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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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Belinda Williams

Mon. 21 Jul.14,
21:44

[Start of:
'?'
1 Reply]


 
  Category: 
Coils

 
?
I work on GE excite open speed. On lumbar spine t2 axials, it appears like the coil looses signal and makes image dark and grainy. The coil gives good signal on the other sequences and tests good when engineer has tested it. The sag t2 is bright like it should but ax is dark. Any ideas why?
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Mario Terakaj

Thu. 6 Feb.14,
08:50

[Start of:
'Tirm'
0 Reply]


 
  Category: 
Sequences and Imaging Parameters

 
Tirm
Dears!!
I try to understand why TIRM have a long TR and long TE ( value of T2 image ) but sequences bring a T1 mark

Thanks!!!
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aaron yonts`

Thu. 19 Sep.13,
07:56

[Reply (1 of 3) to:
'why there is T2* but not T1*'
started by: 'Isa Toni Toni'
on Wed. 24 Jul.13]


 
  Category: 
Sequences and Imaging Parameters

 
why there is T2* but not T1*
i may just be giving general info but a t2* is aquired from a gradient echo compared to a t2 with a spin echo. according to mri in practice a t2* can help show some things a normal t2 would not, such as ms plaques in a cervical spine
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Brent Johnson

Wed. 21 Aug.13,
19:38

[Start of:
'Hitachi Airis II question'
0 Reply]


 
  Category: 
Sequences and Imaging Parameters

 
Hitachi Airis II question
I have a question for a Hitachi Airis II .3T non-upgraded gradients
On T2 FSE sequences especially on thumb sagittal slices. Image quality very poor, grainy. What is ideal bandwidth and TE settings for improving image quality? Also is positioning and angle of slice a factor in image quality. The closer the anatomy is to edge of coil, does that effect image quality.

Thanks Brent
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