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| Result: Searchterm 'Suppression'
found in 7 messages |
| Result Pages: [1] 2 |
More Results:  Database (49) News Service (2) Resources (2) |
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Peter Jefferson
Tue. 24 Jan.12,
21:33
[Reply (1 of 7) to:
'Imaging optic neuritis'
started by: 'Karen Lesley'
on Wed. 18 Jan.12]
 Category:
General
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| Imaging optic neuritis |
A coronal STIR or T2 weighted sequence with fat suppression is useful to show an opticus neuritis.
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|  View the whole thread | | |
Steven Ford
Mon. 7 Mar.11,
15:24
[Reply (4 of 8) to:
'6-1.5T MAGNETS, DIFFERING GRADIENTS'
started by: 'Elise Gough'
on Wed. 23 Feb.11]
Category:
Applications and Examinations
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| 6-1.5T MAGNETS, DIFFERING GRADIENTS |
If some of the system are signal starved, it's most likely not due to gradient field strength and speed, but it can be related to that. Like everything else in MRI, it's complex and interdependent.
You're best advised to talk with the apps specialist from the systems that are under-performing, and learn from them what the bandwidth is, and also check the shim. Is the fat suppression OK, but the signal weak, or is the suppression bad also? Do you get a graphic output of the linear (gradient)shim corrrection on the various systems?
It is well worth the money that they might charge, if it comes to that, in order to optimize the use of the systems and for your own education. If the apps person does not know why the other machine works so well, there should be someone higher up in the organization who can shed some light on your question.
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| | View the whole thread | | | |
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Mary York
Wed. 7 Jan.09,
19:22
[Reply (1 of 2) to:
'Best Sequence for Ulnar Collateral Ligament'
started by: 'Sam Shelly'
on Mon. 10 Nov.08]
Category:
Sequences and Imaging Parameters
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| Best Sequence for Ulnar Collateral Ligament |
2D or 3D T2* is a good choice. Depending on the machine, also proton density with fat suppression works well.
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| | View the whole thread | | |
Reader Mail
Wed. 12 Dec.07,
10:07
[Reply (1 of 2) to:
'double ir physic'
started by: 'soontorn siriserussa'
on Sun. 2 Dec.07]
Category:
Sequences and Imaging Parameters
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| double ir physic |
Different types of double inversion recovery (DIR, 2IR) sequences are used to improve the suppression of blood signal (black blood technique) or to null the signals from two different tissue types (e.g. white matter and cerebrospinal fluid).
The black blood technique (used in cardiovascular MRI) works with two inversion pulses, where the first pulse is nonselective and the second pulse is slice-selective. TI is set to a value at which the signal of the recovering inverted blood is zero (http://www.mr-tip.com/serv1.php?type=db1&dbs=Double%20Inversion).
The second technique (also named gray matter only) is used in brain imaging to improve the detection of lesions, for example in the diagnostic of multiple sclerosis. Two 180° pulses with different TI are used to suppress two different types of tissue simultaneously.
Hope this helps
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| | View the whole thread | | |
Jenny Jordan
Mon. 14 May.07,
07:24
[Reply (1 of 3) to:
'Proton Density and FOV'
started by: 'Anne Nelson'
on Tue. 8 May.07]
Category:
Sequences and Imaging Parameters
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| Proton Density and FOV |
Proton Density is often used for musculoskeletal exams with small FOVs. I know no reason why it should not work with a large FOV.
I use PD with fat suppression also for both hips with a FOV of 380 and it works.
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| | View the whole thread | |
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