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MRI Forum
'Implants'
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Result: Searchterm 'Implants' found in 5 messages
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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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William Richardson

Tue. 20 Jun.17,
12:33

[Start of:
'MRI 1w/kg sequences Siemens Avanto FIT'
0 Reply]


 
  Category: 
Sequences and Imaging Parameters

 
MRI 1w/kg sequences Siemens Avanto FIT
I have recently been asked to build protocols for Spines and extremities that are 1 watt per kilogram SAR. In speaking with Applications at Siemens they inform me that I can only change certian parameters to help lower SAR but it will all be dependent upon each patient and which sequences are running. I need to present to our MRI QA commitiee if we can or if we cannot do 1w/kg SAR as we are determining if we can scan cochlear implants? Does anyone have any ideas or solutions?
 
 

Thank You
Will R.
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Jon Selby

Tue. 26 Apr.16,
07:57

[Start of:
'Susceptibility artifact query'
0 Reply]


 
  Category: 
General

 
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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Charlie McIntyre

Tue. 17 Apr.12,
16:28

[Start of:
'High Field Open MRI systems/Spatial Gradient limits'
0 Reply]


 
  Category: 
Safety

 
High Field Open MRI systems/Spatial Gradient limits
Anyone out there operating a Philips HFO or Hitachi Oasis? If so how is your facility handling the new FDA labeling of MR "conditional" limits of certain implants(stents, shunts, etc..) and the Higher Spatial Gradient Forces that these machines have? thanks.
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Angel Lara

Thu. 5 Jan.06,
18:03

[Start of:
'siemens impact expert'
2 Replies]


 
  Category: 
Sequences and Imaging Parameters

 
siemens impact expert
Does anyone remember how to shim for silicon on numaris?

I am having trouble with breast implants, I do not know how to adjust center frequency for proper shimming of water and silicon.

Some images look like saline and some look like silicon.

Old machine and do not have accsess to applications. Any help will be greatly appreciated.
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