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Reader Mail

Mon. 19 Mar.07,
08:56

[Reply (1 of 2) to:
'Quench'
started by: 'mak stavrak'
on Sat. 17 Feb.07]

 
  Category: 
Safety
 
Quench
That is really too much.
Did the quenches occur during helium filling? A not correct vacuum in the filling equipment can cause it.
Other possibilities are icing by condensation, leakage or other damage. Ask the manufacturer or service engineer of your MRI scanner if they can install a quench monitoring to find out the reason.


Good luck
 View the whole thread
Rob van den Dobbelsteen

Sat. 10 Mar.07,
16:33

[Start of:
'What´s this in L3?'
1 Reply]

 
  Category: 
Applications and Examinations
 
What´s this in L3?
I´m a Dutch Physiotherapist and not trained in reading MRI images.
Yesterday my last client brought a CD with MRI-images on his first visit. He experiences a lot of lumbar pain, takes lots of painkillers and had a HNP operation earlier.

There is something strange about L3. Can you tell me what it is?

The doctor only told him there was no reason to think he had neurological problems but never mentioned this.

Pictures can be seen here:
http://www.fysioforum.nl/e107_plugins/forum/forum_viewtopic.php?957
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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.
 View the whole thread
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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