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| Result: Searchterm 'HIS'
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meike carr
Mon. 23 Oct.17,
15:41
[Reply (2 of 3) to:
'GE 8 channel Body Coil Artifact'
started by: 'Arnold Somereville'
on Sun. 23 Apr.17]
 Category:
Artifacts
|
| GE 8 channel Body Coil Artifact |
It is hard to see the exact artifact in this picture. It almost looks like wrap to me, but again hard to determine with pic provided. What else has been done to fix this issue? Have you changed the frequency direction or opened up your FOV?
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Brian Simpson
Tue. 26 Sep.17,
16:09
[Start of:
'Question on an image'
0 Reply]
Category:
General
|
| Question on an image |
HirnrnI'm new here and I am not looking for someone to read my MRI, just an opinion. I had a thoracic MRI done and the results came back as normal wear and tear. Is it possible for the radiologist to miss something if he isn't looking for a specific item?rnI am seeing my Dr. tomorrow and don't want to show him the attached if it isn't anything to be worried about. I didn't find this until I used the invert feature on the viewer. Should I be concerned?rnThank you.rn
 capture 5
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Antonio Dominin
Mon. 14 Aug.17,
00:03
[Start of:
'MRI Safety w VNS Lead Still In Body'
0 Reply]
Category:
Safety
|
| MRI Safety w VNS Lead Still In Body |
Hello Everyone!rn:-)rnrnPlease forgive me in advance for making any newbie mistakes here. I am new and appreciate your kind correction of any errors that I might make.rnrnI am a patient with many, many illnesses. In 2006, I was in the deepest depths of depression and could not see any other way to treat it, other than the newly approved (then) Vagus Nerve Stimulator (VNS) for depression.rnrnNeedless to say, it did not help at all and, after over 2 years of VNS therapy, my doctor and I agreed to turn it off. (It makes the neck muscles move when it is stimulating the vagus nerve, which can get annoying after a while.)rnrnWhen I got the VNS implanted, I was told that I would never be able to have an MRI done, except with special equipment, called a transmit & receive coil. This wasn't a problem because my hospital, Olympia Medical Center, here in Los Angeles, had one of these.rnrnHowever when they upgraded their equipment in the years following my implant, they no longer had a transmit & receive coil for the new machine, and I could not find any place in LA that did have this coil.rnrnNow, since I have so many illnesses in my life, the possibility that I will need an MRI in the future is great. Therefore, I called and spoke with the assistant of the Neurosurgeon at USC Keck Medical Center that implants VNS, and he could therefore remove the VNS.rnrnHowever, the assistant said that, while he could remove the VNS device itself, he would probably have to leave the lead to the vagus nerve in the body because of it's attachment to the nerve has probably grown in at this point.rnrnMy question is this: Will I be able to safely have MRIs in the future with this lead still in my body? At this point, I am thinking that I might have to have MRIs of my brain (Parkinson’s disease, exotropia), wrist (Carpal Tunnel Syndrome), C-spine (prior to doing occipital nerve blocks). Do you have any other comments or suggestions on my situation?rnrnThank you very much for your kindest consideration of my post. I look forward to hearing back from you, and I will await your replies. rnrnBest regards,rnrn~Antonio Dominionrn:-)
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LAURA STETSON
Sun. 16 Jul.17,
13:35
[Reply (3 of 4) to:
'2013 registry'
started by: 'Reader Mail'
on Thu. 19 Sep.13]
Category:
Basics and Physics
|
| 2013 registry |
Hi, I know this thread is old but I'm looking for anyone that might have MIC MRI Registry review book?? Please contact me stets79@gmail.com
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Math G
Fri. 30 Jun.17,
21:02
[Reply (10 of 12) to:
'90 excitation pulse vs 180 inversion pulse'
started by: 'Bjorn Redfors'
on Sat. 27 Jun.09]
Category:
Basics and Physics
|
| 90 excitation pulse vs 180 inversion pulse |
I will try an answer to this rather old tread, in case someone stumble upon this like me.
The phenomenon of "coherence" that produce transverse magnetization after a 90 RF pulse cannot be answered by classical mechanics, or any simple model that represents individual protons as precessing magnets in either the parallel/antiparallel direction with regards to the MRI magnetic field.
Rather, it is a phenomenon related to quantum mechanics and the effect of a RF field on a interacting group of particles with spins (not necessarily oriented as parallel/antiparallel, I might add, even under the effect of a magnetic field).
The simplest depiction, as I understand, would be to imagine a group of spins as literally rotating as a whole under the effect of the RF. After a certain time (corresponding to a 90 degree pulse), the net magnetization that was oriented parallel to the MRI magnetic field, is now oriented in the transverse plane, causing transverse magnetization and signal. If you further apply RF, the system will continue to rotate, shifting gradually toward an antiparralel orientation, losing transverse magnetization in the process.
Hope its clearer!
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