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| Result: Searchterm 'tr'
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Iosif Sogolov
Sun. 3 Jan.10,
20:49
[Reply (7 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 |
prior 90: spins precess around B0 uncoherently, there for the sum of their projections on TRANSVERSE plane is ZERO, they are "unfocused" in this plane. 90 and right after: all above mentioned spins are forced to rotate around B1, it should be stressed - in only one for ALL of them chosen direction of rotation (depends of B1 direction) to the TRANSVERSE plane, they all will come compact to this plane and now they do give here NET MAGNETIZATION, become "focused".
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|  View the whole thread | | |
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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Reader Mail
Wed. 30 Dec.09,
01:11
[Reply (3 of 4) to:
'contrast administration'
started by: 'Reader Mail'
on Sun. 27 Dec.09]
Category:
Contrast Agents
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| contrast administration |
yes for mr registry,study preperations.
thanks so much for your responses.
anyone take registry lately,how was it?
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| | View the whole thread | | |
Reader Mail
Tue. 29 Dec.09,
21:37
[Reply (2 of 4) to:
'contrast administration'
started by: 'Reader Mail'
on Sun. 27 Dec.09]
Category:
Contrast Agents
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| contrast administration |
This depends on the contrast agent and its concentration. The accompanying package insert of this contrast agent should be followed. This is for testing purposes, or?
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Adrian Roman
Sat. 26 Dec.09,
13:26
[Start of:
'MRI data before 2D FFT'
0 Reply]
Category:
Basics and Physics
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| MRI data before 2D FFT |
Hi,
I need some raw data in k-space, that is, before applying 2D FFT on it. I want to implement a program that does the transfrom, in order to exemplify the process. Is there such thing available?
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