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| Result: Searchterm 'Resolution'
found in 18 messages |
| Result Pages: 1 2 [3] 4 |
More Results:  Database (150) News Service (40) Resources (13) |
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Daniel Robertson
Thu. 23 Jul.09,
04:54
[Start of:
'MRI Spinal Ligaments'
0 Reply]
 Category:
Applications and Examinations
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| 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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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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Steven Smith
Thu. 21 Dec.06,
11:23
[Reply (1 of 3) to:
'scan matrices and steps'
started by: 'Steven Smith'
on Wed. 20 Dec.06]
Category:
General
|
| scan matrices and steps |
Ah, just to answer my own question, I'm guessing this means the scan resolution goes up in increments of 4.
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| | View the whole thread | | |
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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Bear DuDu
Sun. 4 Jun.06,
09:30
[Reply (1 of 3) to:
'ZIP512'
started by: 'Shaun Schofield'
on Thu. 30 Mar.06]
Category:
Sequences and Imaging Parameters
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| ZIP512 |
when you use low matrix (lower than 256x256), you may use zip512 to increase the display resolution of image.
if the matrix is larger than 256x256, the system automatically use zip512.
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