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Re: [Open-rtms-list] Open-rtms-list Digest, Vol 21, Issue 4
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From: superkuh <sup...@su...> - 2016-12-18 08:44:12
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A static magnetic field does absolutely nothing. The mechanism of action by which TMS works is the rapidly changing magnetic field. Only the rate in change of the magnetic field matters. The rate in change is proportional to the induced voltage. It's a simple application of high school physics in the form of faraday's law. With regard to the electromagnets you linked, those won't work either because their inductance is far too high to get a high rate in change in current. Without a high rate in change of current you can't get a high rate in change in the magnetic field and no voltage will be induced. The form and construction of TMS machines, and particularly rTMS machines exists for a reason. They use stimulator coils with relatively low inductance, perhaps only 10-20 microhenries. And even with such low inductance very high voltages in the pulse power system are still required so that the current in the coil has a high rate of change. You simply cannot get around this without abandoning the mechanism by which TMS works. Sorry, but your suggest will not work and cannot work. - superkuh On 12/17/2016 06:03 AM, ope...@li... wrote: > Send Open-rtms-list mailing list submissions to > ope...@li... > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.sourceforge.net/lists/listinfo/open-rtms-list > or, via email, send a message with subject or body 'help' to > ope...@li... > > You can reach the person managing the list at > ope...@li... > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Open-rtms-list digest..." > > > Today's Topics: > > 1. Post list (Rub?n MD) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 16 Dec 2016 19:07:50 +0000 > From: Rub?n MD <sk...@ho...> > Subject: [Open-rtms-list] Post list > To: "ope...@li..." > <ope...@li...> > Message-ID: > <HE1PR03MB1755BB80250D68688A68E677B99C0@HE1PR03MB1755.eurprd03.prod.outlook.com> > > Content-Type: text/plain; charset="utf-8" > > > Hi, > > I am a new user and I would like to post in the forum/list. My message is: > > Hi everyone, > > I am not an expert in electronic or neurology, but as all of you I am really interested in making and TMS (to treat depression in my case). > > Sometime ago I tried with neodymium magnets that have the suck power of 25 kg and 80 kg but I didn't have success whit them (I usually tried to move them in the area in the head tipically used with TMS). > > Now I have another simple idea and I would like to share with all of you, I know that is so simple but I think its interesant and is: > > Why don't use a solenoid that creates a magnetic field (maybe similar than TMS devices)? That is an electromagnet available in different sizes to get different strenghts. Logically to be more similar to a rTMS it would have to create the magnetic fields for only microseconds and repeat it for much times. > > For example in aliexpress.com<http://aliexpress.com> there are a lot very cheaps with strenght of 10 kg, 25 kg, 40 kg, 80 kg... > > I think the most interesant model would create a strenght of around 1 Tesla, what would be, about 10 kg? > > What do you think? At least I would like to know your opinions about why to discard this option. > > I hope to give you an interesant point. > > Thanks everybody and sorry for my english. > > Rub?n > -------------- next part -------------- > An HTML attachment was scrubbed... > > ------------------------------ > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > > ------------------------------ > > _______________________________________________ > Open-rtms-list mailing list > Ope...@li... > https://lists.sourceforge.net/lists/listinfo/open-rtms-list > > > End of Open-rtms-list Digest, Vol 21, Issue 4 > ********************************************* |