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| Result: Searchterm 'ffe'
found in 134 messages |
| Result Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 [22] 23 24 25 26 27 |
More Results:  Database (446) News Service (436) Resources (66) |
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andri anto
Sun. 6 May.07,
17:01
[Reply (1 of 2) to:
'MRI of nerves in neck????'
started by: 'Mrs Anthony'
on Tue. 24 Apr.07]
 Category:
Applications and Examinations
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| MRI of nerves in neck???? |
Mrs Anthony don,t be afraid, MRI can see nerves in neck without Contrast. Contrast Injection needed if u have trouble in the nerves because of lession unrecognised. They injection Contrast to know what is that lession, It,s Tumor or else. And the important that Contrast injection for MRI is different from X-RAy or CT Scan, Contrast for MRI is more save.
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|  View the whole thread | | |
Johan J
Tue. 20 Mar.07,
15:55
[Reply (1 of 2) to:
'fluid PD vs T2 weighting'
started by: 'Reader Mail'
on Tue. 6 Mar.07]
Category:
Sequences and Imaging Parameters
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| fluid PD vs T2 weighting |
The truth is basicley that different tissues have different relaxation times, the signal of fluid last longer than fat in a T2, so it appears bright.
But also with a "short" TE of 30ms you can already achieve a high signal of fluid, but this is highley dependend of the TR. A long TR - 5000ms - will give you a high signal of fluid. But scantimes won't be acceptable...
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| | View the whole thread | | |
Sion Rogers
Wed. 21 Feb.07,
20:45
[Start of:
'MRI Claustrophobia Interview Request'
1 Reply]
Category:
Safety
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| MRI Claustrophobia Interview Request |
My name is Sion Emlyn Rogers, I am currently a student at the Columbia University Journalism School
I am doing a piece on MRI Claustrophobia and how people cope with it. I am looking for people who have experienced this condition who would be willing to be interviewed (this is a print article).
I would ask them to describe the experience, how it affected them, do they feel reluctant to be scanned etc.
Many thanks
Sion Rogers
ser2129@columbia.edu
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peter hobden
Wed. 14 Feb.07,
15:35
[Reply (1 of 3) to:
'Geometric distortion'
started by: 'ergun ahunbay'
on Tue. 2 Jan.07]
Category:
Artifacts
|
| Geometric distortion |
Dear Listers,
I have some questions about the image distortions in MRI:
1) Are the magnetic field inhomogeneities the only cause of image distortions? Does RF-inhomogeneities cause distortions or just signal inaccuracies?
There are other factors that can affect the /amount/ of distortion. Run an EPI sequence and change the bandwidth and see the image change shape.
There are other causes of image distortion which are not necessarily directly related to field homogeneity.
It is a complicated question you are asking here!
2) Is it accurate to say that a spiral sequence would not have distortion due to magnetic field inhomogeneity(, but it would have blurring). Would there be image geometric distortions with a spiral imaging?
I guess you are talking about spiral filling of k-space?? The sampling time reduction will help to reduce distortion to some extent.
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| | View the whole thread | | |
Renate Bloemer
Mon. 13 Nov.06,
19:46
[Reply (1 of 3) to:
'MRA'
started by: 'Marco Costa'
on Sun. 22 Oct.06]
Category:
Protocols
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| MRA |
A test bolus helps to get the delay at which time the CE-MRA sequence has to be started. The sequence needed is a one-slice dynamic fast gradient echo sequence (if possible with fat suppression or subtraction) and a temporal resolution of 0.5 to 1.5 sec. This thick slice is placed over the vessel of interest and the dynamic is started simultaneous with a small (1-2ml) bolus of Gad.
In the follow up you can see at which time the bolus is visible. If it is not clear to differentiate, a ROI measurement will help. The starting time depends on the k-space filling. Around the peak of the highest intensity, the contrast information should be read out (with "centric" at the beginning of the sequence).
Centric k-space filling order means that the central lines of the k-space are filled in the first seconds after starting the scan. Depending on the equipment, there is more than one non-centric order, for example linear, where the central lines are filled in the middle of the scan time.
Hope this helps.
Renate Bloemer
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