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| Result: Searchterm 'Magnet'
found in 87 messages |
| Result Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 [15] 16 17 18 |
More Results:  Database (669) News Service (897) Resources (213) |
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Joshua Murrah
Tue. 1 Apr.08,
04:56
[Reply (1 of 3) to:
'scan question from a layperson'
started by: 'miri leh'
on Wed. 9 Jan.08]
 Category:
Applications and Examinations
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| scan question from a layperson |
The patient has to actually be in the center of the magnet to be scanned. There's no way anyone could actually fit into the magnet in that position.
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|  View the whole thread | | |
Gerald Del Castillo
Mon. 21 Jan.08,
23:39
[Reply (2 of 17) to:
'ARMRIT to ARRT pathway - - - HELP'
started by: 'Gerald Del Castillo'
on Fri. 30 Nov.07]
Category:
Organisations
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| ARMRIT to ARRT pathway - - - HELP |
I currently work with an open magnet. It's by Siemens Magnetom Concerto. The system is an open unit, low field magnet. I have almost 2 years experience as an MRI Technologist, with experience on head & neck imaging, upper and lower extremities, MRA and MRV. I am also CPR and IV certified. In addition, I have 1 month training with the Siemens trio 3T closed unit.
Without the ARRT certification, it has been a challenge. I am willing to show clinics and private facilities what I'm a capable of doing most scans and my dedication to the MRI community, but with only ARMRIT certified tech, it's so rare to get opportunities.
Hope you can help, thanks.
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| | View the whole thread | | |
Reader Mail
Mon. 14 Jan.08,
22:49
[Reply (2 of 4) to:
'Mechanical Ventilator outside of Scan room'
started by: 'Dan Barrieau'
on Wed. 20 Jun.07]
Category:
Site Planning and Specifications
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| Mechanical Ventilator outside of Scan room |
Just to add to that. The rooms are lined with copper mesh so that Radio Frequency (RF) outside the room will not affect the image quality (and vise versa so your monitors won't freak out). The tubes through the wall are long enough to absorb and basically prevent any RF from getting in or out. The place in question probably couldn't justify the money to buy an MR safe vent. And I can't think of any pump that would be safe inside the room; although, some sites will chance taking pumps in and keeping them at a distance from the magnetic field.
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| | View the whole thread | | |
Kathy Dumont
Sun. 6 Jan.08,
20:31
[Reply (2 of 6) to:
'Protection against magnetic exposure'
started by: 'Kathy Dumont'
on Sat. 5 Jan.08]
Category:
Safety
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| Protection against magnetic exposure |
Thank you very much Reader, for you answer very quickly! Sorry, I didn’t express myself very well. No, I don’t want to know about the “Gauss lines” (it’s how we say in France).
In the site of the World Health Organization, they talk about “The International EMF Project”.
I’m searching for informations about the effets of the magnetic fields on the human health. And the laws, if they exist in USA?
In France, there are no limits or laws which say the limits (time limits, job in high fields…) when you work at mri.
We just tell the pregnant not to go in the mri room. That’s all. I think you’re getting ahead France in this domain. For me, mri technology is like radiology’s first times, when Marie Curie discovered that tumor increased while X Ray exposure increased. You know?
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| | View the whole thread | | |
peter hobden
Wed. 14 Feb.07,
15:35
[Reply (1 of 3) to:
'Geometric distortion'
started by: 'ergun ahunbay'
on Tue. 2 Jan.07]
Category:
Artifacts
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| Geometric distortion |
Dear Listers,
I have some questions about the image distortions in MRI:
1) Are the magnetic field inhomogeneities the only cause of image distortions? Does RF-inhomogeneities cause distortions or just signal inaccuracies?
There are other factors that can affect the /amount/ of distortion. Run an EPI sequence and change the bandwidth and see the image change shape.
There are other causes of image distortion which are not necessarily directly related to field homogeneity.
It is a complicated question you are asking here!
2) Is it accurate to say that a spiral sequence would not have distortion due to magnetic field inhomogeneity(, but it would have blurring). Would there be image geometric distortions with a spiral imaging?
I guess you are talking about spiral filling of k-space?? The sampling time reduction will help to reduce distortion to some extent.
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