Wieloczęstotliwościowa termografia mikrofalowa

• Autorzy: Stec, B. , Dobrowolski, A.

Warianty tytułu

EN

Multifrequency microwave thermography

• Języki publikacji: PL

Abstrakty

PL

Artykuł prezentuje problematykę związaną z promieniowaniem termicznym ciał rzeczywistych w zakresie mikrofalowym oraz opis własności transmisyjnych tkanek biologicznych rozpatrywanych w aspekcie diagnozowania nowotworu złośliwego sutka. Przedstawiono opis matematyczny transmisji niejednorodnej płaskiej fali elektromagnetycznej przez model warstwowy tkanki oraz opisano istotę pomiarów temperatury i głębokości położenia ogniska za pomocą wieloczęstotliwościowego termografu mikrofalowego.

EN

This paper analyses the possibility of application of multifrequency microwave thermography to diagnose of higher fever affection of small area in variable diseases. In contrast to infrared thermography, which enables us to measure temperature on the surface exclusively, microwave thermography makes it possible to detect thermal heterogeneity inside the tissues. Microwave thermograph is a device consisting of a microwave radiometer and computer block of visual information. Radiometer enables measurement of body thermal radiation research, which gives information about its absolute temperature. The block of visual information carries out digital processing of results off measurement and shows the spatial distribution of temperature inside the research tissue. The paper presents the issue of real substance thermal radiation of microwave, and the description of tissues transmitting ability, which, due to lack of magnetic property, can be considered as dielectric loss. The analysis of thermal radiation transmission is carried out on the basis of tissue - in - layers model, consisting of three homogeneous layers, which stand for: breast, fat and skin. Another inner areas, such as blood vessels and the problems of heat diffusion, are neglected here. All layers are assumed to be isothermal, with the exception of a small area located on the model's bottom, which temperature ia s few degrees higher than the temperature of its surrounding. The area bordering surface emits an additional flux of energy towards half - space, which is damped and refracted twice, while passing through respective layers, before it reaches the aperture of thermograph receiving antenna. The length of waves used in microwave thermography ( 1 m - 3 cm ) exceeds considerably the dimension of most cells, which makes it possible to analyse equally the entire range of frequency. In conclusion of the paper there are presented the reverse transformation the results of measurement to spatial distribution of temperature inside the tissue.

Słowa kluczowe

PL

termograf mikrofalowy; radiometr; promieniowanie termiczne

EN

microwave thermograph; radiometer; thermal radiation

• Czasopismo: Kwartalnik Elektroniki i Telekomunikacji
• Rocznik: 1999
• Tom: Vol. 45, nr 2
• Strony: 225-233
• Opis fizyczny: Bibliogr. 8 poz.

Twórcy

autor

Stec, B.

autor

Dobrowolski, A.

• Wydział Elektroniki Wojskowej Akademii Technicznej w Warszawie