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| Result: Searchterm 'Artifact'
found in 33 messages |
| Result Pages: 1 2 3 4 5 [6] 7 |
More Results:  Database (166) News Service (6) Resources (10) |
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Margret Miller
Sun. 24 Aug.08,
20:48
[Reply (1 of 3) to:
'Artifact'
started by: 'adhm ahmed'
on Sat. 23 Aug.08]
 Category:
Artifacts
|
| Artifact |
Can you describe in more detail and in which cases the artifact occurs? Images would be helpful.
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|  View the whole thread | | |
Reader Mail
Wed. 28 May.08,
20:14
[Reply (1 of 3) to:
'Artifacts'
started by: 'Reader Mail'
on Sun. 25 May.08]
Category:
Artifacts
|
| Artifacts |
Hi,
look for the lamp bulbs or equipment using alternating current inside the room.
Also peripheral equipment, like ECG, pulse oximeters, etc. can cause artifacts.
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| | View the whole thread | | |
Reader Mail
Wed. 4 Oct.06,
17:58
[Start of:
'interleaved slices and mean intensity difference in adjacent slices'
1 Reply]
Category:
General
|
| 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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Tomas Randell
Mon. 20 Jun.05,
19:38
[Reply (1 of 3) to:
'Metalic particles into the cornea'
started by: 'Jorge Cazal'
on Mon. 13 Jun.05]
Category:
Safety
|
| Metalic particles into the cornea |
For my personal opinion, it is not to expect that these microscopic steel particles are a contraindication for an MRI of the head. An injury of the patient by dislocation or
torque presents not a real risk because of the small size.
The possibility of heating is minimal and can be additional lowered by reducing the SAR. Artifacts may reduce the image quality a little, but diagnostic brain imaging is certainly possible. The use of a mid or low field MRI machine will also reduce any risks.
Hope this will help.
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| | View the whole thread | | |
William Flemming
Tue. 29 Mar.05,
02:49
[Reply (1 of 2) to:
'MR image of an eye'
started by: 'Reader Mail '
on Tue. 14 Dec.04]
Category:
Applications and Examinations
|
| MR image of an eye |
Depending on the sequence and the field strength there can be artifacts that look like eye movement and are difficult to separate. To avoid eye movement should the patient not only close the eyes or fix a point, but also with closed eyes think about not to move the eyes.
Other artifacts (e.g. ghosting) can be reduced with fat suppression, reduction of the water fat shift, T1 with a long TE (to reduce the brightness of fat), and/or a higher matrix.
Also the perfect positioning of the coil and a homogeneity correction will improve the image quality. I do not know a post processing program that removes those artifacts.
Regards
Bill
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