My custom made MRI coil has short tuning and matching sticks, so I need to put my hand in the magnet to tune and match. Whenever I remove my hand, the signal shifts. so I need to re-tuning and matching. Where can I buy those?
Your hand is adding capacitance to the circuit by it's proximity to either the cable attaching the coil to the magnet or by a distortion of the capacitor that you are tuning by the force on the tuning stick.
Leaving that aside just tape a plastic rod to the tuning rods and see if doing that solve your probe. If it does then your problem is the effect of cable capacitance. You can have your shop fabricate longer tuning sticks. If it does not solve the problem then its mechanical distortion and your MRI coil may need repair.
Good luck with your experiment.
Thank you for your answer, Dr. Morris.
I already tried it and it worked. So I wanted to buy longer tuning sticks which is 1/7" diameter. I found one (1/8") from amazon this morning and ordered it. :-)
Hope it works!
Thank you again. Have a wonderful weekend!
Hi Miguel,
I might give you wrong impression. Custom made meant specially designed for our specific project. I just wanted to fix it.
However, I might can give you some information for you
RF coils for MRI book
http://www.wiley.com/WileyCDA/WileyTitle/productCd-0470770767.html
People wants to make their own MRI :-)
http://www.eevblog.com/forum/projects/building-an-mri-machine-(for-$100)/
Enjoy.
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