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Publications (10 of 11) Show all publications
Petrovic, N., Tomasic, I., Lindén, M. & Risman, P. O. (2019). Detection of Human Bodypart Abnormalities by Microwaves – A New Approach. In: 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics MIPRO 2019: . Paper presented at 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics MIPRO 2019, 20 May 2019, Opatija, Croatia (pp. 270-274).
Open this publication in new window or tab >>Detection of Human Bodypart Abnormalities by Microwaves – A New Approach
2019 (English)In: 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics MIPRO 2019, 2019, p. 270-274Conference paper, Published paper (Refereed)
Abstract [en]

We present modified antenna-like devices - applicators - for direct detection of internal inhomogeneities such as breast tumours and brain haemorrhages, at a frequency about 1 GHz. This direct detection provides the possibility of using a simple microwave generator and simple rectification and position registration of the received signals. Direct readouts are thus possible, without any massive computing resources as with tomographic imaging. The transmitting applicator is non-contacting and in free air close to the object. It generates an essentially quasistatic axial magnetic field which induces a circular electric field in the tissue. The receiving 3D contacting applicator contains a high-permittivity ceramic and is resonant. Its mode field provides the desired polarisation sensitivity and filters out the main electric field. The overall system sensitivity for detection of internal inhomogeneities is accomplished by optimised use of the orthogonality of the primary magnetic, induced electric, and diffracted electric fields. When developments are completed, the system will replace or complement existing commercial technologies at a low cost.

National Category
Engineering and Technology Computer Systems
Identifiers
urn:nbn:se:mdh:diva-43939 (URN)10.23919/MIPRO.2019.8757093 (DOI)000484544500051 ()2-s2.0-85070266490 (Scopus ID)
Conference
42nd International Convention on Information and Communication Technology, Electronics and Microelectronics MIPRO 2019, 20 May 2019, Opatija, Croatia
Projects
ESS-H - Embedded Sensor Systems for Health Research Profile
Available from: 2019-06-20 Created: 2019-06-20 Last updated: 2019-10-03Bibliographically approved
Petrovic, N. & Risman, P. O. (2018). A Zirconia Cylindrical TM010 Cavity for Permittivity Measurements at 1 GHz. In: 2018 IEEE CAMA Conference on Antenna Measurement and Applications CAMA 2018: . Paper presented at 2018 IEEE CAMA Conference on Antenna Measurement and Applications CAMA 2018, 02 Sep 2018, Västerås, Sweden.
Open this publication in new window or tab >>A Zirconia Cylindrical TM010 Cavity for Permittivity Measurements at 1 GHz
2018 (English)In: 2018 IEEE CAMA Conference on Antenna Measurement and Applications CAMA 2018, 2018Conference paper, Published paper (Refereed)
Abstract [en]

The most accurate dielectric measurements are made by resonant cavity methods, the circular TM010 type being the simplest and most common. However, an airfilled such cavity at 1 GHz needs to be 250 mm in diameter. There is another problem as well: its limited applicability with very lossy samples, due to a too low Q value. This paper describes the development and properties of a metalized zirconia ceramic cavity for use at about 1 GHz. With its permittivity ε′ = 30 its diameter becomes 40 mm instead of 150 mm for the airfilled version. Additionally and importantly, the dynamic range of the loss factor ε″ is greatly expanded. The calibration procedure using numerical retromodelling is described and a measurement example of a ternary alcohol mixture is carried out. The accuracy is also estimated.

National Category
Engineering and Technology Computer Systems
Identifiers
urn:nbn:se:mdh:diva-41728 (URN)10.1109/CAMA.2018.8530482 (DOI)2-s2.0-85058314267 (Scopus ID)978-1-5386-5795-9 (ISBN)
Conference
2018 IEEE CAMA Conference on Antenna Measurement and Applications CAMA 2018, 02 Sep 2018, Västerås, Sweden
Projects
ESS-H - Embedded Sensor Systems for Health Research Profile
Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2018-12-20Bibliographically approved
Risman, P. O. & Petrovic, N. (2018). Arch-Trapped Propagation in Enclosed and Free Space Biological Objects. In: 2018 IEEE CAMA Conference on Antenna Measurement and Applications CAMA 2018: . Paper presented at 2018 IEEE CAMA Conference on Antenna Measurement and Applications CAMA 2018, 02 Sep 2018, Västerås, Sweden.
Open this publication in new window or tab >>Arch-Trapped Propagation in Enclosed and Free Space Biological Objects
2018 (English)In: 2018 IEEE CAMA Conference on Antenna Measurement and Applications CAMA 2018, 2018Conference paper, Published paper (Refereed)
Abstract [en]

The tendency of arch-trapped microwave propagation at curved surfaces is a kind of diffraction which needs more attention in the development of measurement systems, from the oil industry to the investigations using antenna applicator systems for biological objects. We develop equations for propagation in very lossy substances in metal pipes. Similar such propagation occurs at the periphery of rounded objects in air, where also surface wave effects occur and can cause measurement problems. We show a modified contacting antenna applicator minimizing arch-trapped as well as surface waves.

National Category
Engineering and Technology Computer Systems
Identifiers
urn:nbn:se:mdh:diva-41729 (URN)10.1109/CAMA.2018.8530610 (DOI)2-s2.0-85058292798 (Scopus ID)978-1-5386-5795-9 (ISBN)
Conference
2018 IEEE CAMA Conference on Antenna Measurement and Applications CAMA 2018, 02 Sep 2018, Västerås, Sweden
Projects
ESS-H - Embedded Sensor Systems for Health Research Profile
Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2018-12-20Bibliographically approved
Hozhabri, M., Risman, P. O. & Petrovic, N. (2018). Comparison of UWB Radar Back-Scattering by the Human Torso and a Phantom. In: : . Paper presented at The International Conference on Antenna Measurement and Applications – 2018 IEEE CAMA.
Open this publication in new window or tab >>Comparison of UWB Radar Back-Scattering by the Human Torso and a Phantom
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

An Ultra Wide Band(UWB) radar is used to measure the cross section of a human phantom indifferent polarizations of the receiver antenna. The choice of material and shape for the human phantom is discussed. The material used in the experiment(wet sand) dielectric properties measured by a retromodeling technique and then calculated by mixture formulas. The appropriate frequency choice for the application is discussed.

Keywords
Ultra Wide Band, Radar, Human Detection, Phantom, Mie Scattering, Complex Permittivity
National Category
Engineering and Technology Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:mdh:diva-41309 (URN)10.1109/CAMA.2018.8530483 (DOI)2-s2.0-85058273104 (Scopus ID)
Conference
The International Conference on Antenna Measurement and Applications – 2018 IEEE CAMA
Available from: 2018-11-09 Created: 2018-11-09 Last updated: 2019-08-28Bibliographically approved
Petrovic, N. & Risman, P. O. (2018). Overview of microwave based diagnostics for breast tumours and strokes. In: World Congress on Medical Physics and Biomedical Engineering IUPESM 2018: . Paper presented at World Congress on Medical Physics and Biomedical Engineering IUPESM 2018, 03 Jun 2018, Prague, Czech Republic. (1)
Open this publication in new window or tab >>Overview of microwave based diagnostics for breast tumours and strokes
2018 (English)In: World Congress on Medical Physics and Biomedical Engineering IUPESM 2018, 2018, no 1Conference paper, Published paper (Refereed)
National Category
Engineering and Technology Computer Systems
Identifiers
urn:nbn:se:mdh:diva-41730 (URN)
Conference
World Congress on Medical Physics and Biomedical Engineering IUPESM 2018, 03 Jun 2018, Prague, Czech Republic
Projects
ESS-H - Embedded Sensor Systems for Health Research Profile
Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2018-12-18Bibliographically approved
Petrovic, N., Otterskog, M. & Risman, P. O. (2017). Breast tumor detection with microwave applicators in open air. In: 2017 IEEE Conference on Antenna Measurements & Applications (CAMA) CAMA 2017: . Paper presented at 2017 IEEE Conference on Antenna Measurements & Applications (CAMA) CAMA 2017, 03 Dec 2017, Tsumuba, Japan (pp. 272-274).
Open this publication in new window or tab >>Breast tumor detection with microwave applicators in open air
2017 (English)In: 2017 IEEE Conference on Antenna Measurements & Applications (CAMA) CAMA 2017, 2017, p. 272-274Conference paper, Published paper (Refereed)
Abstract [en]

A system for either direct use of diffraction phenomena or indirect use by computational methods for female breast tumor detection is described. The excitation device is a single external non-contacting, sectioned single turn loop, creating an axial magnetic field directed into the breast. A circulating current is created inside it and the diffracted field is directly sensed.

Keywords
microwave, coil antenna, surface wave, applicator, tumor detection, diffraction, deflection, E-field probe
National Category
Computer Systems
Identifiers
urn:nbn:se:mdh:diva-38651 (URN)10.1109/CAMA.2017.8273422 (DOI)000425256200076 ()2-s2.0-85046273190 (Scopus ID)978-1-5090-5028-4 (ISBN)
Conference
2017 IEEE Conference on Antenna Measurements & Applications (CAMA) CAMA 2017, 03 Dec 2017, Tsumuba, Japan
Projects
ESS-H - Embedded Sensor Systems for Health Research Profile
Available from: 2018-03-01 Created: 2018-03-01 Last updated: 2018-05-11Bibliographically approved
Petrovic, N., Otterskog, M. & Risman, P. O. (2017). Breast tumour detection by two microwave antenna principles. In: Proceedings of the 2017 19th International Conference on Electromagnetics in Advanced Applications, ICEAA 2017: . Paper presented at 19th International Conference on Electromagnetics in Advanced Applications, ICEAA 2017, 11 September 2017 through 15 September 2017 (pp. 1258-1261). Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Breast tumour detection by two microwave antenna principles
2017 (English)In: Proceedings of the 2017 19th International Conference on Electromagnetics in Advanced Applications, ICEAA 2017, Institute of Electrical and Electronics Engineers Inc. , 2017, p. 1258-1261Conference paper, Published paper (Refereed)
Abstract [en]

A comparison between breast tumour detection with a traditional lossy coupling medium based system and a system without coupling medium is performed, by numerical modelling and experimentally. While a system with lossy coupling medium offers surface wave reduction and protection from surrounding sources and obstacles it also demands good permittivity matching of the coupling medium to the breast tissue under investigation, as well as a high performance measurement system with a dynamic range exceeding 100 dB. The system without coupling medium offers possible direct detection of inhomogeneities with transmission losses of about 50...60 dB. The proposed contacting antenna system however needs further development in order to reduce stray fields and adoption to realistic breast tissue properties.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2017
Keywords
Antennas, Surface waves, Tissue, Tumors, Antenna system, Breast tissue properties, Breast tissues, Coupling medium, Direct detection, Inhomogeneities, Performance measurement system, Transmission loss, Microwave antennas
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:mdh:diva-37414 (URN)10.1109/ICEAA.2017.8065500 (DOI)000426455500237 ()2-s2.0-85035132369 (Scopus ID)9781509044511 (ISBN)
Conference
19th International Conference on Electromagnetics in Advanced Applications, ICEAA 2017, 11 September 2017 through 15 September 2017
Available from: 2017-12-07 Created: 2017-12-07 Last updated: 2018-03-22Bibliographically approved
Petrovic, N., Otterskog, M. & Risman, P. O. (2017). QUANTIFICATION OF INHOMOGENEITIES IN OBJECTS BY ELECTROMAGNETIC FIELDS. International applikation published under the patent cooperation treatu (PCT) .
Open this publication in new window or tab >>QUANTIFICATION OF INHOMOGENEITIES IN OBJECTS BY ELECTROMAGNETIC FIELDS
2017 (English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

A system and method, as well as sub assemblies thereof, for detection of dielectric irregularities/inhomogeneities inside an object under study (OUS) be means of electromagnetic energy are disclosed. The system comprises a loop/cylinder emitter configured to be located close to the OUS with its axis of symmetry directed towards the OUS. A feeding line feeds the emitter with an alternating current at an operating frequency to cause a magnetic field therein, which in turn will induce a propagating electromagnetic field in the OUS. In order to reduce propagating fields outside of the OUS, the circumference of the emitter is smaller than the free-space wavelength corresponding to the operating frequency, and the feeding line has a characteristic impedance that is smaller than 20 Ohm.

Place, publisher, year, edition, pages
International applikation published under the patent cooperation treatu (PCT), 2017
National Category
Engineering and Technology Computer Systems
Identifiers
urn:nbn:se:mdh:diva-38652 (URN)
Projects
ESS-H - Embedded Sensor Systems for Health Research Profile
Available from: 2018-03-01 Created: 2018-03-01 Last updated: 2018-03-01Bibliographically approved
Risman, P. O., Otterskog, M. & Petrovic, N. (2017). Översikt av mikrovågsbaserad diagnostik för brösttumörer och stroke. In: Medicinteknikdagarna 2017 MTD 2017: . Paper presented at Medicinteknikdagarna 2017 MTD 2017, 09 Oct 2017, Västerås, Sweden. Västerås, Sweden
Open this publication in new window or tab >>Översikt av mikrovågsbaserad diagnostik för brösttumörer och stroke
2017 (English)In: Medicinteknikdagarna 2017 MTD 2017, Västerås, Sweden, 2017Conference paper, Published paper (Refereed)
Abstract [en]

Forskningsområdet mikrovågsavbildning inom medicinen introducerades redan på 1980-talet av Larsen och Jacobi [1]. Objektet var en hundnjure nedsänkt i en mikrovågsabsorberande vätska (bolus) för att undvika störningar och direkt koppling mellan de två roterande antennmatriserna. Man fann att intressant mikrovågskontrastverkan kunde uppnås i biologiska objekt. Fördelar jämfört med mammografi är ex.vis att strålningen är helt ofarlig och att man kan »se» närmare revbenen. Nackdelen är att detaljbilden blir sämre om objektet är stort. Ett relativt enkelt sådant system har utvecklats på MDH [2]. System av denna typ innefattar krav på omfattande matematiska beräkningar för att få fram en bild. Idag anses den ledande utvecklingen ske av Meaney [3] som nu även tar fram ett system på Chalmers i Göteborg. System för stroke- och hjärnblödningsdetektion är under utveckling hos EMTensor i Österrike [4,5] och Medfield diagnostics i Göteborg [6]. Problemen med direkt vågutbredning med s.k. ytvågor längs skallytan blir stora eftersom man inte kan sänka ned skallen i vätska. Absorberande s.k. bolusar och även viss metallisk avskärmning (»huva») används av EM Tensor. En forskningsgrupp under Abbosh [7] har i laboratoriemiljö helt utan störningar lyckats uppnå vissa resultat utan bolusanvändning. Typiska antenner är modifierade kommunikationsantenner och man använder ett spektrum av frekvenser. Återigen blir systemen beräkningsintensiva. På MDH utvecklas f.n. två olika system. Det första har tredimensionella antenner och speciella åtgärder för eliminering av ytvågorna [8] samt kräver matematiska beräkningar som alla de föregående. Det andra bygger på en annan princip: polariserad direktdetektion av den. s.k. diffraktionen från exv. hjärnblödningsområdet och användning av vad som inte är antenner i vanlig mening [9]. Endast mycket enkel bildbehandling krävs, inte heller statistisk träning krävs för framtagning av slutdata så som tillämpas i exv. oljeindustrin för bestämning av olja/vatten/gas med mikrovågsteknik. Sammanfattningsvis karaktäriseras området av ett flertal aktiviteter, varav några pågått i många år. Orsaker till tidsutdräkterna är dels givetvis de allmänna svårigheterna med mikrovågsavbildning, men en ytterligare orsak är att mikrovågsvetenskapen och tekniken i sig är tvärvetenskaplig. En konsekvens av detta är att man inte tillräckligt tidigt ägnat sig åt de speciella ytvågs- och diffraktionsfenomen som kan förbättra mätresultaten.

Place, publisher, year, edition, pages
Västerås, Sweden: , 2017
National Category
Medical Engineering
Identifiers
urn:nbn:se:mdh:diva-38650 (URN)
Conference
Medicinteknikdagarna 2017 MTD 2017, 09 Oct 2017, Västerås, Sweden
Projects
ESS-H - Embedded Sensor Systems for Health Research Profile
Available from: 2018-03-02 Created: 2018-03-02 Last updated: 2018-03-02Bibliographically approved
Petrovic, N., Otterskog, M. & Risman, P. O. (2015). Experiments and numerical modelling of contacting antenna applicators at a free space head model. In: 2015 IEEE International Conference on Antenna Measurements & Applications (CAMA) CAMA 2015: . Paper presented at 2015 IEEE International Conference on Antenna Measurements & Applications (CAMA) CAMA 2015, 30 Nov - 02 Dec. 2015, Chiang Mai, Thailand. , Article ID 7428125.
Open this publication in new window or tab >>Experiments and numerical modelling of contacting antenna applicators at a free space head model
2015 (English)In: 2015 IEEE International Conference on Antenna Measurements & Applications (CAMA) CAMA 2015, 2015, article id 7428125Conference paper, Published paper (Refereed)
Abstract [en]

Microwave absorbing boluses or similar are impractical, particularly in stroke emergencies, since the creation of surface waves around the head dominating over the internal signal paths is then a problem. The performance of miniaturised ridged waveguide applicators in the frequency interval 1 to 3 GHz designed for the application of breast cancer detection are used in this study, slightly modified, on head models for investigation of disturbing surface waves.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:mdh:diva-32797 (URN)10.1109/CAMA.2015.7428125 (DOI)000380437900016 ()2-s2.0-85006055105 (Scopus ID)978-1-4673-9149-8 (ISBN)
Conference
2015 IEEE International Conference on Antenna Measurements & Applications (CAMA) CAMA 2015, 30 Nov - 02 Dec. 2015, Chiang Mai, Thailand
Projects
ESS-H - Embedded Sensor Systems for Health Research Profile
Available from: 2016-09-01 Created: 2016-08-24 Last updated: 2019-06-25Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-2118-9354

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