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Result: Searchterm 'sequence'
found in 105 messages |
Result Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 [17] 18 19 20 21 |
More Results: Database (378) News Service (28) Resources (10) |
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andri anto
Fri. 25 May.07, 06:39
[Reply (1 of 2) to: 'What´s this in L3?' started by: 'Rob van den Dobbelsteen' on Sat. 10 Mar.07]
Category:
Applications and Examinations |
What´s this in L3? |
You just give t2 sagital WI, that not enough for determined what the problem in L3 spine, better you asked to radiologist and show all the MRI picture. Cause i saw there lession in corpus L3 and bulging in discus L3-l4 (HNP). To know more about something in Corpus L3 you must have all sequence in MRI Lumbal exam.
Andri
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andri anto
Mon. 14 May.07, 14:26
[Start of: 'Help!!!' 0 Reply]
Category:
Sequences and Imaging Parameters |
Help!!! |
Anyone!!! give me data about Sequences and Imaging Parameters for MRI Thosiba. I'm at drandri_77@yahoo.com
Help me please....
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Anne Nelson
Tue. 8 May.07, 02:09
[Start of: 'Proton Density and FOV' 2 Replies]
Category:
Sequences and Imaging Parameters |
Proton Density and FOV |
I've been told that proton density sequences don't work well with a large field of view. (approx 350-400) Is this the case, and why?
Thanks in advance,
Annika
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Reader Mail
Tue. 6 Mar.07, 22:48
[Start of: 'fluid PD vs T2 weighting' 1 Reply]
Category:
Sequences and Imaging Parameters |
fluid PD vs T2 weighting |
Can anyone explain me, why - considering SE sequences with the same TR - fluid in a PD weighting (short TE) should have less signal than in a T2 weighting (long TE)? eg:
Fig 10, p 1397; radiographics resident tutorial: contrast mechanisms in spin echo MR imaging; Radiographics 1994; 14; pp 1389-1404
I would expect that the signal intensity of any tissue (regardless of it Proton density of T2-relaxation time) should decrease with increasing echo time.
Thank you
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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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