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| Result: Searchterm 'Bo'
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Kimberly Wilridge
Wed. 27 Sep.23,
19:37
[Reply (1 of 2) to:
'GE Signa - 17,18,19 Phantoms Found looking for 1'
started by: 'Kimberly Wilridge'
on Fri. 26 Jul.13]
 Category:
Coils
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| GE Signa - 17,18,19 Phantoms Found looking for 1 |
I submitted this question years ago. Answer to this question and anyone else with an issue in SNR testing is: it was the phantom. GE coils as with all coils have SET phantoms that should be used due to the system programming. It looks for the gaps/spaces between the phantom balls, blocks, etc. At that time of question above the FE doing the testing was using USAI phantoms (which are large blocks) and GE CTL phantoms are small/mid size balls contained in an acrylic piece. After complete rebuild of 25 CTL's figured I got bench testing these things down to a science, with T1/T2 values higher than OEM. I can thank that FE, because it made me improve my reverse engineering skills, which I've applied to so much since then.
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Dan Lopez
Sun. 27 Aug.23,
00:03
[Start of:
'Improving MEDIC/MERGE/M-ffe and GRE/FFE image quality'
1 Reply]
Category:
Sequences and Imaging Parameters
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| Improving MEDIC/MERGE/M-ffe and GRE/FFE image quality |
I work on an Ingenia Elition Philips scanner. I'm having trouble with Axial C-spine sequences for both M-ffe and FFE. On the M-ffe there is always motion in the cord and the contrast is poor. With the FFE the closer we get to the lungs the worse the quality becomes. There is usually loss of signal and the image doesn't look uniform. I've tried a bunch of different parameter combinations to try giving it more signal and contrast while decreasing the motion in the cord but it never seems to look that good. Any suggestions would be appreciated.
Mffe & FFE
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Brian Smith
Wed. 16 Nov.22,
12:33
[Start of:
'Siemens Espree Help'
1 Reply]
Category:
Protocols
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| Siemens Espree Help |
Hello all. My facility switched from Siemens Espree 1.5T to Philips Ingenia 1.5T a year ago. I recently picked up a second job at a small imaging facility. I have forgot almost everything about this machine and the protocols saved on the machine are horrific! The full time tech that works there is green and doesn't know what can and can't be changed.
Does anyone have any protocol information for this machine? I just don't have the time to rebuild all these protocols and am looking for a good base or some that a tech has tuned to their liking. Any help is greatly appreciated!
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max messerschmidt
Fri. 28 Oct.22,
07:55
[Start of:
'backproblems -- mrt'
2 Replies]
Category:
General
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| backproblems -- mrt |
Hi Everyone,rnrnMy Doctor is on vacation and I have no one to look at these images that have been made of me.rnrnI have backpain and am worried it might be something not great.rnrnCan anyone tell me something about these images?rnrnrnThank You very much
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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
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| 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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