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| Result: Searchterm 'AIN'
found in 209 messages |
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More Results:  Database (389) News Service (888) Resources (128) |
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sivagami samy
Thu. 26 Nov.09,
13:31
[Start of:
'EPILEPSY -MRI'
2 Replies]
 Category:
Applications and Examinations
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| EPILEPSY -MRI |
sir/ Madam,
i am m.phil student, today only i register here. i need one help. i need brain MRI image of the patients who affected by epilepsy. i need lot of images or my research. So anybody help me how to get those images.. if you have the images please send me. it will help me a lot.. i expect a good result from this forum members.i feel very happy to join in this site. waiting for reply...
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James R
Sun. 13 Sep.09,
04:30
[Reply (2 of 3) to:
'ARMRIT exam'
started by: 'Reader Mail'
on Sun. 28 Jun.09]
Category:
Jobs
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| ARMRIT exam |
i have the lippincott, the black & yelow one that compliments MRI in practice, and the MIC course. the MIC course may confuse you if you went to a full program. i didn't being cross trained to scan on the job; so i had nothing to go by. But i'm having mixed reviews on MIC a friend of mine who we went to the sam x-ray school 2 years ago got MIC and ended up taking a MRI class thats like 15 sessions cause he didn't like MIC
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| | View the whole thread | | |
hithesh n
Fri. 11 Sep.09,
08:33
[Reply (2 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 |
Hi Bjorn,
I might be able to explain this even though its too late.
Initially a 90 excitation pulse is applied, the Hydrogen protons precess in the XY plane. Now they are spinning in sync in the XY or transverse plane. This is where they emit the RF signal.
But pretty soon, the neighboring hydrogen protons go out of sync, ie one is going faster and the other is going slower. This is similar to runners running a race in a track, they all start at the same time(assume) but after a couple of secs, some run faster than the other. The faster ones are in the front and the slower ones are in the back.
How do you bring them back into sync?
This is where the 180 excitation comes into play.
Now you apply a 180 pulse, this is equivalent to making the runners run in opposite direction. Now suddenly, the slower runners are gonna be in the front and faster ones in the back. Eventually the faster ones catchup and all of them are gonna be in sync. They go out of sync again.
They go out of sync bcoz the magnetic field applied is not uniform and due to material (tissues, bones etc). Local variations in the field causes the protons to go out of sync.
The 180 brings them in to coherence, not instantly but they do catch up and become coherent.
The 90, brings them into coherence almost instantly.
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Reader Mail
Mon. 7 Sep.09,
01:04
[Reply (1 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 |
Yes, I have been searching for the answer to this question all summer. I never find the answer, and then keep coming back to it. You are right, I can find no literature that explains this. If anyone could answer it would be appreciated.
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| | View the whole thread | | |
Christine Row
Tue. 1 Sep.09,
19:11
[Reply (1 of 4) to:
'Please recommend materials sensitive to T1-weighted MRI'
started by: 'Cindy Duan'
on Wed. 12 Aug.09]
Category:
Basics and Physics
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| Please recommend materials sensitive to T1-weighted MRI |
Beside diluted contrast agents, you can use fat containing substances, for example fish-oil filled capsules.
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