From the March 2011 issue of HealthCare Business News magazine
Once it has been determined that a magnetic active cancellation is the appropriate solution for an EMI issue, a set of coils will need to be installed in the MRI suite. It’s best to install the coils during the RF shield installation as the cable can be installed behind interior finishes. If an EMI issue develops later and a facility can’t or chooses not to open interior walls to conceal coils, the coils could be mounted in an exposed coil tray.
After the MRI is in place and has been brought up to field, the magnetic active cancellation system can be setup, calibrated and tested. A proper magnetic active cancellation system will account for the natural EMI attenuation from the MRI’s magnetic field.
The Result from Eliminating Electromagnetic Interference
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The actual benefits of the system will vary and are dependent upon the specific EMI conditions for a site. For example, disturbances that only slightly exceed the MRI specifications may only create issues with functional MRI sequences, but much larger disturbances may begin to impact spectroscopy and gradient echo sequences.
Conclusion
When faced with an EMI challenge, an owner has options available to resolve the problem that do not involve abandoning the site. In these situations, it is critical for the owners to identify a company that will provide a professional assessment of the situation and work closely with the owner to identify the best possible solution for that specific application. The owner and solution provider should consider the costs, flexibility, versatility and reliability of a given solution before making a decision. With some care and attention to details with the appropriate assistance of a knowledgeable EMI solution provider, an owner can turn a challenging site into a productive, fully functioning MRI imaging suite.
Joel Kellogg is a Manager of Technical Engineering and Consulting with ETS-Lindgren in Glendale Heights, IL. His experience includes design of MRI suites to meet various acoustic, vibration, EMI and radio frequency shielding requirements.
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