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| | | MRI Forum
'pulse sequences' | | |
| Result: Searchterm 'pulse sequences'
found in 8 messages |
| Result Pages: 1 [2] |
More Results:  Database (12) News Service (1) Resources (5) |
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Katelin Lyons
Fri. 27 May.11,
10:07
[Reply (1 of 4) to:
'Best pulse sequences for spinal cord demyelination?'
started by: 'Karen Lesley'
on Sat. 21 May.11]
 Category:
Applications and Examinations
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| Best pulse sequences for spinal cord demyelination? |
Small spinal cord lesions, even if clinically significant, can be due to the low sensitivity of some pulse sequences. Demyelinating lesions are better seen on STIR-FSE images, on which the number of lesions are significantly higher than on FSE, while the FSE and CSE images show approximately equal numbers of lesions.So as STIR-FSE has high sensitivity to demyelinating lesions,it can be considered quite specific and should be included in spinal MRI for assessment of suspected demyelinating disease.
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|  View the whole thread | | |
Steven Ford
Mon. 7 Mar.11,
16:07
[Reply (6 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 |
We maintain a lot of magnets. The leading cause of image quality problems is applications related. Nobody can possibly know all the nuances of pulse sequences by various vendors, software levels, etc. I've heard many times that a certain machine is no good, when in fact the sequences are inefficiently set up. Look there first.
Usually the techs welcome good training. If they don't want to be trained, then you have a problem, but it sounds like this issue is caused by other factors.
If there are differences in baseline quality between the machines, then compensate for that by other means. Signal starvation is easily remedied; keep the quality as consistent as you can and let time be the variable, if it comes down to that.
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| | View the whole thread | | |
Oleg Borodin
Thu. 9 Aug.07,
13:46
[Start of:
'T1 measurements on 1.5T scaner'
0 Reply]
Category:
Basics and Physics
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| T1 measurements on 1.5T scaner |
Dier colleges
I have same trouble with counting T1 of the gadolinium solution.
f.ex.
There are six fantom with gadolinium solution in 0.5, 1, 2, 4, 8 and 16 mmol/l. Fantoms scanned with pulse sequences SE with TR equal 50, 100, 200, 300, 400 ... 4000 ms. For each fantom calculated T1 by iteractive minimizing technique the equation: S(TR)=M0*(1-exp(-TR/T1))
At the result, I have six T1: 72, 170, 255, 403, 725, 1474 ms.
How can I calculate T1 and R1 of the pure solution of contrast media?
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