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| Result: Searchterm 'Phase'
found in 33 messages |
| Result Pages: 1 2 3 4 [5] 6 7 |
More Results:  Database (285) News Service (25) Resources (11) |
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crystal f
Sun. 18 Oct.09,
21:34
[Start of:
'Math equation'
3 Replies]
 Category:
Basics and Physics
|
| Math equation |
Can some one help me w/this question.
From the following parameters what will the scan time be, in minutes, to acquire data?
TR 2000msec FREQUENCY STEPS 256
TE 60msec NEX 2
T1 800msec FLIP ANGLE 90
pixel .95x.95mm PHASE STEPS 192
THANKS
mr registry review
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n p
Fri. 11 Sep.09,
11:50
[Reply (3 of 12) to:
'90 excitation pulse vs 180 inversion pulse'
started by: 'Bjorn Redfors'
on Sat. 27 Jun.09]
Category:
Basics and Physics
|
| 90 excitation pulse vs 180 inversion pulse |
no hithesh n, that is a 180 rephasing pulse. thats not the question. the question is how is the net magnetization changed from the z plane to the -z plane without causing phase coherence, like the case of an inversion pulse. it is supposedly 2x as long or 2x as strong as the 90 degree pulse, but doesn't cause coherence. Why not is the question.
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Pim vanOoij
Fri. 27 Feb.09,
15:27
[Start of:
'PCA aliasing problem'
2 Replies]
Category:
Artifacts
|
| PCA aliasing problem |
Hi everyone,
Has anybody who reads this ever encountered aliasing in phase contrast measurements in pixels where velocity did not exceed Venc? If so, could this be due to signal leakage of surrounding vessels? Thanks for your help!
Pim
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Sam Shelly
Sun. 2 Nov.08,
23:02
[Reply (2 of 3) to:
'Regarding recovery and decay [basic phycisc]'
started by: 'harry sanders'
on Sat. 7 Jun.08]
Category:
Basics and Physics
|
| Regarding recovery and decay [basic phycisc] |
Right on.
Recovery and delay are two separate physical processes like the last guy said. It had me stumped for a while when I was studying as well. But read carefully and think hard about it...
T1 recovery is the return of net magnetization into alignment with b0.
T2 decay is a totally different process and is, as the previous person said, simply loss of net magnetization in the transverse plain due to dephasing. The more electrons that are precessing in phase in the transverse plane, the stronger the NMV is in that plane. And, hence forth, when the RF pulse terminates, the influence of b0 gradually dephases the electrons in the transverse plane. As they dephase, the transverse NMV decreases accordingly, until the next pulse hits, rephasing the electrons and starting the process all over.
Hope that helps. MRI physics is hairy and boring at times. Load up on expressos to stay awake and stick with it, because studying MRI physics can be like taking a bottle of sleeping pills.
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Stuart Allison
Tue. 16 Sep.08,
12:41
[Start of:
'GE LX MRI Platform?'
3 Replies]
Category:
Devices, Scanner, Machines
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| GE LX MRI Platform? |
I'm working to gain an understanding of MRI equipment, specifically GE equipment, and I'm kind of confused by some of the terms that I see associated with the scanners when they are being listed for sale. Can anybody give me a quick idea about what is being talked about when they are referring to the "LX Platform" on a GE MRI scanner? I think it might have some relationship to phased array channels, but I'm not sure. I have also seen references to the "5X Platform" and the "Excite Platform", are these mutually exclusive to the LX platform (updated/prior models?) Thanks in advance to anyone with some GE experience who can help out.
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