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| Result: Searchterm 'Power'
found in 18 messages |
| Result Pages: 1 2 [3] 4 |
More Results:  Database (102) News Service (80) Resources (12) |
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Piotr Wdowiak
Mon. 27 Oct.08,
17:12
[Reply (4 of 5) to:
'Mobile MRI - Keeping Magnet Cold'
started by: 'Will B'
on Thu. 23 Oct.08]
 Category:
Devices, Scanner, Machines
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| Mobile MRI - Keeping Magnet Cold |
Hi
Majority of mobile MRI scanners got onboard generators.
Once you plug off scanner from main external pawer onboard generator will start automaticly.
It keeps chiler running during the transport.
Onboard generator alows you switch on the system , but I wouldn't scan using onboard generator. This is just to keep running system when power supply failure.
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|  View the whole thread | | |
Will B
Fri. 24 Oct.08,
18:07
[Reply (2 of 5) to:
'Mobile MRI - Keeping Magnet Cold'
started by: 'Will B'
on Thu. 23 Oct.08]
Category:
Devices, Scanner, Machines
|
| Mobile MRI - Keeping Magnet Cold |
Thanks for the reply! Very interesting. So after the ramp off, and the vehicle is in motion, do you have to continue to keep the chiller powered? Or does the ramp off alleviate that need?
Thanks again,
Will
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| | View the whole thread | | |
Patricia Burns
Fri. 24 Oct.08,
13:17
[Reply (1 of 5) to:
'Mobile MRI - Keeping Magnet Cold'
started by: 'Will B'
on Thu. 23 Oct.08]
Category:
Devices, Scanner, Machines
|
| Mobile MRI - Keeping Magnet Cold |
Will,
When a mobile MRI Scanner is in motion going from site to site a "ramp down" is performed before moving.This is when the magnetic field is lowered but not completely shut off. The field still keeps it's integrity due to the Cryogens that surround it. When it comes to the new site, a "ramp up" is performed to bring the magnetic strength back up to par. Bottom line...The Cryogens are not boiled off and keep the magnet cold when it is motion. If the magnet were to suddenly lose it's power, it could be due to a cryogen boil off.
p.burns
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| | View the whole thread | | |
Rud Spring
Fri. 7 Apr.06,
21:08
[Reply (1 of 2) to:
'SAR, Magnetic field and exitation frequency'
started by: 'I L'
on Wed. 12 Oct.05]
Category:
Basics and Physics
|
| SAR, Magnetic field and exitation frequency |
At two times the field-strength you need four times more RF power. (If you keep the duration of the pulse the same...)
But the exact amount of RF power depends on many more system components. Usually 3T transmit coils are shorter compared to 1.5T, such that less than four times the RF power is needed...
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| | View the whole thread | | |
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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