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Glad Mihai
Mon. 26 Sep.11,
11:53
[Start of:
'Siemens CINE Sequence details'
0 Reply]
 Category:
Sequences and Imaging Parameters
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| Siemens CINE Sequence details |
Hello there fellow NMR enthusiasts, I have a question regarding the CINE-Sequence that a Siemens 3 T scanner does, in particular I am interested in the retro iPAT sequence. What I want to know is what the exact parameters are.
For example, I have set a TR of 2.7 ms, but the actual recording time of one scan is close to 300 ms. Why is that? What else gets added to this time?
If anyone has links to useful information about sequences, then I am more than happy to check them out.
Regards, Glad
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David Pierce
Thu. 22 Sep.11,
17:53
[Start of:
'MRI Magnet Room Cameras?'
6 Replies]
Category:
Equipment
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| MRI Magnet Room Cameras? |
Hello All,
new to the forums and such. Anyhow, some of my fellow techs and friends in the business have been talking about these cameras that go in the magnet room of an MRI. Does anyone have any opinions here? I like to look at things from as many angles as I can before I take it up with the bean counters and the heads of my center.
Thanks!
Hawk
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Raymond Chang
Thu. 15 Sep.11,
18:03
[Start of:
'SEMS vs. STEMS'
0 Reply]
Category:
Sequences and Imaging Parameters
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| SEMS vs. STEMS |
I have a quick question about a pulse sequence. What is the difference between a conventional SEMS vs STEMS?
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Rudolfo Marques
Fri. 19 Aug.11,
12:03
[Start of:
'fmri, block design: length of "On" and "Off" periodes ?'
0 Reply]
Category:
Funktional MRI
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| fmri, block design: length of "On" and "Off" periodes ? |
Hello,
I'm planning some fmri research and I wonder why often the blocks of stimulation and nothing (or called base level or resting state) have the same length
If I let -maybe- a flickering checkerboard about 16 seconds on, as my "ON" period... then I should not need further 16 seconds resting state? DO I?
The BOLD-related effects should be away after about 2 seconds?
Thanks
Rudolfo
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Reader Mail
Tue. 26 Jul.11,
14:05
[Start of:
'MR750: ASSET Artifact or 32 Channel coil?'
1 Reply]
Category:
Funktional MRI
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| MR750: ASSET Artifact or 32 Channel coil? |
Hi,
We are performing fMRI on a GE MR750 Discovery.
As you can see we get artifacts when performing DTI and fMRI.
It looks like herringbones or spikes artifacts. But it appears only at the very top slices where there is generally no more brain.
One possible explanation is that ASSET will produce the artifact where there is no signal.
Another explanation would be that some element of the 32 channel coil is going mad.
Has anybody experienced the same artifact?
Thank you.
 DTI artifact
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