Two Methods for Modelling the Propagation of Terahertz Radiation in a Layered Structure |
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Authors: | GC Walker E Berry SW Smye NN Zinov'ev AJ Fitzgerald RE Miles M Chamberlain MA Smith |
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Institution: | (1) Academic Unit of Medical Physics, University of Leeds, UK;(2) Department of Medical Physics and Engineering, Leeds Teaching Hospitals NHS Trust, UK;(3) Institute of Microwaves and Photonics, University of Leeds, UK |
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Abstract: | Modelling the interaction of terahertz(THz) radiation with biological tissueposes many interesting problems. THzradiation is neither obviously described byan electric field distribution or anensemble of photons and biological tissueis an inhomogeneous medium with anelectronic permittivity that is bothspatially and frequency dependent making ita complex system to model.A three-layer system of parallel-sidedslabs has been used as the system throughwhich the passage of THz radiation has beensimulated. Two modelling approaches havebeen developed a thin film matrix model anda Monte Carlo model. The source data foreach of these methods, taken at the sametime as the data recorded to experimentallyverify them, was a THz spectrum that hadpassed though air only.Experimental verification of these twomodels was carried out using athree-layered in vitro phantom. Simulatedtransmission spectrum data was compared toexperimental transmission spectrum datafirst to determine and then to compare theaccuracy of the two methods. Goodagreement was found, with typical resultshaving a correlation coefficient of 0.90for the thin film matrix model and 0.78 forthe Monte Carlo model over the full THzspectrum. Further work is underway toimprove the models above 1 THz. |
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Keywords: | Biological tissue modelling Monte Carlo simulation skin terahertz |
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