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| Result: Searchterm 'tr'
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Renate Bloemer
Mon. 13 Nov.06,
19:29
[Reply (1 of 2) to:
'T1 FAT SAT PRE AND POS GADO'
started by: 'CLAUDIO RIBERTI'
on Tue. 24 Oct.06]
 Category:
Contrast Agents
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| T1 FAT SAT PRE AND POS GADO |
The contrast agent causes this difference. Contrast agents reduce the T1 time in tissues where they have accumulated depending on blood flow and vascular permeability. Caused by this, tissues after an application of contrast agents will differ in shortening of the T1 time, and the same imaging parameters result in other image appearance.
Some helpful links for musculoskeletal imaging and Fat Sat:
http://www.moffitt.org/moffittapps/ccj/v8n3/pdf/221.pdf
http://www.medical.siemens.com/siemens/en_US/gg_mr_FBAs/files/MRI_Hot_Topics/MRI_HotTopics_Skinny_on_FatSat_engl.pdf
Hope this helps
Renate Bloemer
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Reader Mail
Mon. 30 Oct.06,
16:25
[Reply (1 of 2) to:
'interleaved slices and mean intensity difference in adjacent slices'
started by: 'Reader Mail'
on Wed. 4 Oct.06]
Category:
General
|
| interleaved slices and mean intensity difference in adjacent slices |
With interleaved slice acquisition for example in each TR first the odd slices, and then the even slices are acquired. Differences in signal intensity may occur by changes between these acquisitions (like movement), especially with a long TR. In particular, for fMRI sequences with interleaved slice acquisition a slice time correction is recommended to get accurate measurements.
However, I think "large" signal intensity differences with interleaved slices (except fMRI) are rarely seen with usual sequences and sufficient processing (interpolation) algorithms.
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CLAUDIO RIBERTI
Tue. 24 Oct.06,
19:24
[Start of:
'T1 FAT SAT PRE AND POS GADO'
1 Reply]
Category:
Contrast Agents
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| T1 FAT SAT PRE AND POS GADO |
ANYBODY COULD GIVE ME A GOOD ANSWER WHY T1 FAT SAT IMAGES PRE AND POS GADO ARE SO DIFERENT CONCERNING TO THE MUSCULATURE, FAT AND OTHER STRUCTURES ?
THE MUSCLES ARE DARKER AND BETTER VISUALIZED,THE FAT COMES ALSO DARKER LIKE WE HAVE SEEN A SERIE WITH OTHER WEIGHT.
PS:.THE SERIES ARE EXACTLY THE SAME AND WERE PRINTED WITH THE SAME LEVEL AND WIDTH.
PS2:. IS THIS THE SAME THAT OCCURS IN T1 FAT SAT OF THE ANKLE WHERE THE LIQUID APPEARS BRIGHT ?
PS3:. HOW COULD I EXPLAIN BOTH ?
THANKS.
CLAUDIO
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Marco Costa
Sun. 22 Oct.06,
10:27
[Start of:
'MRA'
2 Replies]
Category:
Protocols
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| MRA |
Hello!
Is my first time in this forum! I read it a lot this forum, is very helpfull for my job!
I have a dificult in my mri machine.
First i would like to now how can i construct a bolus teste manualy! I don't have smart prep. What sequence i must use and what parameters i must choose.
Second, can you expline to me the diference between centric fill of K-space and non centric?
When is the best time to star the sequence after take the time injection.
My regards
Marco Costa
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Reader Mail
Thu. 28 Sep.06,
17:08
[Start of:
'ce enhanced mra'
0 Reply]
Category:
General
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| ce enhanced mra |
can any one explain me the post processing of a contrast enhanced MRA in GE 1.5 WITH EXCITE TECHNOLOGY
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