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| Result: Searchterm 'Gradient'
found in 38 messages |
| Result Pages: 1 2 3 [4] 5 6 7 8 |
More Results:  Database (316) News Service (6) Resources (7) |
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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
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| 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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Azza Ahmed
Thu. 8 Jul.10,
10:42
[Start of:
'exceeding slew rates'
0 Reply]
Category:
Sequences and Imaging Parameters
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| exceeding slew rates |
Can someone please let me know what happens to the MRI signal intensity if any of the gradient's slew rate was exceeded?
Azza AhmedrnPhD student
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Mike ferty
Sat. 10 Apr.10,
17:39
[Start of:
'MRI terminology need clarification'
0 Reply]
Category:
Basics and Physics
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| MRI terminology need clarification |
Hi,
This is a very wonderful site and I have learned alot from your definition database. I do have a question with some of the terminologies that I cannot find in your database, here are the ones:
What is:
Alpha pulse?
Inversion Pulse?
z-gradient pulse?
positive x-gradient pulse?
negative x-gradient pulse?
phase encoding pulse?
Refocusing gradient pulse?
Can you please help me know what there terms meant?
Many Thanks!
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Reader Mail
Wed. 30 Dec.09,
01:26
[Reply (6 of 12) to:
'90 excitation pulse vs 180 inversion pulse'
started by: 'Bjorn Redfors'
on Sat. 27 Jun.09]
Category:
Basics and Physics
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| 90 excitation pulse vs 180 inversion pulse |
Hello: would be probably convenient to reformulate the original question, or at least to clarify a little.... Why are the "spins" "brought into coherence" by the 90 excitation pulse?. For instance, a hard 90 ex pulse itself does not affect the coherence of spins in normal conditions, nor brough them into coherence. However, it may add an additional decoherence if the RF field is not homogeneous or, in case it would be applied under the presence of a strong static gradient. Same thing for the 180 deg pulse.
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Sherri Simpson
Fri. 9 Oct.09,
21:56
[Start of:
'GE HDe 1.5 scanner'
1 Reply]
Category:
Devices, Scanner, Machines
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| GE HDe 1.5 scanner |
How well does this scanner perform with 50 gradients vs 120 gradients most scanners have?
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