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| Result: Searchterm 'Noise'
found in 15 messages |
| Result Pages: 1 [2] 3 |
More Results:  Database (86) News Service (14) |
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Niels Janssen
Tue. 6 May.14,
11:24
[Start of:
'GE signa excite 3T - clustered volume acquisition'
0 Reply]
 Category:
Funktional MRI
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| GE signa excite 3T - clustered volume acquisition |
I am wondering if anyone has experience with so called 'clustered volume acquisition' on a GE signa excite 3T. Clustered volume acquisition (or sparse acquisition) means that you acquire images within the first 1000 ms of a 2000 ms TR, for example (Edmister et al., 1999, Human Brain Mapping). This method is useful because the machine will stop producing scanning noise in the final 1000 ms of the TR, which can then be used for recording speech inside the scanner (in fmri applications).
I am asking whether 1) this sequence can be programmed from the parameters menu on the scanner console, or 2) whether it requires compilation of a new pulse sequence.
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Katelin Lyons
Fri. 3 Jun.11,
11:55
[Reply (1 of 2) to:
'Dixon technique'
started by: 'Reader Mail'
on Wed. 1 Jun.11]
Category:
Sequences and Imaging Parameters
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| Dixon technique |
Dixon technique uses alternative water/fat phase-encoding strategies. The technique is generalized to phase encoding of theta radians, and the signal-to-noise ratio (S/N) performance is evaluated.To get some more information regarding this please check out the following link : http://www.ncbi.nlm.nih.gov/pubmed/18777528
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Robert Patten
Thu. 3 Mar.11,
22:08
[Start of:
'Building 3d Volumes from MRI DICOM'
4 Replies]
Category:
General
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| Building 3d Volumes from MRI DICOM |
I have a number of MRI and CTs since a bad accident. I am a Mechanical Engineer with an electrical, power and computer background.
I was able to render the CT to 3D using Onis (not sure if you've seen this program), but have been unable to manage it with any of the MRIs.
The MRIs were taken on a Phillips Intera 1.5T
I can render a volume but only (1) of the (3) 2D images are clear before it is rendered and the resulting 3D image is just noise. I've tried various software packages and spent a lot of time with the software. Perhaps I don't have the required image files.
Maybe someone knows the answer.
Thanks,
Bob
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Sue Wong
Wed. 28 Jan.09,
20:03
[Reply (1 of 2) to:
'Gradient modes'
started by: 'Angela Hoskinson'
on Thu. 22 Jan.09]
Category:
Applications and Examinations
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| Gradient modes |
You pay for the noise reduction; the parameter 'whisper' reduces the gradient performance. Db/dt (and the noise of the scanner is depended on db/dt) is directly proportional to the gradient performance (slew rate).
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Hugo Robalo
Thu. 3 Apr.08,
16:22
[Reply (2 of 4) to:
'MRI Bandwidth and turbo factor relation ?'
started by: 'young bong we'
on Thu. 20 Mar.08]
Category:
Basics and Physics
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| MRI Bandwidth and turbo factor relation ? |
A higher BW will increase the noise, minimum FoV, slices per TR and will decrease the minimum TE, SNR and echo spacing.
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