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| Result: Searchterm 'Bo'
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shari robinson
Mon. 14 Sep.09,
19:24
[Reply (10 of 21) to:
'MRI registry equations'
started by: 'Donna Nusser'
on Tue. 18 Aug.09]
 Category:
Basics and Physics
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| MRI registry equations |
Donna, don't give up and be intimidated. Look at it like it is a challenge. Have a plan. I can send you the study guide I have, it goes through all the content specs for the exam board. MR is hard but if it wasn't everyone would do it right??? Hang in there! E-mail me if you want the notes,
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|  View the whole thread | | |
shari robinson
Mon. 14 Sep.09,
19:20
[Reply (9 of 21) to:
'MRI registry equations'
started by: 'Donna Nusser'
on Tue. 18 Aug.09]
Category:
Basics and Physics
|
| MRI registry equations |
Don't stress about the MIC program. It is just an overview of what is covered on the registry. Go the the content specs from ARRT.org in MRI and study that way. You will be better prepared. Also MRI in Practice is a great book. After reading the MIC about 4 times with a month or so in between, it all makes sense but it didn't at first so I share your frustration. It also helps if you are working in the modality and are familiar with MRI background. Good luck, let me know if you need any help.
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| | View the whole thread | | |
James R
Sun. 13 Sep.09,
04:24
[Reply (5 of 21) to:
'MRI registry equations'
started by: 'Donna Nusser'
on Tue. 18 Aug.09]
Category:
Basics and Physics
|
| MRI registry equations |
i don't know if it's just me but i feel the questions on the MIC course are way off topic sometimes. when i answer these questions myself, i feel like i know nothing cause the questions IMO are being asked in the "beating around the bush method"
i've been told that the registry is more basic than the questions they ask. pus they cover way too much than the ARRT exam question breakdown.
i'm going to use the black and yellow & lippincott book plus the answered question MIC from here on in.
can anyone who knows of or has taken the registry recently than can clarify this.
any advise or info will be greatly appreciated cause i'm pretty intimitaded by this test and i want it done by the end of this year
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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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| | View the whole thread | | |
Donna Nusser
Sun. 23 Aug.09,
20:25
[Reply (3 of 21) to:
'MRI registry equations'
started by: 'Donna Nusser'
on Tue. 18 Aug.09]
Category:
Basics and Physics
|
| MRI registry equations |
Thank you very much, to both of you. Bridget, good luck on the exam!
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