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| Result: Searchterm 'Spin'
found in 58 messages |
| Result Pages: 1 2 3 4 5 6 7 8 9 10 [11] 12 |
More Results:  Database (332) News Service (64) Resources (27) |
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Mike Parks
Fri. 6 Apr.07,
18:53
[Start of:
'Need Help'
0 Reply]
 Category:
Applications and Examinations
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| 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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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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Johan J
Thu. 8 Feb.07,
20:51
[Reply (2 of 3) to:
'visualizing corticospinal tracts'
started by: 'marleen michels'
on Wed. 22 Nov.06]
Category:
Applications and Examinations
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| visualizing corticospinal tracts |
With DTI you're able to visualize the coricospinal tracts. Not to difficult actually, you'll just need the proper gear and post processing software.
Cheers
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| | View the whole thread | | |
Jennifer Jackson
Fri. 21 Jul.06,
04:44
[Reply (1 of 2) to:
'Phase encoding'
started by: 'guillaume bierry'
on Fri. 7 Jul.06]
Category:
General
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| Phase encoding |
Wow this is a long subject, First you have to under stand how the 3 main gradients are used. (slice select, Freq, then phase)
So you are use 1 of the gradients for your phase encoding. You need to fill the k-space which depends on you matrix. Lets assume you are using 256 (phase). In order to fill K-space you have to have 256 aquistions of the signal. Meaning for each picture (or slice) the signal must be acquire(sampled) 256 times each at a differnt amplitude to put it in a different Line of k-space.
Example- If you are performing a SE(spin echo) you have 1 TR period and 1 TE period (TE=is when the signal is sampled) so you will have to do the TR period 256 times to fill K-space with diffent amplitudes.
There is alot more that I left out. If this did not answer your question let me know
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John Dowling
Tue. 9 May.06,
22:36
[Start of:
'Omniscan Distribution Rate'
1 Reply]
Category:
Contrast Agents
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| Omniscan Distribution Rate |
I was told by the GE rep that Omniscan has a faster distribution rate, that should lend itself to better images/application to specific technologies. Is this claim valid? This is the first I've heard of this type "spin" on contrast agents. <pun intended>
In my experience, I have not seen much difference in image quality from various contrast agents. Any thoughts or experiences are appreciated.
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