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| Result: Searchterm 'Artefact'
found in 3 messages |
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More Results:  Database (2) Resources (1) |
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Matthijs Lipperts
Wed. 7 Jan.09,
11:05
[Start of:
'SPAIR movement artefact'
0 Reply]
 Category:
Artifacts
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| SPAIR movement artefact |
Dear all,
When scanning wrists in our Avanto MR always the penultimate slice in the transversal series shows a movement artefact. This happens with all patients and always the penultimate slice. We found out that using regular fat saturation this does not occur, with SPAIR (which is preferable because of the frequent susceptibility artefacts in arms/wrists) however it happens all the time. The simple solution for our radiology staff is to use normal fat saturation instead of SPAIR, however we are intriged by this problem and were hoping that anyone also experienced this problem and maybe found an explanation.
Because it happens in only 1 slice we are suspecting some kind of interference of the slice selection pulse with the SPAIR pre-pulses.
Any input is appreciated,
thanks in advance, Matthijs
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Bob Owen
Sun. 10 Apr.22,
11:49
[Start of:
'Query on PROPELLER enhancement'
0 Reply]
Category:
Artifacts
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| Query on PROPELLER enhancement |
I looked at an MRI from 2016 I originally had for a tongue swelling to see if it might show evidence for Optic neuritis which I believe I had at that time. I noticed coronal slices show the outer circumference of the optic nerve as especially bright and ragged or irregular along much of the length (both eyes). This looks like donut sign for ON but I wonder if it could be an artefact of the imaging process as it used something called PROPELLER which I believe enhances the image. An axial slice also appears to show the tram track sign. Can anyone comment. I have uploaded a screenshot of just a single coronal slice
See uploaded slice
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John Jackson
Fri. 12 Sep.08,
08:40
[Reply (1 of 2) to:
'flow arifact'
started by: 'Neeta Vyas'
on Tue. 9 Sep.08]
Category:
Artifacts
|
| flow arifact |
I wonder if it has anything to do with the placement (location) of the wrist within the scanner. Assuming that your using the scanners coil as a reciever- Are you scanning close to the edge of the scanner? The sat band also has to be within the FOV/limits of the scanner.
I suggest trying different locations in the scanner (or using a smaller FOV). It would be strange if you had artefacts in some writs and not in others.
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