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| Result: Searchterm 'signal'
found in 52 messages |
| Result Pages: [1] 2 3 4 5 6 7 8 9 10 11 |
More Results:  Database (369) News Service (50) Resources (8) |
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Pontus Zaar
Mon. 23 May.16,
20:04
[Start of:
'Tirm dark fluid, fat signal.'
0 Reply]
 Category:
Basics and Physics
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| Tirm dark fluid, fat signal. |
Hi!
On our 3 T siemens machine the protocol tirm dark fluid is often used in neuro.
My question is, why does fat have low signal? Isn't supposed to be only fluid supressed?
Thanks in advance!
/Pontus
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Gina Key
Sat. 27 Jan.24,
09:33
[Reply (1 of 2) to:
'IDEAL sequence help'
started by: 'gianluca turcatel'
on Mon. 10 Jan.22]
Category:
General
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| IDEAL sequence help |
To calculate the Proton Density Fat Fraction (PDFF) from MRI images of the liver acquired using LMS IDEAL (Iterative Decomposition of Water and Fat with Echo Asymmetry and Least Squares Estimation) with optimized low flip angles, you'll typically have multiple image sets corresponding to different echoes. The fat and water signals are separated based on their chemical shift differences. Look for image sets labeled as Water, Fat, or PDFF (Proton Density Fat Fraction). Depending on the software or DICOM tags used, the images may be explicitly labeled, or you may need to review the sequence parameters to determine which set corresponds to fat or water.
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Renate Semrau
Mon. 28 Aug.23,
07:23
[Reply (1 of 2) to:
'Improving MEDIC/MERGE/M-ffe and GRE/FFE image quality'
started by: 'Dan Lopez'
on Sun. 27 Aug.23]
Category:
Sequences and Imaging Parameters
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| Improving MEDIC/MERGE/M-ffe and GRE/FFE image quality |
Hi,
Sequences with multiple echoes are unfortunately sensitive to motion and flow artifacts, with the mFFE the echoes are still cumulated afterwards. The use of the head-neck coil provides better SNR. Important are good flow compensation, rest slab, try out foldover direction l/r vs. a/p. Shimming may help, synergy is sometimes better as clear, don't take too many slices, but maybe the signal loss is also a technical problem. Problems in the lung region are common. In short, we use 2D T2 TSE with continuous flow comp.
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Dan Lopez
Sun. 27 Aug.23,
00:03
[Start of:
'Improving MEDIC/MERGE/M-ffe and GRE/FFE image quality'
1 Reply]
Category:
Sequences and Imaging Parameters
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| Improving MEDIC/MERGE/M-ffe and GRE/FFE image quality |
I work on an Ingenia Elition Philips scanner. I'm having trouble with Axial C-spine sequences for both M-ffe and FFE. On the M-ffe there is always motion in the cord and the contrast is poor. With the FFE the closer we get to the lungs the worse the quality becomes. There is usually loss of signal and the image doesn't look uniform. I've tried a bunch of different parameter combinations to try giving it more signal and contrast while decreasing the motion in the cord but it never seems to look that good. Any suggestions would be appreciated.
Mffe & FFE
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meike carr
Mon. 23 Oct.17,
15:48
[Start of:
'Dialysis pt and Artifacts'
0 Reply]
Category:
General
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| Dialysis pt and Artifacts |
We are having an artifact or loss of signal when we do some dialysis patients spine work. Both of our machines are GE 1.5 and a 3t. It does not happen on all dialysis patients only a few but the images will come out completely dark. We typically do not have any issues with our spine imaging. Has anyone else had this issue or heard of this? Any suggestions on how to fix, it is worse on the 3t of course.
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