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| Result: Searchterm 'ffe'
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Brian Smith
Wed. 16 Nov.22,
12:37
[Reply (1 of 2) to:
'MRI contrast side effects'
started by: 'Mo Do'
on Fri. 27 May.22]
 Category:
General
|
| MRI contrast side effects |
Unless you are on cancer medication, there are no delayed side affects from contrast. It is a heavy metal and some is retained.
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Herbert Müller
Thu. 5 May.22,
01:33
[Reply (11 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 |
Hello,
I dont know if anyone has, for him/herself, answered this question. I know it is an old thread. But this is the question which also botheres me the most in NMR/MRI.
I refer now to a picture, which is illustrated in the book from Tim Claridge (High resolution NMR techniques).
Here, a RF pulse (lets say a 90 degree pulse) is said to have two effects on the initial z-magnetisation. First, it allows energy transfer between the two Zeeman-states in a way, that i equalizes the population difference between them. So there is no z- magnetisation anymore after 90 degree pulse. Th esecond effect is, that it induces phase-coherence. And this phase coherence is then responsible for the x-magnetisation, which is measured.
And now I have the same question. Why is this phase coherence lost (or is it not?), when applying an initial 180-degree pulse. Understandable for me is, why the population difference in z is reversed, but I dont understand, why there is no xy magnetisation anymore.
Maybe some of you have figured out the answer in the meantime?
Greetings
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Davit Kharshiladze
Sun. 20 Mar.22,
03:22
[Start of:
'Slice Interpolation'
0 Reply]
Category:
Sequences and Imaging Parameters
|
| Slice Interpolation |
Hod do I disable slice interpolation in FFE3D sequence on Toshiba vantage 3T
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Avi Rokach
Mon. 7 Dec.20,
09:45
[Start of:
'MRI and hearing loss'
1 Reply]
Category:
General
|
| MRI and hearing loss |
Hi,
I have tinnitus and pressure in the ear for 2.5 months and hearing loss in the left ear in 3khz (20db)
I was with 2 doctors and they give me a different MRI
The first gives me an MRI for the brain and Skull base and the second gives me an MRI for the ears?
What is the difference between them and what is best for me to find the tinnitus case?
Thanks!
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CT tutor
Tue. 31 Mar.20,
03:14
[Start of:
'How do I pass the CT registry?'
0 Reply]
Category:
General
|
| How do I pass the CT registry? |
The ARRT exam for the CT Registry is not easy, but with the right tools, you can successfully pass the test and move into a rewarding career.
1. Destress.
2. Find the right study material.
3. Fuel your brain.rn4. Sleep.
5. Attend the Tuffest Stuff Ct Registry Review
Live Lecture Seminar.
CTtutor
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