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| Result: Searchterm 'Scan Time'
found in 13 messages |
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More Results:  Database (47) News Service (25) Resources (3) |
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crystal f
Sun. 18 Oct.09,
21:34
[Start of:
'Math equation'
3 Replies]
 Category:
Basics and Physics
|
| Math equation |
Can some one help me w/this question.
From the following parameters what will the scan time be, in minutes, to acquire data?
TR 2000msec FREQUENCY STEPS 256
TE 60msec NEX 2
T1 800msec FLIP ANGLE 90
pixel .95x.95mm PHASE STEPS 192
THANKS
mr registry review
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Daniel Robertson
Thu. 23 Jul.09,
04:54
[Start of:
'MRI Spinal Ligaments'
0 Reply]
Category:
Applications and Examinations
|
| MRI Spinal Ligaments |
I am a graduate student conducting research on spinal ligament mechanics. I am looking for a good imaging sequence to determine the geometry of the supraspinous ligament. I am working with cadaver specimens so patient motion and scan time is of little relevance. I am just looking to get the highest resolution possible so that I can render a 3d volume of the supraspinous ligament. I am using a GE Signa HDx 3T. Thanks.
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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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Michael Oliver
Sat. 27 May.06,
12:54
[Reply (1 of 3) to:
'ETL for a STIR'
started by: 'Shaun Schofield'
on Thu. 30 Mar.06]
Category:
Sequences and Imaging Parameters
|
| ETL for a STIR |
I prefer a range from 5-12 (but using shorter TE and TR). High echo trains can lead to blurring, image noise and contrast inhomogeneities.
Parallel imaging can reduce the longer scan time of low ETLs; also often 1 NSA is enough for sufficient SNR.
Hope this helps!
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Reader Mail
Sun. 19 Feb.06,
14:36
[Start of:
'CE-MRA Vasovist protocol'
1 Reply]
Category:
Protocols
|
| 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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