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| Result: Searchterm 'relaxation'
found in 8 messages |
| Result Pages: 1 [2] |
More Results:  Database (90) News Service (8) Resources (3) |
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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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Reader Mail
Tue. 6 Mar.07,
22:48
[Start of:
'fluid PD vs T2 weighting'
1 Reply]
Category:
Sequences and Imaging Parameters
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| 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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Renate Bloemer
Wed. 14 Jun.06,
22:22
[Reply (1 of 2) to:
'T1/T2 relaxation time charts'
started by: 'Reader Mail'
on Fri. 12 May.06]
Category:
General
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| T1/T2 relaxation time charts |
You can find a table of the approximate values of the two relaxation time constants and some relevant formulas on:
http://en.wikipedia.org/wiki/T2*
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