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| Result: Searchterm 'sequence'
found in 106 messages |
| Result Pages: 1 2 3 [4] 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 |
More Results:  Database (378) News Service (28) Resources (10) |
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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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Davit Kharshiladze
Sun. 20 Mar.22,
03:22
[Start of:
'Slice Interpolation'
0 Reply]
Category:
Sequences and Imaging Parameters
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| Slice Interpolation |
Hod do I disable slice interpolation in FFE3D sequence on Toshiba vantage 3T
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Lorenzo Nigris
Sun. 28 Nov.21,
03:43
[Start of:
'ASL Labeling Slab'
0 Reply]
Category:
Site Planning and Specifications
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| ASL Labeling Slab |
Dear all,rnrnI am currently about to set up a pulsed ASL(pASL) sequence on a 3T Siemens MAGNETOM Prisma. Unfortunately, during the plan of the sequence I cannot visualize the labeling slab. Does anybody know how to visualize and set it up? (see Picture)rnrnThanksrn
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Steven Ford
Fri. 26 Oct.18,
02:29
[Reply (1 of 2) to:
'When to shim?'
started by: 'Matt H'
on Fri. 27 Oct.17]
Category:
General
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| When to shim? |
you ask a complex question. Any sequence that is not a standard spin echo can benefit from shimming, but its not always worth it.
If you are scanning a knee in the center of the magnet, or nearly so, you might not see much difference in gradient echo scans, which in general are quite sensitive to shim problems. But if you are doing fat-water separation or fatsat images, you will see a difference even in this example.
Because hardware varies, its hard to say in one blanket statement for every case. For sure, do it on fatsat or fat-water imaging. The next most sensitive studies are off-center imaging such as shoulders. Beyond that, you should experiment a little. Of course, erring on the side of caution is a good idea.
Steven Ford
Professional Imaging Services, Inc.
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