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| Result: Searchterm 'Echo'
found in 43 messages |
| Result Pages: 1 [2] 3 4 5 6 7 8 9 |
More Results:  Database (305) News Service (7) 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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gianluca turcatel
Mon. 10 Jan.22,
13:21
[Start of:
'IDEAL sequence help'
1 Reply]
Category:
General
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| IDEAL sequence help |
I was given MRI images of the liver of patients, taken with LMS IDEAL optimized low flip. I need to calculate the pdff. I have 72 images per patient with echotime ranging from 1.2ms to 11.2 ms. How do I identify which is the fat, water OP,IN images?
Thank you so much. and yes I am relative new to MRI imaging.
THANKS!
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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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Angie Pope
Tue. 23 Oct.18,
16:55
[Start of:
'DWI of the prostate'
0 Reply]
Category:
Applications and Examinations
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| DWI of the prostate |
In need of a protocol for the prostate. Our system is a 1.5 GE Signa Excite 12.0 software.
Under the diffusion options screen the only B-value options are 1000,1500, and 2000.
Should Dual Spin Echo option be selected ?
Main question relates to post processing of the DWI to ADC. Under Functool, what is a good threshold # to choose ?
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