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| Result: Searchterm 'Sequences'
found in 59 messages |
| Result Pages: 1 2 3 4 5 6 7 8 [9] 10 11 12 |
More Results:  Database (188) News Service (6) Resources (8) |
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Reader Mail
Sun. 6 Jul.08,
08:14
[Start of:
'hydatid cyst'
1 Reply]
 Category:
Applications and Examinations
|
| hydatid cyst |
please any one tell me the appearance of H.C. in MRI sequences.
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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
|
| 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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Jenny Jordan
Sat. 17 Nov.07,
20:11
[Reply (2 of 4) to:
'Haste and Rare sequences'
started by: 'Elena sussi'
on Tue. 13 Nov.07]
Category:
Sequences and Imaging Parameters
|
| Haste and Rare sequences |
Hi Elena,
you can find the different names for the same sequences and options used by manufacturers at: http://www.mr-tip.com/serv1.php?type=cam .
The manufacturers have in principle similar sequences with small differences. So, as you mentioned you can take "sequences as HASTE" or "sequences type RARE".
However, you can lead back these sequences also to the fundamental sequence type FSE ( fast spin echo: http://www.mr-tip.com/serv1.php?type=seq&sub=12 ). Fast sequences as HASTE ( http://www.mr-tip.com/serv1.php?type=db1&dbs=haste ) are especially useful in cases of movement caused by their single shot technique: http://www.mr-tip.com/serv1.php?type=db1&dbs=Single%20Shot%20Technique .
Hope this helps
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| | View the whole thread | | |
katharine cummings
Thu. 18 Oct.07,
12:07
[Start of:
'Manual Shimming -Picker Polaris'
0 Reply]
Category:
Devices, Scanner, Machines
|
| Manual Shimming -Picker Polaris |
I have been trying to manual shim for fat-saturation sequences. Can someone give me some advise. Thank You
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Oleg Borodin
Thu. 9 Aug.07,
13:46
[Start of:
'T1 measurements on 1.5T scaner'
0 Reply]
Category:
Basics and Physics
|
| 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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