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| Result: Searchterm 'tr'
found in 421 messages |
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Eduardo Mendes
Tue. 19 Jul.16,
12:59
[Start of:
'Need to quench a scanner now'
2 Replies]
 Category:
General
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| Need to quench a scanner now |
HellornrnI have on old Oxford 4.7 T scanner that has been working since 2011. Unfortunately these last few days we could not transfer He in. Although our He liquefier is completely full and the transfer line is connect to the magnet, no He is transferred. The transfer line has been made vacuo efficient two months ago and should be ok. rnrnIt seems that we need to quench the magnet. We don't have any external power supply to connect to the magnet and retrieve the current. rnrnWhat can we do? Is there any safety measures? Can we leave the magnet as it is? Should we evacuate the building? Should we isolate the area? rnrnThank you ever so much for your time and help. rnrnI have contacted Oxford several times but they didn't return my emails. rnrnMany thanksrnrnEdrnrn
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James Shingola
Fri. 15 Jul.16,
19:22
[Start of:
'What does this mri report mean'
0 Reply]
Category:
General
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| What does this mri report mean |
Small developing vertical cleft along the radial side of the membranous TFC disc fibers, best seen on image 11 series 5. There is no evidence of contrast transit into the distal radioulnar joint. The remainder of the TFC disc is intact and grossly unremarkable.
Intact intrinsic ligaments. There is no widening of the intervals. There is no contrast in the midcarpal compartment.
Increased interstitial signal within the ECU tendon is likely due to tendinopathy and a developing longitudinal split. The remaining tendons are grossly unremarkable.
Normal caliber median and ulnar nerves.
Minimal generalized wrist osteoarthrosis with minimal to mild chondromalacia, small intraosseous cysts and minimal osteophytosis.
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Renate S.
Thu. 5 May.16,
14:27
[Reply (1 of 2) to:
'Contrast on an 3T'
started by: 'Roos van Wieringen'
on Mon. 2 May.16]
Category:
General
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| Contrast on an 3T |
Studies (for example http://pubs.rsna.org/doi/full/10.1148/radiol.2373041672 , http://pubs.rsna.org/doi/full/10.1148/rg.287075154 ) suggest that contrast enhancement of gadolinium is increased at higher field strengths. That can be used to lower the dose or receive higher contrast effects. It also depends on the contrast sensitivity of the used sequences and the examined body part.
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Jon Selby
Tue. 26 Apr.16,
07:57
[Start of:
'Susceptibility artifact query'
0 Reply]
Category:
General
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| Susceptibility artifact query |
As an MRI 'newbie' would someone be willing to help me with a question on magnetic susceptibility. If you have two metal implants of the same external geometrical form but one of these is hollow, would you you get the same size artifact? I'm basically wondering whether a metallic implant has a finite sphere of influence or whether it is compounded by the volume of material. Much appreciated, Jon
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John Smith
Wed. 11 Nov.15,
22:14
[Start of:
'Faster pulse sequences'
0 Reply]
Category:
General
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| Faster pulse sequences |
Hi,
I have been learning about faster MRI sequences and have two questions
1) With "Fast (Turbo) gradient echo", in which we apply a spoiler gradient, do we not eventually end up with no longitudinal magnetization because TR is always shorter than T1? Hence shouldn't we eventually get no signal at all?
2) in SSFP (Steady-state free precession) we can apply an RF pulse of 90 degrees (in which T1>>T2) to get heart-blood contrast. How is this any different to a standard spin-echo sequence in terms of timing?
Thank you
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