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| Result: Searchterm 'AIN'
found in 209 messages |
| Result Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 [16] 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 |
More Results:  Database (389) News Service (888) Resources (128) |
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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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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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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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Brent Johnson
Mon. 28 Jan.13,
02:23
[Reply (7 of 10) to:
'ARMRIT in California?'
started by: 'James Benitez'
on Wed. 4 Jan.12]
Category:
Organisations
|
| ARMRIT in California? |
Well I am currently training in ARMRIT at CNI Institute in Orange California. Unfortunately my experience in this school has not been the greatest. I will be starting my externship here in may 2013 I hope the clinic I will be placed in picks me up. I have a plan to goto Texas after school is done. I hope this cert is recognized there or is will be 30k wasted and one large bill to pay for nothing.
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reza beigi
Tue. 4 Dec.12,
08:05
[Reply (6 of 7) to:
'Imaging optic neuritis'
started by: 'Karen Lesley'
on Wed. 18 Jan.12]
Category:
General
|
| Imaging optic neuritis |
dear friend i have a missunderstanding with my radiologist so i want a strong refrence to showing to my radiologist coronal STIR is the best protocol for OPNT.
thanks again
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