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| Result: Searchterm 'Imaging'
found in 89 messages |
| Result Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 [14] 15 16 17 18 |
More Results:  Database (547) News Service (1520) Resources (268) |
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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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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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marleen michels
Wed. 22 Nov.06,
14:59
[Start of:
'visualizing corticospinal tracts'
2 Replies]
Category:
Applications and Examinations
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| visualizing corticospinal tracts |
I' m a student master of medical imaging, and I was wondering which MRI technics are used to visualise the corticospinal tracts? Diffusion tensor imaging is one of them, I think...
kind regards
marleen michels, kuleuven.
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Renate Bloemer
Mon. 13 Nov.06,
19:29
[Reply (1 of 2) to:
'T1 FAT SAT PRE AND POS GADO'
started by: 'CLAUDIO RIBERTI'
on Tue. 24 Oct.06]
Category:
Contrast Agents
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| T1 FAT SAT PRE AND POS GADO |
The contrast agent causes this difference. Contrast agents reduce the T1 time in tissues where they have accumulated depending on blood flow and vascular permeability. Caused by this, tissues after an application of contrast agents will differ in shortening of the T1 time, and the same imaging parameters result in other image appearance.
Some helpful links for musculoskeletal imaging and Fat Sat:
http://www.moffitt.org/moffittapps/ccj/v8n3/pdf/221.pdf
http://www.medical.siemens.com/siemens/en_US/gg_mr_FBAs/files/MRI_Hot_Topics/MRI_HotTopics_Skinny_on_FatSat_engl.pdf
Hope this helps
Renate Bloemer
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jing cai
Fri. 20 Oct.06,
15:47
[Reply (1 of 3) to:
'LUNGS MRI'
started by: 'CLAUDIO RIBERTI'
on Fri. 20 Oct.06]
Category:
General
|
| LUNGS MRI |
You are right! It is called the hyperpolarized nobel gases, mostly Helium-3 and Xenon-129. They are many centers around the world are conducting such experiments. Many techniques using the gas have been developed to investigate pulmonary pathphysiological changes such as ventilation, diffusion, elastis, etc. As an example, you can go the below link for detailed information:
http://imaging.med.virginia.edu/hyperpolarized/index.htm
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