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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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Karen Lesley

Mon. 23 Jan.12,
11:02

[Reply (1 of 2) to:
'Gadolinium - blood brain barrier'
started by: 'Reader Mail'
on Mon. 23 Jan.12]

 
  Category: 
General
 
Gadolinium - blood brain barrier
Gadolinium cannot normally cross the bbb. It does when there is a breach though, and this shows up as a bright white spot on T1 images.

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Adana Osco Barras

Tue. 3 Jan.12,
21:09

[Reply (1 of 2) to:
'Hyperintense blood vessels in SE'
started by: 'Peruvumba Jayakumar'
on Thu. 29 Dec.11]

 
  Category: 
Sequences and Imaging Parameters
 
Hyperintense blood vessels in SE
Prolonged T1 relaxation times, decreased T1 tissue contrast, and increased susceptibility rnare typical effects at high field MRI.rnDue to the longer T1 times at 3T, the signal rnintensity inside the vessels is preserved even in smaller vessels. Try TR 700, TE 10.rnInversion recovery sequences are very well suited for optimal gray to white matter contrast, but enhancement after administration of gadolinium may not be visible.
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Peruvumba Jayakumar

Thu. 29 Dec.11,
06:38

[Start of:
'Hyperintense blood vessels in SE'
1 Reply]

 
  Category: 
Sequences and Imaging Parameters
 
Hyperintense blood vessels in SE
I am troubled by the blood vessels appearing bright on routine SE T1w images of the brain on 3T TIM system.
How can I avoid it?
Can I substitute T1 SE by T1 IR as a part of routine protocol?
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kaisa bente

Thu. 27 Jan.11,
22:28

[Start of:
'Brain T2FS postcontrast'
1 Reply]

 
  Category: 
Applications and Examinations
 
Brain T2FS postcontrast
What is the advantage of T2 FS imaging of the brain if 3 planes of postcontrast T1's are obtained.
Thanks.
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