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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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Steven Smith

Wed. 20 Dec.06,
22:46

[Start of:
'scan matrices and steps'
2 Replies]

 
  Category: 
General
 
scan matrices and steps
Hello,
I've just joined this forum because I'm a Japanese-English translator and often translate MRI related material, but my knowledge is a bit patchy. I have a rather basic question. Part of a product specification goes (translated):
Scan Matrix: 64 – 1024 x 64 – 1024; 4 steps per

I assume this is 4 steps per scan, but wanted to check just in case. Also could anyone explain what is meant by steps in this context?

Thanks very much

Steven Smith
www.fwtranslations.co.uk
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jedrzej kosiuk

Wed. 20 Dec.06,
15:51

[Start of:
'SPIO in vivo tracing of stem cells in humans'
1 Reply]

 
  Category: 
Contrast Agents
 
SPIO in vivo tracing of stem cells in humans
I am planning clinical trial with autologous stem cell implantation by patients in end stage PAD (Rutherford category IV and V). I would like to label the bone marrow stem cells to be able to trace them with MRI. Anybody knows some reasonable solutions or helpful literature?
please email me: jedrzej.kosiuk@meduniwien.ac.at
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marleen michels

Wed. 22 Nov.06,
14:59

[Start of:
'visualizing corticospinal tracts'
2 Replies]

 
  Category: 
Applications and Examinations
 
visualizing corticospinal tracts
I' m a student master of medical imaging, and I was wondering which MRI technics are used to visualise the corticospinal tracts? Diffusion tensor imaging is one of them, I think...
kind regards
marleen michels, kuleuven.
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Giorgos Menikou

Sat. 27 May.06,
07:16

[Start of:
'GE Signa Excite 1.5 T HD spectroscopy fine shimming'
0 Reply]

 
  Category: 
Spectroscopy
 
GE Signa Excite 1.5 T HD spectroscopy fine shimming
Can anyone please give directions for how to use the SpectroScan Tool in spectroscopic sequences.
It is necessary to optimise the shimming in spectroscopy in order to get well defined sharp peaks in the metabolites spectrum.
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