1. The magnetic field is then detected by sensing coils. MIT is sensitive to all three passive electromagnetic properties: conductivity, permittivity and permeability. 1- 1- A higher conductivity value indicates that there are more chemicals dissolved in the water. Pure, distilled water is a very poor conductor of electricity. 2 - 2 - Permittivity is related to non free charges and dielectric phenomenon. 3 - 3 - The soft iron is more permeable to the magnetic field than the air is. Notice how the field seems to focus the magnetic field. This is a result of the iron actually becoming a magnet while placed in the existing field. Acknowledgments: Prof. Raul Martins Master in Biomedical Engineering, IST/FML 1 st Year, 1 st Semester Lisbon, Portugal Introduction to Biomedical Engineering, Group XVII Jovchelevitch, Flávio Leal¹; Branco, Mariana Pedroso²; Levy, Rita Pissarra³ ¹flavio.jovchelevitch@ist.utl.pt, ²mariana.branco@ist.utl.pt, ³rita.levy@ist.utl.pt Magnetic Induction Tomography (MIT) Magnetic Induction Tomography (MIT) is a recent tomographic imaging technique related to the contactless measurement of impedances. Since biological tissues possess distinguishable electrical properties, an experimental system has been developed which recognizes different tissues by means of the different impedance values. Magnetic field lines with (above) and without body (under). During the last decade, different tomography techniques have contributed to medical diagnosis, although not all techniques have the same purpose, they all work together in order to obtain a better examination. MIT is aiming at complementing different imaging techniques which currently in use, however no MIT system has reached routine use either industrially or medically, despite the fact that a number of experimental systems exist. 1 2 3 Eddy currents, also known as Foucault currents, are an electromagnetic phenomenon caused when a conductor is exposed to a changing magnetic field. As a result, electromagnets appear which have a magnetic field that opposes the changes of the original field. Magnetic Induction Tomography is a portable, harmless and contactless imaging technique. However, it can only do superficial measurement, there is also some difficulty in reducing noise and the technical challenges in acquiring good-quality data are yet considerable. MIT is being aimed to the fetal imaging since it has noninvasive properties and potentially the ability for measuring fetal characteristics. MIT is directed toward tumor identification and localization, cardiac stroke volume detections, excessive iron problems, edemas and bone tissues problems. MIT, as envisaged, will be able to reduce some exorbitant prices and offer the same resolution and imaging quality to medical institutions. Thanks to all the advantages and disadvantages of MIT, it is obvious the need for this new imaging technology, and its insertion on global market, or of some other imaging technique which can provide high contrast of soft tissues, has a short turnover, is fast, cheap and portable and does not require specialized operator manipulation or interpretation Jovchelevitch, Flávio, Branco, Mariana, Levy, Rita: Magnetic InductionTomography, Report, 10/12/2008, IEB, IST/FML; Http://www.eee.metu.edu.tr/~bme/eit.html; Http://www.mems.utah.edu/theses/Gale_Dissertation.htm; Http://www.biomedical-engineering-online.com/content/6/1/37; Http://butler.cc.tut.fi/~malmivuo/bem/bembook/25/25.htm. 123