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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).
Öppna denna publikation i ny flik eller fönster >>Detection of Human Bodypart Abnormalities by Microwaves – A New Approach
2019 (Engelska)Ingår i: 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics MIPRO 2019, 2019, s. 270-274Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Nationell ämneskategori
Teknik och teknologier Datorsystem
Identifikatorer
urn:nbn:se:mdh:diva-43939 (URN)10.23919/MIPRO.2019.8757093 (DOI)000484544500051 ()2-s2.0-85070266490 (Scopus ID)
Konferens
42nd International Convention on Information and Communication Technology, Electronics and Microelectronics MIPRO 2019, 20 May 2019, Opatija, Croatia
Projekt
ESS-H - Embedded Sensor Systems for Health Research Profile
Tillgänglig från: 2019-06-20 Skapad: 2019-06-20 Senast uppdaterad: 2019-10-03Bibliografiskt granskad
Petrovic, N., Pichot, C. & Risman, P. O. (2019). Further Developments of Applicator Concepts for Detection of Body Part Inhomogeneities. In: 2019 IEEE CAMA Conference on Antenna Measurement and Applications 2019 CAMA: . Paper presented at 2019 IEEE CAMA Conference on Antenna Measurement and Applications 2019 CAMA, 22 Oct 2019, Denpasar, Bali, Indonesia.
Öppna denna publikation i ny flik eller fönster >>Further Developments of Applicator Concepts for Detection of Body Part Inhomogeneities
2019 (Engelska)Ingår i: 2019 IEEE CAMA Conference on Antenna Measurement and Applications 2019 CAMA, 2019Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We present significant improvements on in particular our transmitting applicator and its performance. This is a crucial component of our system for direct detection of internal inhomogeneities such as breast tumors and brain hemorrhages by a special transmitting applicator and specially polarized receiving applicators. The operating frequency is about 1 GHz. The transmitting applicator is unique by no need to contact the object under study (OUS) and does not generate any surface waves at it. The primary field has properties behaving as from a magnetic monopole. The overall system allows direct detection without a need for phase measurements, which provides the possibility of using a simple microwave generator and simple rectification and position registration of the received signals. The receiving 3D contacting applicator contains a high-permittivity ceramic and is resonant in order to provide the desired field polarization sensitivity. The desired system properties are achieved by optimized use of the orthogonality properties of the primary magnetic, induced electric, and diffracted electric fields.

Nyckelord
Microwaves, applicators, diffraction, bolus liquid, detection, medical application.
Nationell ämneskategori
Teknik och teknologier Datorsystem
Identifikatorer
urn:nbn:se:mdh:diva-46318 (URN)
Konferens
2019 IEEE CAMA Conference on Antenna Measurement and Applications 2019 CAMA, 22 Oct 2019, Denpasar, Bali, Indonesia
Projekt
ESS-H - Embedded Sensor Systems for Health Research Profile
Tillgänglig från: 2019-12-12 Skapad: 2019-12-12 Senast uppdaterad: 2019-12-12Bibliografiskt granskad
Risman, P. O., Petrovic, N., Tomasic, I. & Lindén, M. (2019). New work on radiofrequency electric and electromagnetic leakage hazards for operators safety assessments. In: Medicinteknikdagarna 2019 MTD 2019: . Paper presented at Medicinteknikdagarna 2019 MTD 2019, 02 Oct 2019, Linköping, Sweden.
Öppna denna publikation i ny flik eller fönster >>New work on radiofrequency electric and electromagnetic leakage hazards for operators safety assessments
2019 (Engelska)Ingår i: Medicinteknikdagarna 2019 MTD 2019, 2019Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Abstract [en]

Various medical and industrial equipment types with electric fields having frequencies in the range 13 to 40 MHz have a long history. The relative simplicity of the generators and applicators (i.e. the assembly which is adapted for the treatment) have led to equipment manufacturing by many small companies having insufficient knowledge about human exposure hazards. The international regulations on maximum allowed exposure are not well-developed and mainly concern limits of the measured electric field, so-called reference levels, which are set to low values considered to be safe under all possible conditions. – Quite some scientific work on the field characteristics has been carried out since the 1970’s, the goal in many cases having been to motivate further research grants rather than assisting industry in improving safety by proposing more detailed regulations. In particular, researchers have used the electric field strengths as measured, without consideration of the field curvature and decay rate from the equipment, and by also using a too simplistic approach to the “power flux density” of the field emission. – As a consequence of the above, it is estimated that over 90 % of today’s operational equipment does not fulfill these simple regulations. In spite of that, very few incidents or accidents are reported. – New ongoing work by the International Electrotechnical Commission (IEC; committee 27) is now explaining this. The work is based on advanced numerical modelling of typical kinds of equipment and humans in different postures of arms and hands. Some results will be demonstrated and indicate that from five to more than twenty times stronger fields can be accepted under conditions of limited direct access to the energised equipment parts such as electrodes and rails, and proper design of the system grounding.

Nationell ämneskategori
Teknik och teknologier Medicinteknik
Identifikatorer
urn:nbn:se:mdh:diva-46317 (URN)
Konferens
Medicinteknikdagarna 2019 MTD 2019, 02 Oct 2019, Linköping, Sweden
Projekt
ESS-H - Embedded Sensor Systems for Health Research Profile
Tillgänglig från: 2019-12-12 Skapad: 2019-12-12 Senast uppdaterad: 2019-12-12Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>A Zirconia Cylindrical TM010 Cavity for Permittivity Measurements at 1 GHz
2018 (Engelska)Ingår i: 2018 IEEE CAMA Conference on Antenna Measurement and Applications CAMA 2018, 2018Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Nationell ämneskategori
Teknik och teknologier Datorsystem
Identifikatorer
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)
Konferens
2018 IEEE CAMA Conference on Antenna Measurement and Applications CAMA 2018, 02 Sep 2018, Västerås, Sweden
Projekt
ESS-H - Embedded Sensor Systems for Health Research Profile
Tillgänglig från: 2018-12-18 Skapad: 2018-12-18 Senast uppdaterad: 2018-12-20Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>Arch-Trapped Propagation in Enclosed and Free Space Biological Objects
2018 (Engelska)Ingår i: 2018 IEEE CAMA Conference on Antenna Measurement and Applications CAMA 2018, 2018Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Nationell ämneskategori
Teknik och teknologier Datorsystem
Identifikatorer
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)
Konferens
2018 IEEE CAMA Conference on Antenna Measurement and Applications CAMA 2018, 02 Sep 2018, Västerås, Sweden
Projekt
ESS-H - Embedded Sensor Systems for Health Research Profile
Tillgänglig från: 2018-12-18 Skapad: 2018-12-18 Senast uppdaterad: 2018-12-20Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>Comparison of UWB Radar Back-Scattering by the Human Torso and a Phantom
2018 (Engelska)Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Nyckelord
Ultra Wide Band, Radar, Human Detection, Phantom, Mie Scattering, Complex Permittivity
Nationell ämneskategori
Teknik och teknologier Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:mdh:diva-41309 (URN)10.1109/CAMA.2018.8530483 (DOI)2-s2.0-85058273104 (Scopus ID)
Konferens
The International Conference on Antenna Measurement and Applications – 2018 IEEE CAMA
Tillgänglig från: 2018-11-09 Skapad: 2018-11-09 Senast uppdaterad: 2019-08-28Bibliografiskt granskad
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)
Öppna denna publikation i ny flik eller fönster >>Overview of microwave based diagnostics for breast tumours and strokes
2018 (Engelska)Ingår i: World Congress on Medical Physics and Biomedical Engineering IUPESM 2018, 2018, nr 1Konferensbidrag, Publicerat paper (Refereegranskat)
Nationell ämneskategori
Teknik och teknologier Datorsystem
Identifikatorer
urn:nbn:se:mdh:diva-41730 (URN)
Konferens
World Congress on Medical Physics and Biomedical Engineering IUPESM 2018, 03 Jun 2018, Prague, Czech Republic
Projekt
ESS-H - Embedded Sensor Systems for Health Research Profile
Tillgänglig från: 2018-12-18 Skapad: 2018-12-18 Senast uppdaterad: 2018-12-18Bibliografiskt granskad
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).
Öppna denna publikation i ny flik eller fönster >>Breast tumor detection with microwave applicators in open air
2017 (Engelska)Ingår i: 2017 IEEE Conference on Antenna Measurements & Applications (CAMA) CAMA 2017, 2017, s. 272-274Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Nyckelord
microwave, coil antenna, surface wave, applicator, tumor detection, diffraction, deflection, E-field probe
Nationell ämneskategori
Datorsystem
Identifikatorer
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)
Konferens
2017 IEEE Conference on Antenna Measurements & Applications (CAMA) CAMA 2017, 03 Dec 2017, Tsumuba, Japan
Projekt
ESS-H - Embedded Sensor Systems for Health Research Profile
Tillgänglig från: 2018-03-01 Skapad: 2018-03-01 Senast uppdaterad: 2018-05-11Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>Breast tumour detection by two microwave antenna principles
2017 (Engelska)Ingår i: Proceedings of the 2017 19th International Conference on Electromagnetics in Advanced Applications, ICEAA 2017, Institute of Electrical and Electronics Engineers Inc. , 2017, s. 1258-1261Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
Institute of Electrical and Electronics Engineers Inc., 2017
Nyckelord
Antennas, Surface waves, Tissue, Tumors, Antenna system, Breast tissue properties, Breast tissues, Coupling medium, Direct detection, Inhomogeneities, Performance measurement system, Transmission loss, Microwave antennas
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:mdh:diva-37414 (URN)10.1109/ICEAA.2017.8065500 (DOI)000426455500237 ()2-s2.0-85035132369 (Scopus ID)9781509044511 (ISBN)
Konferens
19th International Conference on Electromagnetics in Advanced Applications, ICEAA 2017, 11 September 2017 through 15 September 2017
Tillgänglig från: 2017-12-07 Skapad: 2017-12-07 Senast uppdaterad: 2018-03-22Bibliografiskt granskad
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) .
Öppna denna publikation i ny flik eller fönster >>QUANTIFICATION OF INHOMOGENEITIES IN OBJECTS BY ELECTROMAGNETIC FIELDS
2017 (Engelska)Patent (Övrig (populärvetenskap, debatt, mm))
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.

Ort, förlag, år, upplaga, sidor
International applikation published under the patent cooperation treatu (PCT), 2017
Nationell ämneskategori
Teknik och teknologier Datorsystem
Identifikatorer
urn:nbn:se:mdh:diva-38652 (URN)
Projekt
ESS-H - Embedded Sensor Systems for Health Research Profile
Tillgänglig från: 2018-03-01 Skapad: 2018-03-01 Senast uppdaterad: 2018-03-01Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-2118-9354

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