I have placed a paper with the above title on the Web in order to put forth many reasons to believe that present day descriptions of magnetic fields are incorrect. The address is: http://www.mcs.com/~chappell/magnetism/magnetism.html Here I describe my model of magnetic fields, which includes the separate fields for the two forces from dipole atoms and a description of the alignment of atoms in both the bar magnet and a current carrying conductor. I encourage comments and inquiries from interested parties. The purpose of the paper is to attempt to convince readers that this phase of physics is a wide open field ready for many discoveries. Howard L. Chappell chappell@mcs.comReturn to Top
Is NMR and MRI considered the same in the medical field? NMR=Nuclear Magnetic resonanceReturn to Top
Magnetic Resonance Imaging (MRI) used to be called by its more descriptive name, NMR Imaging, however the medical profession got too many concerned queries from patients on the use of a "nuclear" technique, which the uninformed associated with radiation and danger. NMR imaging is now universally referred to as MRI in medical journals. You can find some discussions of this in the New England Journal of Medicine prior to 1980. Andrew C. Kolbert NMR Spectroscopist DSM Copolymer Inc Baton Rouge, LAReturn to Top
jsnodgrass (jsnodgrass@mho.net) wrote: : Is NMR and MRI considered the same in the medical field? : NMR=Nuclear Magnetic resonance Possibly; although they aren't the same. MRI=Magnetic Resonance Imaging. Within physics and physical chemistry, NMR is not normally associated with imaging, but with chemical analysis. And magnetic resonance in general could be said to include electron spin resonance (ESR) and NMR.Return to Top
A friend had an MRI scan done for a jaw condition. He reported that the acoustical noise was very unpleasant. He said that about every second in time, there was a very loud "Bang" noise as though a hammer struck metal. Is this the correct place to request an explaination?Return to Top
From: jamesl@netcom.com (James Logajan) :jsnodgrass (jsnodgrass@mho.net) wrote: : Is NMR and MRI considered the same in the medical field? : NMR=Nuclear Magnetic resonance >Possibly; although they aren't the same. MRI=Magnetic Resonance Imaging. >Within physics and physical chemistry, NMR is not normally associated with >imaging, but with chemical analysis. And magnetic resonance in general could >be said to include electron spin resonance (ESR) and NMR. ESR imaging is not used in medicine, though there are some academic groups working on developing it. The problem with ESR imaging is that you have to introduce a toxic level of nitrosyl radicals to get a decent image. Not exactly what we hope for in a non-invasive technique. Andrew C. KolbertReturn to Top
Dear Colleagues To analyse our MRI perfusion studies we need better software than the one provided on our MRI scanner. What we would like to produce are not only perfusion curves, but a colored presentation of pixels that has changed in intensity by a input given percentage. We would also like to know how many of these pixels there are compared to the number of pixels found in a traced out tumor. This to help rule out possible blood vessels. I any of you know of such software, please contact me by e-mail. (Our scanner is a Philips ACS-NT) Sincerely Kjell-Inge Gjesdal, Ph.DReturn to Top