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| Result: Searchterm 'MRI'
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peter hobden
Wed. 14 Feb.07,
15:35
[Reply (1 of 3) to:
'Geometric distortion'
started by: 'ergun ahunbay'
on Tue. 2 Jan.07]
 Category:
Artifacts
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| Geometric distortion |
Dear Listers,
I have some questions about the image distortions in MRI:
1) Are the magnetic field inhomogeneities the only cause of image distortions? Does RF-inhomogeneities cause distortions or just signal inaccuracies?
There are other factors that can affect the /amount/ of distortion. Run an EPI sequence and change the bandwidth and see the image change shape.
There are other causes of image distortion which are not necessarily directly related to field homogeneity.
It is a complicated question you are asking here!
2) Is it accurate to say that a spiral sequence would not have distortion due to magnetic field inhomogeneity(, but it would have blurring). Would there be image geometric distortions with a spiral imaging?
I guess you are talking about spiral filling of k-space?? The sampling time reduction will help to reduce distortion to some extent.
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|  View the whole thread | | |
peter hobden
Wed. 14 Feb.07,
15:27
[Reply (1 of 2) to:
'MRI Marker'
started by: 'Tian Ming'
on Mon. 22 Jan.07]
Category:
Applications and Examinations
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| MRI Marker |
There is a company which make MRI skin markers but they are poor for fat-sat sequences.
I have emptied oil capsules of fish oil and instead added my own ingredients into them, according to the specific sequence I use.
Try:
*Pure Water
*V V Dilute MRI contrasts
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| | View the whole thread | | |
abdul halim ahmad
Wed. 31 Jan.07,
14:40
[Reply (4 of 6) to:
'Examinations of children'
started by: 'George'
on Sat. 22 Nov.03]
Category:
Applications and Examinations
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| Examinations of children |
always smile to children can be extra bonus for child to enter the mri room
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| | View the whole thread | | |
ergun ahunbay
Tue. 2 Jan.07,
19:20
[Start of:
'Geometric distortion'
2 Replies]
Category:
Artifacts
|
| Geometric distortion |
Dear Listers,
I have some questions about the image distortions in MRI:
1) Are the magnetic field inhomogeneities the only cause of image distortions? Does RF-inhomogeneities cause distortions or just signal inaccuracies?
2) Is it accurate to say that a spiral sequence would not have distortion due to magnetic field inhomogeneity(, but it would have blurring). Would there be image geometric distortions with a spiral imaging?
thank you very much in advance
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Steven Smith
Wed. 20 Dec.06,
22:46
[Start of:
'scan matrices and steps'
2 Replies]
Category:
General
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| scan matrices and steps |
Hello,
I've just joined this forum because I'm a Japanese-English translator and often translate MRI related material, but my knowledge is a bit patchy. I have a rather basic question. Part of a product specification goes (translated):
Scan Matrix: 64 – 1024 x 64 – 1024; 4 steps per
I assume this is 4 steps per scan, but wanted to check just in case. Also could anyone explain what is meant by steps in this context?
Thanks very much
Steven Smith
www.fwtranslations.co.uk
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