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| Result: Searchterm 'MRI'
found in 415 messages |
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More Results:  Database (561) News Service (1300) Resources (333) |
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Barry Ng
Wed. 10 Jul.13,
17:10
[Start of:
'Titanium & MRI Safety'
2 Replies]
 Category:
Safety
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| Titanium & MRI Safety |
I am trying to understand why titanium is considered "MRI Safe".
I see three potential problems when considering the MRI safety of a material:
1 - If it is a ferromagnetic material extreme damaging forces will be applied to the material if exposed to a very strong magnetic field. Titanium is not a magnetic material so I do not see this as a problem.
2 - When a relatively large flat conductor (e.g. a titanium plate) is exposed to a changing magnetic field (Faraday's law) eddy currents will be created internally as the result of induced voltages. These eddy currents can be very high and cause resistive heating ("I squared R losses"). I would think these eddy currents would have the potential to cause extreme heating of the titanium. I know from experience this does occur with steel and titanium has a conductivity about the same as steel. Titanium is not magnetic as is steel but induced voltages due not require a ferromagnetic material (.e.g. copper as used in real world generators, etc.).
3 - Induced voltages are created across the length of a conductor as the result of the conductor being exposed to a changing magnetic field ("genrator effect" - Faraday's Law). Again this effect does not require a magnetic material. So why, at best, does this effect not have the potential to be uncomfortable or even very painful to the MRI patient being exposed to a huge changing magnetic field?
Invariably the response to why titanium is safe focuses on the fact that it is not magnetic. I get the deer in the headlight look when I ask about eddy current heating and induced voltages.
Please help me understand why unduced eddy current heating and induce voltages are not a concern.
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twid twid
Mon. 10 Jun.13,
18:07
[Start of:
'BUild MRI machine'
0 Reply]
Category:
Devices, Scanner, Machines
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| BUild MRI machine |
is it possible to get mri hardware without computation hardware and software for image reconstruction?
I means, I want to by only hardware to get data from sensor and i have computation unit and software for image reconstruction...
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Daria Panek
Mon. 4 Mar.13,
12:58
[Start of:
'fMRI of Pituitary'
0 Reply]
Category:
Applications and Examinations
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| fMRI of Pituitary |
Hello,
I have started project with examination of various structures in the brain on the data from fMRI. I wanted to check the behaviour of Pituitary on my data coming from fMRI. Have anyone heard of any other similar examination of Pituitary on images coming from fMRI? I could not find any paper about it.
If you can help me, I will be extremly grateful.
Thanks,
Daria
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Gopal Agarwal
Sat. 23 Feb.13,
02:54
[Start of:
'Looking to buy MRI...Siemens Essenza OR GE HDxT ??'
0 Reply]
Category:
Devices, Scanner, Machines
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| Looking to buy MRI...Siemens Essenza OR GE HDxT ?? |
Hi Folks,
I own a medical center in India and planning to buy a MRI machine. With my budget of INR 35M (USD 700K) I can either get a NEW 16 channel Siemens Essenza or USED gold seal 16-channel GE HDxT.
Can anyone please suggest which one to buy. Essenza looks good as footprint is small and power consumption is low, but FOV is small. Any help will be appreciated.
-Gopal
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Luuk van Smoorenburg
Mon. 11 Feb.13,
16:49
[Start of:
'Help! Question about MRI and Pregnancy'
0 Reply]
Category:
General
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| Help! Question about MRI and Pregnancy |
Dear Users of MR-TIP.com,
I'm a student at the University of Applied Science in Haarlem, The Netherlands. Currently I am in my bacherlor year and doing my thesis about MRI and the (possibly) pregnant worker. My question is does anyone know a good site, database or some literature about this subject. For my thesis i'm gathering information about the different policies the Dutch hospitals are currently using when one of their radiographers is pregnant.
I hope by submitting this thread, I will get response on more usefull literature and even practical information about policies within the hospital/private clinic envirorment,
Any suggestions/help is appreciated,
Excuse me for my bad English,
Kind regards,
Luuk van Smoorenburg
ps; you can e-mail me if you have some relevant information!
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