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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

 
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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Lirong TAN

Thu. 23 Jun.11,
02:44

[Start of:
'fMRI frequency range'
0 Reply]


 
  Category: 
Funktional MRI

 
fMRI frequency range
Hi,

I am trying to decompose the original fMRI time series into several components with different frequency ranges. I use the MODWT wavelet analysis. To obtain the components' frequencies, I need to know the frequency range of the original fMRI signal. Is it 0-1/TR?

Thanks a lot.

Lirong
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Steven Ford

Tue. 7 Jun.11,
18:03

[Reply (2 of 3) to:
'LCD Display Monitors'
started by: 'robert popilock'
on Mon. 23 May.11]


 
  Category: 
Safety

 
LCD Display Monitors
I think that the question is, can you use a display near the magnet, inside the RF shielded room?

The short answer is, No, unless it's specifically marked MR-safe and/or included in equipment that's specificaly designed to be near the magnet, such as an injector.

The problem with using, for example, a monitor from Best Buy is that it will probably emit RF energy that will corrupt the very weak MRI signal recieved from the patient's body. Of course, there is also the question of anchoring the monitor to prevent it from being attracted into the magnet.

In general, an off the shelf monitor will not be affected by the magnet.

You can buy special RF shielded monitors, or enclosures.

If you were thinking about adding a patient DVD viewing capability, there are several other concerns to keep in mind. The signal feeding the monitor must be filtered where it enters the RF shield.
 
 

Steven Ford
Professional Imaging Services, Inc.
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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

 
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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Reader Mail

Wed. 1 Jun.11,
14:14

[Start of:
'Dixon technique'
1 Reply]


 
  Category: 
Sequences and Imaging Parameters

 
Dixon technique
I have been searching the web for information regarding a "double-echo two-excitation pulse sequence encoding fat and water signals for a phase-sensitive three-point Dixon type analysis". Does anyone know what pulse sequence(s) this is referring to, or a publication that might be helpful???
Thanks
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