For those of you who haven't seen one, an NMR is a machine that uses RF energy to scan patients, who slide (almost entirely) into a hole inside the machine. The hole has an RF transmitting and receiving antenna. If the energy stays within the scanning 'hole', and within the outside boundaries of the machine, is the energy still considered 'internal' to the equipment? Or is the fact that the system has an RF antenna beaming energy into the hole, mean that the energy is 'external' to the machine.?
On Wed, 1 Jul 1998 07:58:07 -0600, "Lyle Luttrell" <[email protected]> wrote: >In classification for CISPR 11, one should consider whether the RF >energy is intended to perform a function related to the intended use of the >device. For Group 1 the RF energy is "necessary for internal functioning >of the equipment ", which implies that any external RF radiation would be >unintentional. While the Group 2 definition specifies "treatment of >material", it can be appropriate in many other cases where RF energy is >intentionally generated to perform the equipment function. For an NMR >diagnostic device, I think that a good case can be made that the device >should be Group 2. > >Lyle Luttrell >Luttrell & Associates > >-----Original Message----- >From: [email protected] <[email protected]> >To: [email protected] <[email protected]> >Date: Tuesday, June 30, 1998 11:47 AM >Subject: NMR device classification > > >> >> >> >>We have some trouble about the classification according to CISPR 11 of a >>diagnostic NMR device. In my opinion the radio frequency energy is NOT >>genereted for treatment of material (human body). This condition applies >>only to therapy equipment that produce some change in the body. For that >>reason this is a group 1 device. Someone else disagree with me, of course. >>Does anybody have any opinion or experience about the matter?. >>Thanks. >>------------------------------------------------------- >>ESAOTE S.p.A. Massimo Polignano >>Research & Product Development Regulatory Affairs >>Via di Caciolle,15 tel:+39.055.4229402 >>I- 50127 Florence fax:+39.055.4223305 >> e-mail: [email protected] >> > > > -- Patrick Lawler [email protected]
