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| Result: Searchterm 'Shimming'
found in 10 messages |
| Result Pages: [1] 2 |
More Results:  Database (71) News Service (1) Resources (2) |
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Reader Mail
Thu. 1 Oct.09,
02:08
[Start of:
'RF shimming'
1 Reply]
 Category:
Basics and Physics
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| RF shimming |
What is RF shimming? Is it available in a clinical scanner?
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Giorgos Menikou
Sat. 27 May.06,
07:16
[Start of:
'GE Signa Excite 1.5 T HD spectroscopy fine shimming'
0 Reply]
Category:
Spectroscopy
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| GE Signa Excite 1.5 T HD spectroscopy fine shimming |
Can anyone please give directions for how to use the SpectroScan Tool in spectroscopic sequences.
It is necessary to optimise the shimming in spectroscopy in order to get well defined sharp peaks in the metabolites spectrum.
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katharine cummings
Thu. 18 Oct.07,
12:07
[Start of:
'Manual Shimming -Picker Polaris'
0 Reply]
Category:
Devices, Scanner, Machines
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| Manual Shimming -Picker Polaris |
I have been trying to manual shim for fat-saturation sequences. Can someone give me some advise. Thank You
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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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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
|
| 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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