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| Result: Searchterm 'bolus'
found in 5 messages |
| Result Pages: [1] |
More Results:  Database (24) |
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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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Marco Costa
Sun. 22 Oct.06,
10:27
[Start of:
'MRA'
2 Replies]
Category:
Protocols
|
| MRA |
Hello!
Is my first time in this forum! I read it a lot this forum, is very helpfull for my job!
I have a dificult in my mri machine.
First i would like to now how can i construct a bolus teste manualy! I don't have smart prep. What sequence i must use and what parameters i must choose.
Second, can you expline to me the diference between centric fill of K-space and non centric?
When is the best time to star the sequence after take the time injection.
My regards
Marco Costa
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Reader Mail
Sun. 19 Feb.06,
14:36
[Start of:
'CE-MRA Vasovist protocol'
1 Reply]
Category:
Protocols
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| CE-MRA Vasovist protocol |
We will start soon with Vasovist (MS-325) for peripheral CE-MRA with moving table. Expecting higher resolution due to longer possible scan times - but discussing timing and needed post processing.
Is bolus timing needed - is fluoroscopic triggering possible - for the arterial phase?
Any experiences with this contrast agent, a good scan protocol or some good sources about Vasovist?
Anything appreciated!
Greetings
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Sue Johanson
Wed. 27 Apr.05,
03:36
[Reply (1 of 4) to:
'Contrast MRA COW.'
started by: 'Marilia White'
on Thu. 3 Mar.05]
Category:
Contrast Agents
|
| Contrast MRA COW. |
Hi,
seems crazy, you should have many undesirable veins! We run a 3D TOF MRA of the circle of willis without contrast with best results (1.5T and 3T).
Contrast enhanced 3D MRA of the carotids are done with machine injection (never with a butterfly!), automated bolus detection and a flow of 3ml/sec and 25 ml Gad. If no bolus detection program is available, look for the delay with a test bolus of 2ml. With a high resolution scan, both carotids and circle of willis are assessable. The use of a set like Smartset for the injection is helpful if no power injector is available.
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Tomas Randell
Thu. 16 Dec.04,
05:03
[Reply (2 of 4) to:
'CE MRA of the Liver'
started by: 'bob mitchell'
on Sun. 5 Dec.04]
Category:
Applications and Examinations
|
| CE MRA of the Liver |
Like lily lily we use a muliphase MRA with 3 phases (artery, portal vein and late phase).
We use an amount of 30 ml Gadolinium with an injection rate of 5 ml/sec. With this high flow rate, you get a more concentrated bolus and therefore a higher contrast for the second phase. We use CENTRA k-space acquisition and reduce the scan time with SENSE (a parallel imaging technique like ASSET ), this will help for a better timing.
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