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| Result: Searchterm 'ffe'
found in 134 messages |
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More Results:  Database (446) News Service (436) Resources (66) |
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danilo Scelfo
Wed. 29 Sep.10,
12:15
[Start of:
'How does TE affect DWI acquisition?'
1 Reply]
 Category:
Sequences and Imaging Parameters
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| How does TE affect DWI acquisition? |
Hi folk! Just a breath question: how does TE affect conventional sequence (single shot SE-EPI) for DWI acquisition? In particular, how would two acquisitions differ from each other if acquired with TE=90/106ms respectively (being equal all the other parameters, i.e. TR=11s, same FOV, …)? Thanks for any opinion you will give me. Danilo.
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Reader Mail
Wed. 4 Oct.06,
17:58
[Start of:
'interleaved slices and mean intensity difference in adjacent slices'
1 Reply]
Category:
General
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| interleaved slices and mean intensity difference in adjacent slices |
On the crosstalk artifact page it says that when interleaved slice acquisition is used, there can be large mean intensity difference between adjacent slices. I would appreciate it if someone could let me know what is the theoretical basis for this and what is meant by "large".
Thanks!
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阿立 王
Mon. 12 May.08,
08:14
[Start of:
'the phase effect of grads pulse'
0 Reply]
Category:
Basics and Physics
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| the phase effect of grads pulse |
hello ,everyong.I am a student from china,and recently I am writting a paper about above subject,but i can not found more resources.
who can help me?
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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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