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| Result: Searchterm 'Signa'
found in 78 messages |
| Result Pages: 1 2 3 4 5 6 7 8 9 10 11 12 [13] 14 15 16 |
More Results:  Database (382) News Service (60) Resources (16) |
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Reader Mail
Wed. 17 Oct.07,
19:34
[Start of:
'DWI'
1 Reply]
 Category:
Applications and Examinations
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| DWI |
What does normal signal in the diffusion-weighted images mean?
Would a large brain tumor show normal signal in diffusion-weighted images?
Thanks
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Roberto Reyes
Wed. 6 Jun.07,
03:20
[Start of:
'Purchase Decision'
2 Replies]
Category:
Devices, Scanner, Machines
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| Purchase Decision |
Hello, I am in the process to buy a MRI. I have quotes from GE Signa 1.5T HD, and Siemens Symphony 1.5T (NO TIM)
Can any give me comments about each system? Want to know which system you recommend and why?
Regards
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Mike Parks
Fri. 6 Apr.07,
18:53
[Start of:
'Need Help'
0 Reply]
Category:
Applications and Examinations
|
| Need Help |
I had an MRI yesterday and I have alot of metal in my neck due to extensive surgery such as anterior fusion from c4 to c7. Yesterdays results indicate I have atrophy of the spinal cord from C4-5 to C7 with a thin cord and high signal compatible with myelomalacia. Herniation of C3-$ that compresses the spinal cord. Central protrusion of the C2-3 and C7-T1 discs. My question is. My neck burns as if on fire inside. Is this something that will go away? I have and do have severe pain 24/7 but I've never had this kind of pain. If possible please email me at oceansmove07@aol.com if you know what's happening. Thank you for any help you may have and I wish everyone a lighter today, a brighter tomorrow and a future filled with joy and happiness.
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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
|
| 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
|
| 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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