From owner-biophysics@net.bio.net Tue Feb 03 22:00:00 1998 Path: biosci!bloom-beacon.mit.edu!howland.erols.net!news-peer.gip.net!news.gsl.net!gip.net!news.voicenet.com!nntp.upenn.edu!red.seas.upenn.edu!kfoster From: kfoster@red.seas.upenn.edu (Kenneth R Foster) Newsgroups: sci.bio.technology,sci.med.physics,sci.physics.electromag,bionet.biophysics,can.med.misc,fr.sci.biometrie,sci.engr.biomed,sci.materials,sci.med.telemedicine Subject: Re: phantom simulated dielectric properties of human tissues Followup-To: sci.bio.technology,sci.med.physics,sci.physics.electromag,bionet.biophysics,can.med.misc,fr.sci.biometrie,sci.engr.biomed,sci.materials,sci.med.telemedicine Date: 4 Feb 1998 17:21:16 GMT Organization: University of Pennsylvania Lines: 42 Distribution: inet Message-ID: <6ba82c$b3q$1@netnews.upenn.edu> References: <34D7414A.716@lien.u-nancy.fr> <34D75184.1CD2@ix.netcom.com> NNTP-Posting-Host: red.seas.upenn.edu X-Newsreader: TIN [version 1.2 PL2-upenn1.3] : > I would like to use a phantom for simulating the dielectric : > properties of human tissues in the ELF freqency range(0-100kHz). : > Would you send me informations and documentations about existing : > products and phantom if you have. In the negative, would you : > give me links of whatever else. : All kidding aside, it depends on how accurately you want to model the body, and what the mechanical properties of the phantom need to be. In this frequency range the loss tangent of tissue is very high, i.e. you do not have to worry too much about the permittivity. For most purposes a simple saline solution should work. If you want to model anatomical structures, you will need to use some kind of gelling agent, taking care to keep the conductivity appropriate for tissue. Some conductivity data are in my review in the CRC Reviews on Biomedical Engineering published a few years ago, but other sources are available also. If you need to correctly model the permittivity as well, you are in trouble since there is no convenient (or feasible, I think() way to get the high permittivity values of tissue at low frequencies using simple phantom liquids. In case you are interested, there will be a conference on electrical bioimpedance in Barcelona, April 5-9, 1998, and a lot of people there would undoubtably be interested in your work. See Contact Prof. Pere Riu priu@eel.upc.es Departament d'Enginyeria Electrsnica Universitat Politicnica de Catalunya Campus Nord, Edifici C-4 C/ Gran Capit` s/n 08071 BARCELONA FAX: 34 - 3 - 401 67 56 http://petrus.upc.es/~wwwdib/homepageuk.html .