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| Result: Searchterm 't2'
found in 66 messages |
| Result Pages: 1 2 3 4 5 [6] 7 8 9 10 11 12 13 14 |
More Results:  Database (155) News Service (28) Resources (5) |
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Eric Gonzalez
Wed. 10 Oct.12,
20:06
[Reply (1 of 2) to:
'Brain T2FS postcontrast'
started by: 'kaisa bente'
on Thu. 27 Jan.11]
 Category:
Applications and Examinations
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| Brain T2FS postcontrast |
Gadolinium relaxation times are too short for T2 weighted imaging, so T2 weighted is not tipically performed after contrast (unless used as a delay to give contrast time to peak before T1 FS is obtained).
Also I have never worked at any facility that uses T2 fat sat imaging on the brain. Not a whole lot of fat in the brain region!
FLAIR imaging is the norm...but I could stand corrected.
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|  View the whole thread | | |
Anna Lena Golay
Wed. 25 Jan.12,
20:59
[Reply (3 of 7) to:
'Imaging optic neuritis'
started by: 'Karen Lesley'
on Wed. 18 Jan.12]
Category:
General
|
| Imaging optic neuritis |
A 2-3 mm STIR sequence through the optic nerves may show the characteristic high-signal intensity of optic neuritis. Gadolinium enhanced T1-weighted fat-saturated (to suppress the bright signal of the orbital fat tissue) images of the orbits show the inflammation of the optic nerve. White matter lesions, which denote a higher risk of developing MS, are typical imaged with FLAIR and T2-weighted images (hyperintense lesions), or show enhancement of T1-weighted images postcontrast.
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| | View the whole thread | | |
Peter Jefferson
Tue. 24 Jan.12,
21:33
[Reply (1 of 7) to:
'Imaging optic neuritis'
started by: 'Karen Lesley'
on Wed. 18 Jan.12]
Category:
General
|
| Imaging optic neuritis |
A coronal STIR or T2 weighted sequence with fat suppression is useful to show an opticus neuritis.
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| | View the whole thread | | |
Elise Gough
Fri. 4 Mar.11,
13:56
[Reply (2 of 8) to:
'6-1.5T MAGNETS, DIFFERING GRADIENTS'
started by: 'Elise Gough'
on Wed. 23 Feb.11]
Category:
Applications and Examinations
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| 6-1.5T MAGNETS, DIFFERING GRADIENTS |
Thank you for your response. Our group is strict about FOV, thickness/gap parameters being the same across all magnets. One magnet has slew rate of 77, FRFSE T2, TE 85,TR 3500 Classic Fat supressed images which are pristine, vs magnets of 120 slew rate same parameters look signal starved. So gradient strength makes a speed difference, not an image quality difference?
Elise Gough RT(R)(CT)(MR)
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| | View the whole thread | | |
Steven Ford
Thu. 3 Mar.11,
20:28
[Reply (1 of 8) to:
'6-1.5T MAGNETS, DIFFERING GRADIENTS'
started by: 'Elise Gough'
on Wed. 23 Feb.11]
Category:
Applications and Examinations
|
| 6-1.5T MAGNETS, DIFFERING GRADIENTS |
I assume that you mean a t2 fat suppressed sequence. Differing gradient strengths have only an indirect effect on these images. The fat saturation sequences require additional pulses which take time to execute; stronger gradient systems can execute these pulses faster.
If you see different results, it can be caused by a number of factors; if you can describe the differences, that would be helpful. Generally speaking, the quality of the magnet homogeneity makes a big difference. If the small FOV scans (wrist) look different from magnet to magnet, that's probably not the cause.
You should ask your MRI applications specialist about this, and pay attention to the TE and bandwidth. Are the FOV and number of steps the same?
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