|
Magnetic
Resonance -
Technology
Information
Portal |
Welcome to MRI Technology • |
|
|
 | Info
Sheets |
| | | | | | | | | | | | | | | | | | | | | | | | |
 | Out-
side |
| | | | |
|
| | | | | |
| Result: Searchterm '3t'
found in 41 messages |
| Result Pages: 1 2 3 4 [5] 6 7 8 9 |
More Results:  Database (23) News Service (45) Resources (6) |
|
|
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.
|
|  View the whole thread | | |
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?
|
| | View the whole thread | Reply to this thread
(login or register first) | |
Karen Lesley
Sat. 21 May.11,
16:03
[Start of:
'Best pulse sequences for spinal cord demyelination?'
3 Replies]
Category:
Applications and Examinations
|
| Best pulse sequences for spinal cord demyelination? |
Hi all. I wonder if you can help? A friend has asked me to recommend the best protocols to detect demyelination. She is about to pay a fortune for a private 3T scan and doesn't want to waste her money. Problem is, although I know a fair bit about the brain, I know next to nothing about the spinal cord! I understand that FLAIR is not optimal in the spinal cord, but I'm getting mixed messages about what is from my reading. Is it FSE?! Any advice really gratefully received! Thanks :-)
|
| | View the whole thread | Reply to this thread
(login or register first) | |
Reader Mail
Wed. 13 Apr.11,
19:19
[Start of:
'NEUROSTIMULATOR WIRES'
1 Reply]
Category:
Safety
|
| NEUROSTIMULATOR WIRES |
I RECENTLY HAD A PATIENT WHO HAD HIS NEUROSTIMULATOR REMOVED BUT HAD 2 WIRES/LEADS STILL IMPLANTED AT THE L4-L5 DISC SPACE LEVEL. DR.SHELLOCKS SAFETY BOOK STATES GET PLAIN RADIOGRAPHS TO VERIFY THAT THERE ARE NO BROKEN LEADS. IS THIS CONSIDERED A BROKEN LEAD IF UNIT IS REMOVED AND WIRES/LEADS ARE STILL PRESENT? I HAVE FOUND THIS TO BE A VERY GRAY LEVEL TRYING TO DETERMINE IF PATIENT IS SAFE TO SCAN AT 1.5T OR 3T. PLEASE HELP
|
| | View the whole thread | Reply to this thread
(login or register first) | |
Don LaVille
Tue. 21 Dec.10,
20:57
[Reply (1 of 3) to:
'Muscle shading in 3T Images'
started by: 'Travis Conley'
on Thu. 21 Oct.10]
Category:
Applications and Examinations
|
| Muscle shading in 3T Images |
This artifact is known as the dielectric effect. It is a phenomena to all magnets. At 1.5T the dielectric effect is at 60cm so when we scan at a FOV of 40 or less we don't see it. At 3t the dielectric effect is reduced to 30cm so we now see it when using a FOV of 30 or more. There is no way to get rid of it that I know of and you will see an increase with patients with more magnetic suseptibility (ie. patients with ascities, and pregnant patient). You could try using Surface Coil Intensity Correction (SCIC) and it will help to even out the extreme dark and light in your image. Some vendors will suggest using a Fat Sat pad to help reduce this artifact. I have tried it with little success.
Looking at your image, it looks like you were scanning on a GE 3T HDX. I hope that the vendors will have a fix for this artifact soon. For right now though we are just dealing with it. I hope this helps.
|
| | View the whole thread | | |
| |
| | Result Pages : 1 2 3 4 [5] 6 7 8 9 | |
|
| |
 | Look
Ups |
| |
|
MR-TIP.com uses cookies! By browsing MR-TIP.com, you agree to our use of cookies. | | | [last update: 2024-02-26 03:41:00] |
|
|
bottom
top
