
Hi everybody,
I don't have an experiance with MRI, and i would like to know about metaloceramic crowns. It is true that they can be dangerous in MRI magnetic field. And if a patient have any metalic oject in the body (bulet or someting else) can it be livetreatening.

Thank you!
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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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