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| Result: Searchterm 'sequence'
found in 105 messages |
| Result Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 [18] 19 20 21 |
More Results:  Database (378) News Service (28) Resources (10) |
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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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Tian Ming
Mon. 22 Jan.07,
10:23
[Start of:
'MRI Marker'
1 Reply]
Category:
Applications and Examinations
|
| MRI Marker |
Are there any MRI markers that are visible on all sequences, small, flat, cheap and self-adhesive?
Vitamin E or fish oil capsules work mostly well, but the signal is suppressed on sequences with fat saturation.
To mark a small region they are too big and
dent the skin where fixed.
Thankful for every suggestion and friendly greetings to all.
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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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Renate Bloemer
Mon. 13 Nov.06,
19:46
[Reply (1 of 3) to:
'MRA'
started by: 'Marco Costa'
on Sun. 22 Oct.06]
Category:
Protocols
|
| MRA |
A test bolus helps to get the delay at which time the CE-MRA sequence has to be started. The sequence needed is a one-slice dynamic fast gradient echo sequence (if possible with fat suppression or subtraction) and a temporal resolution of 0.5 to 1.5 sec. This thick slice is placed over the vessel of interest and the dynamic is started simultaneous with a small (1-2ml) bolus of Gad.
In the follow up you can see at which time the bolus is visible. If it is not clear to differentiate, a ROI measurement will help. The starting time depends on the k-space filling. Around the peak of the highest intensity, the contrast information should be read out (with "centric" at the beginning of the sequence).
Centric k-space filling order means that the central lines of the k-space are filled in the first seconds after starting the scan. Depending on the equipment, there is more than one non-centric order, for example linear, where the central lines are filled in the middle of the scan time.
Hope this helps.
Renate Bloemer
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Sheila Edenfield
Thu. 2 Nov.06,
16:03
[Start of:
'MRV--Phase contrast question'
0 Reply]
Category:
General
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| MRV--Phase contrast question |
What exactly is an MRV sequence on an Hitachi Airis II .3 Tesla?
I realize it has to do with the venus system but if anyone knows anything I sure would appreciate your time and knowledge concerning this.
Also The physician I am working under(Neurologist), he would like to see my MRAs done with a phase encoding protocall? Is there such a thing? I hope someone out there can give me some knowledgable info on this. Thank you Sheila/Georgia :)
Sheila Edenfield
Airis II Hitachi .3T
Stockbridge Ga
sheilamritechnologist@yahoo.com
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