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| Result: Searchterm 'tr'
found in 420 messages |
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More Results:  Database (1011) News Service (1852) Resources (540) |
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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 | | |
Johan J
Thu. 8 Feb.07,
20:51
[Reply (2 of 3) to:
'visualizing corticospinal tracts'
started by: 'marleen michels'
on Wed. 22 Nov.06]
Category:
Applications and Examinations
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| visualizing corticospinal tracts |
With DTI you're able to visualize the coricospinal tracts. Not to difficult actually, you'll just need the proper gear and post processing software.
Cheers
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| | View the whole thread | | |
Johan J
Thu. 8 Feb.07,
20:48
[Reply (2 of 3) to:
'scan matrices and steps'
started by: 'Steven Smith'
on Wed. 20 Dec.06]
Category:
General
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| scan matrices and steps |
It means that the matrix is variable, so you can choose to have 256, 260, 264 etc matrixes. This is than again part of how advanced the fourier transformation algorithm is.
Cheers
BTW Matrixes are just a number, and actually say nothing at all regarding resolution...yess FOV devided by matrix gives you a pixel size which is actually the interesting part.
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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 | |
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