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| Result: Searchterm 'Noise'
found in 14 messages |
| Result Pages: [1] 2 3 |
More Results:  Database (86) News Service (14) |
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Reader Mail
Fri. 17 Feb.12,
20:25
[Start of:
'MRI Noise'
0 Reply]
 Category:
General
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| MRI Noise |
How many effective the noise of mri machine on auditary canal? rn
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Donna Ponticello
Sat. 13 Aug.05,
16:29
[Start of:
'Protection Against Noise'
4 Replies]
Category:
Patient Care and Comfort
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| Protection Against Noise |
In the future, we will scan also newborn children at our 3T machine. I see a problem in the loudness of the MRI system because I know that babies are more sensitive to noise. Adults get earplugs and headphones and there is no problem. The headphones will not fit and I am worried about the noise pollution. Has anybody a good idea?
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Renate S.
Sat. 6 Jun.15,
13:18
[Reply (1 of 2) to:
'is this kind of zebra artifact?'
started by: 'luna xu'
on Fri. 5 Jun.15]
Category:
Artifacts
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| is this kind of zebra artifact? |
Looks more like a Zipper artifact. Can be caused by electronic noise. Switch off all light bulbs, remove all electronic equipment from the scanner room, make sure that the door is really closed (clean the contacts between door and jam if necessary) and try again. If the artifact consists control the penetration panel where the cables enter the room and the faraday cage, it is possible that there is a leak in the RF shield. If the artifact remains with all coils and sequences you need the service to repair the problem.
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Rena Miller
Fri. 15 Aug.14,
07:16
[Reply (1 of 2) to:
'door alarm/ MRI pauses if door opens'
started by: 'Samuel Strode'
on Thu. 7 Aug.14]
Category:
Devices, Scanner, Machines
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| door alarm/ MRI pauses if door opens |
MRIs are enclosed by a Faraday cage to shield the MRI scanner against incoming radio waves which would disturb the sent and received signals. The reception or transmission of radio waves is heavily attenuated or blocked by the cage, which is usually integrated in the walls of the scanning room. The closed RF door completes the cage preventing RFI/EMI leakage, absorbs also much of the acoustic noise and prevents unauthorized persons to enter the room. Usually, all or the unreconstructed part of information is lost if the scan is stopped by door opening. Some MRI systems allow to pause the scan (at the keyboard, not by door opening) and to continue scanning while not loosing data.
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Niels Janssen
Tue. 6 May.14,
11:24
[Start of:
'GE signa excite 3T - clustered volume acquisition'
0 Reply]
Category:
Funktional MRI
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| GE signa excite 3T - clustered volume acquisition |
I am wondering if anyone has experience with so called 'clustered volume acquisition' on a GE signa excite 3T. Clustered volume acquisition (or sparse acquisition) means that you acquire images within the first 1000 ms of a 2000 ms TR, for example (Edmister et al., 1999, Human Brain Mapping). This method is useful because the machine will stop producing scanning noise in the final 1000 ms of the TR, which can then be used for recording speech inside the scanner (in fmri applications).
I am asking whether 1) this sequence can be programmed from the parameters menu on the scanner console, or 2) whether it requires compilation of a new pulse sequence.
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