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| Result: Searchterm 'tr'
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Matthijs Lipperts
Wed. 7 Jan.09,
11:05
[Start of:
'SPAIR movement artefact'
0 Reply]
 Category:
Artifacts
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| SPAIR movement artefact |
Dear all,
When scanning wrists in our Avanto MR always the penultimate slice in the transversal series shows a movement artefact. This happens with all patients and always the penultimate slice. We found out that using regular fat saturation this does not occur, with SPAIR (which is preferable because of the frequent susceptibility artefacts in arms/wrists) however it happens all the time. The simple solution for our radiology staff is to use normal fat saturation instead of SPAIR, however we are intriged by this problem and were hoping that anyone also experienced this problem and maybe found an explanation.
Because it happens in only 1 slice we are suspecting some kind of interference of the slice selection pulse with the SPAIR pre-pulses.
Any input is appreciated,
thanks in advance, Matthijs
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Sam Shelly
Mon. 10 Nov.08,
14:39
[Start of:
'Best Sequence for Ulnar Collateral Ligament'
1 Reply]
Category:
Sequences and Imaging Parameters
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| Best Sequence for Ulnar Collateral Ligament |
Which sequence best demonstrates the ulnar collateral ligament? T2* Coronal?
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Sam Shelly
Sun. 2 Nov.08,
23:02
[Reply (2 of 3) to:
'Regarding recovery and decay [basic phycisc]'
started by: 'harry sanders'
on Sat. 7 Jun.08]
Category:
Basics and Physics
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| Regarding recovery and decay [basic phycisc] |
Right on.
Recovery and delay are two separate physical processes like the last guy said. It had me stumped for a while when I was studying as well. But read carefully and think hard about it...
T1 recovery is the return of net magnetization into alignment with b0.
T2 decay is a totally different process and is, as the previous person said, simply loss of net magnetization in the transverse plain due to dephasing. The more electrons that are precessing in phase in the transverse plane, the stronger the NMV is in that plane. And, hence forth, when the RF pulse terminates, the influence of b0 gradually dephases the electrons in the transverse plane. As they dephase, the transverse NMV decreases accordingly, until the next pulse hits, rephasing the electrons and starting the process all over.
Hope that helps. MRI physics is hairy and boring at times. Load up on expressos to stay awake and stick with it, because studying MRI physics can be like taking a bottle of sleeping pills.
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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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Patricia Burns
Fri. 24 Oct.08,
19:20
[Reply (3 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 |
The chillers can be off during transport. For short trips, the boil off of cryogens will be minimal.
p.burns
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