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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 




 
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't2'
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John Smith

Wed. 11 Nov.15,
22:14

[Start of:
'Faster pulse sequences'
0 Reply]


 
  Category: 
General

 
Faster pulse sequences
Hi,
I have been learning about faster MRI sequences and have two questions

1) With "Fast (Turbo) gradient echo", in which we apply a spoiler gradient, do we not eventually end up with no longitudinal magnetization because TR is always shorter than T1? Hence shouldn't we eventually get no signal at all?


2) in SSFP (Steady-state free precession) we can apply an RF pulse of 90 degrees (in which T1>>T2) to get heart-blood contrast. How is this any different to a standard spin-echo sequence in terms of timing?

Thank you
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David Russell

Mon. 29 Jun.15,
15:31

[Start of:
'FLAIR'
0 Reply]


 
  Category: 
General

 
FLAIR
What are the causes of high FLAIR signal? Is there a list? Or is it just everything that is high on T2 and is not pure CSF fluid would be high.


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Abhi Batra

Sun. 10 May.15,
17:12

[Start of:
'Is there T1*?'
0 Reply]


 
  Category: 
General

 
Is there T1*?
We always talk about T2*. Is there anything like T1*. If yes than what is difference between T1 and T1*
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May Shoemaker

Fri. 6 Feb.15,
02:40

[Start of:
'MRI questions'
0 Reply]


 
  Category: 
General

 
MRI questions
I had MRI of the femur and pelvis. Can you explain abnormal findings:

"Marrow signal abnormality in the metaphysis and diaphysis of both femora without lesion. Possible red marrow conversion".

Specifics of MRI show:
MRI shows patchy low T1 and high T2 marrow signal in meta and diaphysis in both femur. At mid diaphyseal level, curvilinear bright T2 and STIR signal noted in the intramedullary cavity. No lesion noticed.

Thanks for any insight. Is there another website I could use for more information?
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Steven Ford

Tue. 5 Aug.14,
20:01

[Reply (1 of 2) to:
'?'
started by: 'Belinda Williams'
on Mon. 21 Jul.14]


 
  Category: 
Coils

 
?
Belinda,

It would be helpful if you would add a photo, even if you take a cellphone photo of your screen and blot out the name.

You did not say, but is this a new problem?

In general, if one orientation looks worse than others, you may have a magnet shim problem; you can crudely test this yourself by using a cylinder type phantom and doing an identical scan in three planes. A shim problem would affect T2's more than T1 or PD images also.

There is always a possibility that your sequences have changed without you realizing it too; check this even if you don't know how that would have happened.
 
 

Steven Ford
Professional Imaging Services, Inc.
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