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Bone Dielectric Property Variation as a Function of Mineralization at Microwave Frequencies
2012
International Journal of Biomedical Imaging
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In this paper we investigate the microwave dielectric properties of ex vivo trabecular bone with respect to bulk density measures. ...
We exploit a variation in our tomographic imaging system in conjunction with a new soft prior regularization scheme that allows us to accurately recover the dielectric properties of small, regularly shaped ...
Van Citters and Eugene Santos from Thayer School of Engineering for their valuable discussions. ...
doi:10.1155/2012/649612
pmid:22577365
pmcid:PMC3345233
fatcat:s23qvcc26vdmxkrsodyzibgati
Is there any information on micro-structure in microwave tomography of bone tissue?
2013
Medical Engineering and Physics
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In this work, two-dimensional simulations of the microwave dielectric properties of models with ellipses and realistic models of trabecular bone tissue are performed. ...
We consider the feasibility of using the dielectric behaviour of bone tissue to be an indicator of bone health. The frequency used was 950 MHz. ...
C.M.C. and F.V. are members of CON-ICET. ...
doi:10.1016/j.medengphy.2012.12.014
pmid:23352612
fatcat:n4fwxpsrpja2lgfypxatpwto24
Evanescent microwaves: a novel super-resolution noncontact nondestructive imaging technique for biological applications
1999
IEEE Transactions on Instrumentation and Measurement
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Here we introduce a new method for imaging biological materials through air or a suitable liquid using decaying or evanescent fields at the tip of a properly designed microwave resonator. ...
In the case of STM the specimen needs to be conducting as well. ...
Microwave properties of a material are a function of permittivity, permeability, and free carrier concentration [6] . ...
doi:10.1109/19.816123
fatcat:fh4glhcvlnhdri6ho3bvopywc4
Microwave Bone Imaging: A Preliminary Investigation on Numerical Bone Phantoms for Bone Health Monitoring
2020
Sensors
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The bone phantoms were designed as a two-layered circular structure, where the outer layer mimics the dielectric properties of the cortical bone and the inner layer mimics the dielectric properties of ...
Microwave tomography (MWT) can be used as an alternative modality for monitoring human bone health. ...
A comprehensive review of bone dielectric properties in the microwave frequency range by Amin et al. ...
doi:10.3390/s20216320
pmid:33167562
pmcid:PMC7664235
fatcat:o3sal2mrdjay5nkdlw5clqo6gq
Microwave Tomographic Imaging Utilizing Low-Profile, Rotating, Right Angle-Bent Monopole Antennas
2014
International Journal of Antennas and Propagation
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This opens the door for more advanced imaging applications where anisotropy could play an important role such as in bone imaging. ...
For the application presented here a full set of measurement data is collected from most illumination and receive directions utilizing only a pair of antennas configured with the rotating fixture underneath ...
Epstein while at the Thayer School of Engineering (Dartmouth College, Hanover, NH, USA), with financial support provided by NIH/NCI Grant no. PO1-CA080139 and NSERC CREATE I3T Program. ...
doi:10.1155/2014/431602
fatcat:7v3cifipxzadddxz22w4hzvkvi
Towards sustainable processing of columbite group minerals: elucidating the relation between dielectric properties and physico-chemical transformations in the mineral phase
2017
Scientific Reports
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2017) Towards sustainable processing of columbite group minerals: elucidating the relation between dielectric properties and physico-chemical transformations in the mineral phase. ...
The dielectric values were measured, using a vector network analyser (VNA) at a fixed frequency (2470 MHz), close to the allocated microwave heating frequency of 2450 MHz. ...
as a function of the frequency, described by equation (1) : ε ε ε εε εε = ′ − ″ = ′ − ″ j j (1) o r o r where ε 0 is the dielectric permittivity of the vacuum, ε′ and ε′′ are the real and imaginary parts ...
doi:10.1038/s41598-017-18272-3
pmid:29269887
pmcid:PMC5740152
fatcat:5jihd5jc4jeqxfoptr4kgd3gqm
Targeted nanoparticles for simultaneous delivery of chemotherapeutic and hyperthermia agents – An in vitro study
2014
Journal of Photochemistry and Photobiology. B: Biology
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We investigated in our research the delivering nanoparticles to the tumorous tissue as a function of time in order to optimize the beginning time of microwave hyperthermia treatment. ...
We also follow the other parameters which could affect the effect process of microwave hyperthermia -the value of dielectric parameters of treated tissues. Streszczenie. ...
The knowing of dielectric properties of bone is very important because their influenced the electromagnetic energy distribution during microwave hyperthermia. ...
doi:10.1016/j.jphotobiol.2014.04.012
pmid:24859437
fatcat:jcwcav5karb6npj4k26bneq27m
On the Design and Development of Planar Monopole Antenna for Bone Crack/Void Detection
2022
International Journal of Antennas and Propagation
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The presence of a crack in the bone is detected by observing the shift in the peak resonating frequency of the antenna. This method can detect bone fractures in a noninvasive manner. ...
The resonant frequency of the designed antenna is 2.45 GHz. The antenna offers a gain of 1.68 dB and an efficiency of 85.3%. ...
Introduction e importance of bones in the human body is well understood. ey perform important functions such as mineral storage and providing mechanical strength to soft tissues and organs. ...
doi:10.1155/2022/4663488
doaj:8d8263e161c34735bae7314dede90ce0
fatcat:4gqzqrl3xbevbpuuiujozuar4a
Terahertz Pulsed Spectroscopy for Optical and Dielectric Properties of Demineralized Bone Matrix, Collagen and Hydroxyapatite
2019
Egyptian Journal of Chemistry
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THz dielectric properties acted as a sensitive predictor to the composition and microstructure of bone in different biological applications. ...
D EMINERALIZED bone matrix (DBM) has osteoinductive potential functioning in many biological applications such as three-dimensional scaffold which assist new bone and cartilage growth by enhanced bioavailability ...
Azza Ward, professor of physics at Microwave Physics and Dielectrics Department, National Research Centre, Egypt for her advice and revision of the dielectric part in this study. ...
doi:10.21608/ejchem.2019.14201.1876
fatcat:uptqvxxylrelxkdihjowxtzjtu
Experimental Validation of Microwave Imaging Prototype and DBIM-IMATCS Algorithm for Bone Health Monitoring
2022
IEEE Access
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The evaluation of the microwave imaging (MWI) prototype and imaging algorithms on experimental bone phantoms is a precursor step before clinical testing for measuring in vivo dielectric properties of human ...
The reconstruction of dielectric properties of bone phantoms have shown that L 2 -IMATCS approach provides a robust reconstruction of diverse bone phantoms with acceptable accuracy. ...
He is currently a Research Lecturer in medical technologies and the Co-Director of the Smart Sensors Laboratory, National University of Ireland, Galway. ...
doi:10.1109/access.2022.3167715
fatcat:nfzlhcrlkvbmbjmh2p6hz5wf2a
Permittivity and Measurements
[chapter]
2005
Encyclopedia of RF and Microwave Engineering
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Figure 14 shows the dielectric properties of Red Delicious apples as a function of frequency at three selected moisture contents and two measured temperatures. ...
Dielectric properties of selected ceramics as a function of temperature and fre-quency have also been studied [5] . ...
doi:10.1002/0471654507.eme308
fatcat:qt34tqpwbvfproqiixbahzgxau
Localization and Permittivity Extraction ofan Embedded Cylinder UsingDecomposition of the Time ReversalOperator
2020
IET Microwaves, Antennas & Propagation
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The background dyadic Green function (DGF) is computed analytically by computing radiated fields of an infinitesimal electric dipole near an infinitely long dielectric cylinder. ...
In this study, first, the problem of time reversal imaging of an embedded dielectric or metallic cylinder inside another dielectric cylinder is studied. ...
In another example, the dielectric properties of the bone change at different stages of osteoporosis. Current methods use bone mineral density to assess bone health [9] . ...
doi:10.1049/iet-map.2018.5731
fatcat:zectnatv7fanzksuvdof7fjc7a
Microwave Imaging and Emerging Applications
2012
International Journal of Biomedical Imaging
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Much of the interest has been based on the fact that tissue dielectric properties embody important information about physiological state and function. ...
The former primarily utilizes transmission data, in combination with an inverse algorithm, produces maps of the interrogated dielectric properties. ...
The studies on bone dielectric property variations with respect to mineral density set the stage for applying microwave imaging in the area of osteoporosis detection and bone health monitoring which is ...
doi:10.1155/2012/252093
pmid:22649444
pmcid:PMC3357517
fatcat:v335koga5zdg3mhsowlnbihrcm
Wireless Monitoring of Biological Objects at Microwaves
2021
Electronics
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The biological object monitoring is based on a consideration of the following problems: (i) dielectric properties of a biological issue; (ii) EM wave propagation in biological medium; (iii) propagation ...
Electromagnetic (EM) wave propagation inside and along the surface of the human body is the subject of active research in the field of biomedical applications of microwaves. ...
Conflicts of Interest: The authors declare no conflict of interest. ...
doi:10.3390/electronics10111288
fatcat:em5zd6fv2zcqxjshkpvloq5px4
Evaluation of non-thermal microwave effects on bovine lens by measuring S-parameters induced by variations in dielectric coefficient
2021
IEEE Access
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Dielectric properties of bones had obtained significant attentions to diagnose the osteoporosis due to the correlation between the dielectric property and bone mineral density [39] [40] . ...
Many researches had proved that the dielectric coefficient, at microwave frequencies, could describe the physiological state of biological tissues. ...
doi:10.1109/access.2021.3071271
fatcat:e5sv3jwos5fnncwkhm3wsmbn54
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