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New acceleration techniques will :
reduce scan times 
cause artifacts 
increase expenses 
be useful if you have a lot of experience 
doesn't do much 
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Sion Rogers

Wed. 21 Feb.07,
20:42

[Reply (1 of 3) to:
'Claustrophobia'
started by: 'Monica Muller'
on Tue. 16 Mar.04]

 
  Category: 
Patient Care and Comfort
 
Claustrophobia
Dear Monica,

My name is Sion Emlyn Rogers. I am currently a student at Columbia University. I doing a piece on MRI claustrophobia and the way people cope with it.

I was hoping you would be willing to speak with me.

My email address is ser2129@columbia.edu

Many thanks

Sion
 View the whole thread
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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peter hobden

Wed. 14 Feb.07,
15:27

[Reply (1 of 2) to:
'MRI Marker'
started by: 'Tian Ming'
on Mon. 22 Jan.07]

 
  Category: 
Applications and Examinations
 
MRI Marker
There is a company which make MRI skin markers but they are poor for fat-sat sequences.

I have emptied oil capsules of fish oil and instead added my own ingredients into them, according to the specific sequence I use.

Try:

*Pure Water
*V V Dilute MRI contrasts
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Johan J

Thu. 8 Feb.07,
20:51

[Reply (2 of 3) to:
'visualizing corticospinal tracts'
started by: 'marleen michels'
on Wed. 22 Nov.06]

 
  Category: 
Applications and Examinations
 
visualizing corticospinal tracts
With DTI you're able to visualize the coricospinal tracts. Not to difficult actually, you'll just need the proper gear and post processing software.

Cheers
 View the whole thread
Johan J

Thu. 8 Feb.07,
20:48

[Reply (2 of 3) to:
'scan matrices and steps'
started by: 'Steven Smith'
on Wed. 20 Dec.06]

 
  Category: 
General
 
scan matrices and steps
It means that the matrix is variable, so you can choose to have 256, 260, 264 etc matrixes. This is than again part of how advanced the fourier transformation algorithm is.

Cheers

BTW Matrixes are just a number, and actually say nothing at all regarding resolution...yess FOV devided by matrix gives you a pixel size which is actually the interesting part.
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