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| Result: Searchterm 'tr'
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William Flemming
Tue. 29 Mar.05,
02:49
[Reply (1 of 2) to:
'MR image of an eye'
started by: 'Reader Mail '
on Tue. 14 Dec.04]
 Category:
Applications and Examinations
|
| MR image of an eye |
Depending on the sequence and the field strength there can be artifacts that look like eye movement and are difficult to separate. To avoid eye movement should the patient not only close the eyes or fix a point, but also with closed eyes think about not to move the eyes.
Other artifacts (e.g. ghosting) can be reduced with fat suppression, reduction of the water fat shift, T1 with a long TE (to reduce the brightness of fat), and/or a higher matrix.
Also the perfect positioning of the coil and a homogeneity correction will improve the image quality. I do not know a post processing program that removes those artifacts.
Regards
Bill
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|  View the whole thread | | |
Emil Cohen
Sat. 19 Mar.05,
01:03
[Reply (3 of 4) to:
'CE MRA of the Liver'
started by: 'bob mitchell'
on Sun. 5 Dec.04]
Category:
Applications and Examinations
|
| CE MRA of the Liver |
The above statements are correct, also remember that the portal vein is brightest in the first pass of contrast through it so having a short sequence for the arterial phase <20 seconds and going straight into the portal phase is important(ie one inspiration/expiration only between repeating the sequence). The portal vein will become brightest within 30 seconds of the artery.
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| | View the whole thread | | |
Pooja Jalikop
Wed. 9 Mar.05,
15:02
[Start of:
'Perfusion analysis'
2 Replies]
Category:
Sequences and Imaging Parameters
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| Perfusion analysis |
Hi,
I am Pooja from Manipal,India. I am doing MS in Medical Software. I'm currently doing a project on Perfusion analysis for stroke calculation. If anyone knows any sites to refer or has any data/material for this topic please let me know.
Regards
Pooja
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salah almahal
Tue. 1 Feb.05,
21:55
[Reply (2 of 6) to:
'Brain Protocol'
started by: 'Oscar Cidri'
on Tue. 7 Sep.04]
Category:
Protocols
|
| Brain Protocol |
hi Oscar,
T2,FLAIR LONG TR and T1-------- TRANSVERSE.
FLAIR ,T1 --------------- SAGITTAL.
DWSSH.
3D ANGIO.
This for routine brain ,although the protocol depend on the clinical diagnosis.
is it for ms,infarction,pitutary abnormalities,orbit abnormalities,ect.....
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| | View the whole thread | | |
Tomas Randell
Thu. 16 Dec.04,
05:03
[Reply (2 of 4) to:
'CE MRA of the Liver'
started by: 'bob mitchell'
on Sun. 5 Dec.04]
Category:
Applications and Examinations
|
| CE MRA of the Liver |
Like lily lily we use a muliphase MRA with 3 phases (artery, portal vein and late phase).
We use an amount of 30 ml Gadolinium with an injection rate of 5 ml/sec. With this high flow rate, you get a more concentrated bolus and therefore a higher contrast for the second phase. We use CENTRA k-space acquisition and reduce the scan time with SENSE (a parallel imaging technique like ASSET ), this will help for a better timing.
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