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| Result: Searchterm 'Resolution'
found in 18 messages |
| Result Pages: [1] 2 3 4 |
More Results:  Database (150) News Service (40) Resources (13) |
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Sai Mahathi Yasa
Sun. 29 Mar.15,
04:58
[Start of:
'Re: Calculation of Resolution and Tr'
0 Reply]
 Category:
Basics and Physics
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| Re: Calculation of Resolution and Tr |
Tacq= 32s
Gradient strength= 10mT/m
Matrix size=256x256 pixels
dwell time= 0.03ms
How to calculate resolution and Tr?
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andrea schmidt
Mon. 6 Jul.09,
10:38
[Start of:
'question about resolution in an MRI'
0 Reply]
Category:
Basics and Physics
|
| question about resolution in an MRI |
Hello,
I have to hold a lecture about the resolution in MRIs.
My problem is, that I do not really understand if the resolution in an MRI can be compared with the "standard" resolution terms that you learn in physics. For example that the resolution equals 1/the distance of two points that you can see seperately.
Those equations go for optic devices like microscopes, right? Do they also account for an MRI?
And generally, how do you define resolution in an MRI and how can you enhance or change it in the practical use?
It would be great if you could help me. I have been looking for more information on the internet, but I didn't really find websites that answered my questions. Maybe you know some informative and helpful sites?
Thanks.
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Emma Jackson
Mon. 1 Apr.24,
08:30
[Reply (1 of 2) to:
'GE MRI software question'
started by: 'V Bro'
on Thu. 31 Aug.23]
Category:
General
|
| GE MRI software question |
"Hi there! I'm familiar with MRI GE systems, and I'd be happy to assist you with your query about complete disks. When it comes to MRI technology, ensuring optimal performance and functionality is crucial for accurate imaging results. Feel free to reach out with any specific questions you have regarding the GE MRI system from 6 PM to 10 PM because I work in an imaging center in Sugarland , and I'll do my best to provide assistance. Looking forward to helping out!"
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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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Artemiy Artemiy
Wed. 21 Mar.12,
11:44
[Reply (3 of 4) to:
'How to estimate areas of lesion on MRI in multiple sclerosis'
started by: 'Artemiy Artemiy'
on Fri. 16 Mar.12]
Category:
Applications and Examinations
|
| How to estimate areas of lesion on MRI in multiple sclerosis |
I am ready to present some links:
Cognitive correlates of supratentorial atrophy on MRI in multiple sclerosis
www.ncbi.nlm.nih.gov/pubmed/11589650
Cerebral atrophy and disability in relapsing-remitting and secondary progressive multiple sclerosis over four years
www.ncbi.nlm.nih.gov/pubmed/12617263
Resolution-dependent estimates of lesion volumes in magnetic resonance imaging studies of the brain in multiple sclerosis
onlinelibrary.wiley.com/doi/10.1002/ana.410380509/abstract
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