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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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Sai Mahathi Yasa
Sun. 29 Mar.15,
04:58
[Start of:
'Re: Calculation of Resolution and Tr'
0 Reply]
 Category:
Basics and Physics
|
| Re: Calculation of Resolution and Tr |
Tacq= 32s
Gradient strength= 10mT/m
Matrix size=256x256 pixels
dwell time= 0.03ms
How to calculate resolution and Tr?
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Steven Ford
Tue. 5 Aug.14,
19:57
[Reply (3 of 4) to:
'MRI artifact'
started by: 'Daniel Cronk'
on Mon. 16 Jun.14]
Category:
Artifacts
|
| MRI artifact |
No it is not an RF leak artifact. That would appear different. I would guess that there was one instance of motion. Note that the artifact is mostly on the high contrast areas (white against black) where the patient can move the most.
Also it may be that your acquisition matrix was a little on the low side, which would lead to larger pixel-y appearance that is more apparent when there's motion.
Steven Ford
Professional Imaging Services, Inc.
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Steven Ford
Thu. 17 Mar.11,
03:16
[Reply (2 of 5) to:
'Building 3d Volumes from MRI DICOM'
started by: 'Robert Patten'
on Thu. 3 Mar.11]
Category:
General
|
| Building 3d Volumes from MRI DICOM |
In almost all cases, MRI images have a slice thickness far greater than their in-plane resolution, making multiplanar reconstruction meaningless. Also, most MRI images have a gap between the slices, which also renders multiplanar meaningless and impossible (unless you're happy with black bars where the slice gaps exist).
You can look at your images and the slice thickness is on the graphics. the slice gap is usually not displayed, but if you look at the slice location displayed on adjacent slices, and compare to the slice thickness, you can easily compute the slice gap.
The in-place resolution is (approx) the field of view divided by the acquisition matrix, both of which are also printed on the image somewhere.
By the way, if you have the dicom (.dcm) files, there is lots of data that's 'hidden' that you can access with a full featured dicom file editor.
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David Brooks
Tue. 22 Dec.09,
02:35
[Start of:
'Scan equation I don't get, HELP'
2 Replies]
Category:
Basics and Physics
|
| Scan equation I don't get, HELP |
Here's the question:
The approximate scan time of a rapid spin echo sequence with a TR of 3500ms, a TE of 90ms, a 256x256 matrix, 1 exicitation, a 220mm FOV and an echo train length of 5 is______ minutes.
Formal they give is 3500msx1x256/5=?
a.3
b. 8
c. 11
d. 15
I get 179200. What am I missing in my studies and the math?
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Gonzalo Sanchez Benavides
Tue. 5 Jun.07,
07:53
[Start of:
'DTI 25 directions on GE signa excite 1.5'
4 Replies]
Category:
Sequences and Imaging Parameters
|
| DTI 25 directions on GE signa excite 1.5 |
Hello,
I need some help with the DTI 25 gradient directions on GE signa excite.
I'm a neuropsychology researcher and i receive some data with this protocol, but the technician cannot tell me the matrix that i need to process it. It's somthing like this:
26
0 0 0
1 0 1
...
If anybody can help me i would be very grateful.
Thanks
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