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| Result: Searchterm 'HIS'
found in 303 messages |
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More Results:  Database (430) News Service (375) Resources (57) |
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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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Alexey Bobrov
Wed. 5 Jun.13,
14:08
[Start of:
'Help to identify'
1 Reply]
Category:
Equipment
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| Help to identify |
Hi all!
Help me please identify burned element on the photo.
490G 7KV 652505 written on it. What is this and where can I bye it or similar?
This is Siemens Magnetom Trio A Tim System 2008 year
Thanks in avance!
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Reader Mail
Sun. 19 May.13,
05:18
[Start of:
'hearing protection'
0 Reply]
Category:
Safety
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| hearing protection |
Here's the deal: I am an MRI student doing an internship on a GE 1.5T magnet. I mistakenly scanned a person (shoulder, about 15-20 min) without ear plugs or headphones. She complained to me personally and said that she should have had protection. I agreed. I am considering this a huge deal. Am I overreacting? I obviously know that hearing protection is a basic requirement for scanning and that significant damage can occur to the patient. In the heat of the day, I just got distracted and it slipped my mind. Is this an offense that can result in me getting fired?
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Jack Ryan
Tue. 26 Mar.13,
17:54
[Start of:
'Volume Coil info in DICOM Header?'
0 Reply]
Category:
Equipment
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| Volume Coil info in DICOM Header? |
Hello, I need to find out what type of head coil was used for several studies that our lab has run in the past. Essentially I just need to know the number of channels. I've used the dicomread and dicominfo commands in Matlab to no avail, but I've had some luck using syngo (from Siemens) on some of our later studies. I want to check for my sanity that this is possible to do, but if it is not, I'm curious if there are other techniques for finding out this information, rather than just eyeballing the quality of the the scan images. Thanks -Jack
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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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