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Kimberly Wilridge

Fri. 26 Jul.13,
16:38

[Reply (1 of 2) to:
'Help to identify'
started by: 'Alexey Bobrov'
on Wed. 5 Jun.13]


 
  Category: 
Equipment

 
Help to identify
It looks like it may be be a capacitor or some kind. Siemens uses a lot of internal parts that don't match or compare to GE or Philips and most of their caps are there's and you might want to try looking in: alibaba for china/japan makers. If you can remove the other one and attach it to a capacitor reader or bench analyzer might help also. A digital multimeter would rule out resistor or diode.
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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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twid twid

Mon. 10 Jun.13,
18:07

[Start of:
'BUild MRI machine'
0 Reply]


 
  Category: 
Devices, Scanner, Machines

 
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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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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