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| Result: Searchterm 'Matrix'
found in 12 messages |
| Result Pages: 1 [2] 3 |
More Results:  Database (82) News Service (2) Resources (3) |
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Johan J
Thu. 8 Feb.07,
20:48
[Reply (2 of 3) to:
'scan matrices and steps'
started by: 'Steven Smith'
on Wed. 20 Dec.06]
 Category:
General
|
| scan matrices and steps |
It means that the matrix is variable, so you can choose to have 256, 260, 264 etc matrixes. This is than again part of how advanced the fourier transformation algorithm is.
Cheers
BTW Matrixes are just a number, and actually say nothing at all regarding resolution...yess FOV devided by matrix gives you a pixel size which is actually the interesting part.
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Steven Smith
Wed. 20 Dec.06,
22:46
[Start of:
'scan matrices and steps'
2 Replies]
Category:
General
|
| scan matrices and steps |
Hello,
I've just joined this forum because I'm a Japanese-English translator and often translate MRI related material, but my knowledge is a bit patchy. I have a rather basic question. Part of a product specification goes (translated):
Scan Matrix: 64 – 1024 x 64 – 1024; 4 steps per
I assume this is 4 steps per scan, but wanted to check just in case. Also could anyone explain what is meant by steps in this context?
Thanks very much
Steven Smith
www.fwtranslations.co.uk
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Jennifer Jackson
Fri. 21 Jul.06,
04:44
[Reply (1 of 2) to:
'Phase encoding'
started by: 'guillaume bierry'
on Fri. 7 Jul.06]
Category:
General
|
| Phase encoding |
Wow this is a long subject, First you have to under stand how the 3 main gradients are used. (slice select, Freq, then phase)
So you are use 1 of the gradients for your phase encoding. You need to fill the k-space which depends on you matrix. Lets assume you are using 256 (phase). In order to fill K-space you have to have 256 aquistions of the signal. Meaning for each picture (or slice) the signal must be acquire(sampled) 256 times each at a differnt amplitude to put it in a different Line of k-space.
Example- If you are performing a SE(spin echo) you have 1 TR period and 1 TE period (TE=is when the signal is sampled) so you will have to do the TR period 256 times to fill K-space with diffent amplitudes.
There is alot more that I left out. If this did not answer your question let me know
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Bear DuDu
Sun. 4 Jun.06,
09:30
[Reply (1 of 3) to:
'ZIP512'
started by: 'Shaun Schofield'
on Thu. 30 Mar.06]
Category:
Sequences and Imaging Parameters
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| ZIP512 |
when you use low matrix (lower than 256x256), you may use zip512 to increase the display resolution of image.
if the matrix is larger than 256x256, the system automatically use zip512.
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Shaun Schofield
Thu. 30 Mar.06,
04:04
[Start of:
'ZIP512'
2 Replies]
Category:
Sequences and Imaging Parameters
|
| ZIP512 |
What are the optimum parameters when using ZIP512 (ie; even nex? square matrix?)
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