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| Result: Searchterm 'tr'
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Tomas Randell
Mon. 20 Jun.05,
19:38
[Reply (1 of 3) to:
'Metalic particles into the cornea'
started by: 'Jorge Cazal'
on Mon. 13 Jun.05]
 Category:
Safety
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| Metalic particles into the cornea |
For my personal opinion, it is not to expect that these microscopic steel particles are a contraindication for an MRI of the head. An injury of the patient by dislocation or
torque presents not a real risk because of the small size.
The possibility of heating is minimal and can be additional lowered by reducing the SAR. Artifacts may reduce the image quality a little, but diagnostic brain imaging is certainly possible. The use of a mid or low field MRI machine will also reduce any risks.
Hope this will help.
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Jorge Cazal
Mon. 13 Jun.05,
17:06
[Start of:
'Metalic particles into the cornea'
2 Replies]
Category:
Safety
|
| Metalic particles into the cornea |
Dear Friends:
We are working in a Ophthalmology Department at Institut Universitari Dexeus-USP in Barcelona.
We received a patient who was treated for myopia some time ago using a LASIK technique ( Laser In situ Keratomileusis) as you probably know, cornea was sliced and lasered using a microkeratome however blade oscilation in the past eventually spread into the interface particles comming from steel inox blade´s.
Could this affect an MRI of Head, is this a contraindications, ( particles are microscopic/multiple and are interlamellar into cornea )
Thank you for your input
Kind Regards
Jorge Cazal;MD
Cornea & Refractive Surgery Unit
Institut Universitari Dexeus-Barcelona
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Chris Gardener
Wed. 11 May.05,
22:43
[Reply (1 of 2) to:
'Radio frequency exposure'
started by: 'Reader Mail '
on Tue. 3 May.05]
Category:
Basics and Physics
|
| Radio frequency exposure |
If the magnetic field strength (measured in Tesla/Gauss) increases, also the SAR increases. For fields up to 3.0 Tesla, the value of SAR is proportional to the square of the field but at high fields the body becomes increasingly conductive, with the need of increased RF power. The EMF exposure is reduced by the square of the distance.
Hope this will help
Chris
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Sue Johanson
Wed. 27 Apr.05,
03:36
[Reply (1 of 4) to:
'Contrast MRA COW.'
started by: 'Marilia White'
on Thu. 3 Mar.05]
Category:
Contrast Agents
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| Contrast MRA COW. |
Hi,
seems crazy, you should have many undesirable veins! We run a 3D TOF MRA of the circle of willis without contrast with best results (1.5T and 3T).
Contrast enhanced 3D MRA of the carotids are done with machine injection (never with a butterfly!), automated bolus detection and a flow of 3ml/sec and 25 ml Gad. If no bolus detection program is available, look for the delay with a test bolus of 2ml. With a high resolution scan, both carotids and circle of willis are assessable. The use of a set like Smartset for the injection is helpful if no power injector is available.
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tina muthana
Thu. 14 Apr.05,
22:44
[Start of:
'diffusion MRi'
1 Reply]
Category:
Basics and Physics
|
| diffusion MRi |
Hi
My name is Tina and I am currently studying Diffusion weighted MRI. I was wondering if anyone could elaborate on the effect of introducing a slice selection gradient along with the diffusion gradient on the signal attenuation. Also if there are any sites that could explain it, I would appreciate the information.
Thank you.
-TIna
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