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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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michelle cyrus
Wed. 24 Sep.14,
16:43
[Start of:
'[URGENT] Need MO disk 2.3GB of Hitachi MRI AIRIS MATE'
0 Reply]
 Category:
General
|
| [URGENT] Need MO disk 2.3GB of Hitachi MRI AIRIS MATE |
We are urgently looking for Maxell magneto optical disk 2.3GB 512byte/sector rewriteable MA172-S1.
The disk contains AIRIS MATE (ultraSPARC- IIi) system software.
Ship to: Vietnam
Please email us to singaporemedical@outlook.com or call +84912460068 if you have one.
Thanks a lot.
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Steven Ford
Tue. 5 Aug.14,
20:01
[Reply (1 of 2) to:
'?'
started by: 'Belinda Williams'
on Mon. 21 Jul.14]
Category:
Coils
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| ? |
Belinda,
It would be helpful if you would add a photo, even if you take a cellphone photo of your screen and blot out the name.
You did not say, but is this a new problem?
In general, if one orientation looks worse than others, you may have a magnet shim problem; you can crudely test this yourself by using a cylinder type phantom and doing an identical scan in three planes. A shim problem would affect T2's more than T1 or PD images also.
There is always a possibility that your sequences have changed without you realizing it too; check this even if you don't know how that would have happened.
Steven Ford
Professional Imaging Services, Inc.
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Barry Ng
Wed. 10 Jul.13,
17:10
[Start of:
'Titanium & MRI Safety'
2 Replies]
Category:
Safety
|
| 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
|
| 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
|
| 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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