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New acceleration techniques will :
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peter hobden

Wed. 14 Feb.07,
15:35

[Reply (1 of 3) to:
'Geometric distortion'
started by: 'ergun ahunbay'
on Tue. 2 Jan.07]

 
  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?

There are other factors that can affect the /amount/ of distortion. Run an EPI sequence and change the bandwidth and see the image change shape.

There are other causes of image distortion which are not necessarily directly related to field homogeneity.

It is a complicated question you are asking here!


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?


I guess you are talking about spiral filling of k-space?? The sampling time reduction will help to reduce distortion to some extent.
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abdul halim ahmad

Wed. 31 Jan.07,
14:40

[Reply (4 of 6) to:
'Examinations of children'
started by: 'George'
on Sat. 22 Nov.03]

 
  Category: 
Applications and Examinations
 
Examinations of children
always smile to children can be extra bonus for child to enter the mri room
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Matt B.

Wed. 3 Jan.07,
22:29

[Start of:
'ARMRIT Parenteral Procedures'
2 Replies]

 
  Category: 
General
 
ARMRIT Parenteral Procedures
Hi Folks,

As an ARMRIT technologist; the small clinic I work for is concerned about allowing me to contrast patients as a non-ARRT person. In Washington State, it is my understanding that RT's are legally allowed to push contrast and is common practice.

I read that ARRT now accepts MR as a primary pathway to registration, but I am concerned if I am eligible. Any advice there on the side?

It dawned on me that this may be a problem other ARMRIT's. Any tips?

Thanks a bunch!
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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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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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