chris maxwell wrote: Hi Amund,
I read your email (below). I'm no medical device expert; but I'm wondering if the magnetic strength limit was set so high due to MRI (Magnetic Resnonance Imaging) devices. My understanding is that MRI devices produce HUGE magnetic field levels. According to a recent newspaper story that I read, these fields are strong enough to draw a metal oxygen tank across the room to the MRI machine. This is one version of the story: Yes it's true, and the patient in the MRI machine died after the cylinder impacted the scanning region of the machine in which he (male child) was located. The accident was a failure of safety procedures caused by a medical assistant who carried the oxygen cylinder into the scanning room and whose action remained un-noticed at the time due a medical emergency, I think the patient was having an asthma attack. >From personal experience they will not give you a head MRI without first >seeing a clean X ray of your head checked for residual metal particles. In >particular they are looking for contamination of the eye from by-products of >metal grinding and machining. the field strength measured at the target is expressed in single digit Tesla figures, like 3 or 4 Tesla. Respect you local MRI operating team!!!!!! ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
