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| Result: Searchterm 'tr'
found in 421 messages |
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Mel Chang
Thu. 21 Oct.10,
19:26
[Reply (1 of 2) to:
'cervicla axial image t2 and t2*'
started by: 'kim jk'
on Thu. 23 Sep.10]
 Category:
Applications and Examinations
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| cervicla axial image t2 and t2* |
T2* is fine to scan the intervertebral discs. T2 is the better choice to show small spinal cord lesions like MS plaques. The echo time of a T2* sequence may be not long enough to give a good differentiation between the pathology and surrounding tissue.rnDifferent 'Multi Echo Data Image Combination' (MEDIC) techniques have been developed to enhance contrast and pathology detection, if available on the scanner this type of sequence is maybe also a good choice, but due to longer scan times and artifact problems it is best for axial slices.rn
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Travis Conley
Thu. 21 Oct.10,
17:22
[Start of:
'Muscle shading in 3T Images'
2 Replies]
Category:
Applications and Examinations
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| Muscle shading in 3T Images |
We are using a 3T GE scanner to image axial slices of human thigh muscle for the purpose of quantifying muscle volume. rnrnProblem: Our images have been presenting some shading at the top and bottom of each slice. We have tried everything we can think of to get rid of this shading but have not been sucessful. rnrnI have attached a representative image and would love some feel back. rnrnThanks so much for attempting to help us out.
 Thigh Axial Slice
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Jacob Newton
Thu. 7 Oct.10,
19:22
[Reply (1 of 2) to:
'How does TE affect DWI acquisition?'
started by: 'danilo Scelfo'
on Wed. 29 Sep.10]
Category:
Sequences and Imaging Parameters
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| How does TE affect DWI acquisition? |
I never tried to shorten only the echo time while keeping all other parameters the same, but I would expect a change in SNR and artifact appearance. I would use parallel imaging methods to get a shortest possible echo time. Parallel imaging provides DWI with shorter echo trains associated with further reduction of the echo and repetition times, which reduces susceptibility effects and also image blurring. Additionally, the shorter echo time may lead to changes in ADC measurement.
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danilo Scelfo
Wed. 29 Sep.10,
12:15
[Start of:
'How does TE affect DWI acquisition?'
1 Reply]
Category:
Sequences and Imaging Parameters
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| How does TE affect DWI acquisition? |
Hi folk! Just a breath question: how does TE affect conventional sequence (single shot SE-EPI) for DWI acquisition? In particular, how would two acquisitions differ from each other if acquired with TE=90/106ms respectively (being equal all the other parameters, i.e. TR=11s, same FOV, …)? Thanks for any opinion you will give me. Danilo.
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steven china
Fri. 24 Sep.10,
12:12
[Reply (3 of 4) to:
'coil configuration'
started by: 'Zhenghui Zhang'
on Thu. 24 Jun.04]
Category:
Coils
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| coil configuration |
hi buddy
in general,surface coils are designed for receive signals only and have no fuction of transmit
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