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| Result: Searchterm 'tr'
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Jorge Cazal
Mon. 13 Jun.05,
17:06
[Start of:
'Metalic particles into the cornea'
2 Replies]
 Category:
Safety
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| 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
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| 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
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| 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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William Flemming
Tue. 29 Mar.05,
02:49
[Reply (1 of 2) to:
'MR image of an eye'
started by: 'Reader Mail '
on Tue. 14 Dec.04]
Category:
Applications and Examinations
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| MR image of an eye |
Depending on the sequence and the field strength there can be artifacts that look like eye movement and are difficult to separate. To avoid eye movement should the patient not only close the eyes or fix a point, but also with closed eyes think about not to move the eyes.
Other artifacts (e.g. ghosting) can be reduced with fat suppression, reduction of the water fat shift, T1 with a long TE (to reduce the brightness of fat), and/or a higher matrix.
Also the perfect positioning of the coil and a homogeneity correction will improve the image quality. I do not know a post processing program that removes those artifacts.
Regards
Bill
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