Prof. Tadeusz Powałowski, Ph.D., Dr. Habil., Eng.


Doctoral thesis
1977Pomiar przepływu cieczy ultradźwiękową dooplerowską metodą fali ciągłej 
supervisor -- Prof. Leszek Filipczyński, Ph.D., Dr. Habil., Eng., IPPT PAN
286 
Habilitation thesis
1989Ultradźwiękowe metody wyznaczania parametrów dynamicznych układu naczyniowego pod kątem diagnostyki tętnic szyjnych 
Professor
2001-10-16Title of professor
Supervision of doctoral theses
1.2000Trawiński Zbigniew  Badanie elastyczności i wejściowej impedancji w układzie naczyniowym człowieka na podstawie pomiarów ultradźwiękowych 

Recent publications
1.Trawiński Z., Powałowski T., Wójcik J., Gutkiewicz P., Ultrasonic non-invasive method for relative changes measurements of IMT in common carotid artery wall, ACTA PHYSICA POLONICA A, ISSN: 0587-4246, DOI: 10.12693/APhysPolA.114.A-243, Vol.114, pp.A241-A246, 2008
Abstract:

The aim of this paper is to present the new method for relative changes measurements of intima-media thickness in the common carotid artery wall. The numerical solver was created for calculation of the fields of ultrasonic beams and scattered fields under different boundary conditions and different angles of penetration of ultrasonic beams with respect to the position of the arterial wall. The cylindrical model of the artery was changing the radius and thickness of the wall under cyclic variation of blood pressure. The presented method was verified on a pipe made of latex. The paper describes also the initial results of examinations of the intima-media thickness. The good agreement for the angle dependence and the perpendicular ultrasonic beam displacement from the longitudinal axis of the artery segment between the numerical calculation and experimental results was obtained for different artery diameters.

Affiliations:
Trawiński Z.-IPPT PAN
Powałowski T.-IPPT PAN
Wójcik J.-IPPT PAN
Gutkiewicz P.-IPPT PAN
2.Trawiński Z., Wójcik J., Powałowski T., Gutkiewicz P., Ultrasonic Non-Invasive Method for Relative Changes Measurements of Intima-Media Thickness in Artery Walls, ACTA PHYSICA POLONICA A, ISSN: 0587-4246, Vol.114, No.6-A, pp.A-243-247, 2008
3.Wójcik J., Powałowski T., Trawiński Z., Numerical simulation and experimental results of ultrasonic waves scattering on a model of the artery, EUROPEAN PHYSICAL JOURNAL SPECIAL TOPICS, ISSN: 1951-6355, DOI: 10.1140/epjst/e2008-00554-9, Vol.154, pp.249-252, 2008
Abstract:

The aim of this paper is to compare the results of the mathematical modeling and experimental results of the ultrasonic waves scattering in the inhomogeneous dissipative medium. The research was carried out for an artery model (a pipe made of a latex), with internal diameter of 5 mm and wall thickness of 1.25 mm. The numerical solver was created for calculation of the fields of ultrasonic beams and scattered fields under different boundary conditions, different angles and transversal displacement of ultrasonic beams with respect to the position of the arterial wall. The investigations employed the VED ultrasonic apparatus. The good agreement between the numerical calculation and experimental results was obtained.

Keywords:

Model of the artery, scattering, numerical solver

Affiliations:
Wójcik J.-IPPT PAN
Powałowski T.-IPPT PAN
Trawiński Z.-IPPT PAN
4.Wójcik J., Trawiński Z., Powałowski T., Comparison of experimental results and numerical calculations of ultrasonic waves scattering on a model of the artery, HYDROACOUSTICS, ISSN: 1642-1817, Vol.11, pp.449-458, 2008
Abstract:

The aim of this paper is to compare the results of the mathematical modeling and experimental results of the ultrasonic waves scattering in the inhomogeneous dissipative medium. The research was carried out for an artery model (a pipe made of a latex), with internal diameter of 3, 5 and 8 mm and wall thickness of 0.75, 1.25 and 2 mm. The numerical solver was created for calculation of the fields of ultrasonic beams and scattered fields under different boundary conditions, different angles and transversal displacement of ultrasonic beams with respect to the position of the arterial wall. The investigations employed the VED ultrasonic apparatus. The frequency of the transmitted ultrasound was 6.75 MHz. The good agreement between the numerical calculation and experimental results was obtained. The numerical solver is used for verified proposed methods for determining of the IMT in the artery walls.

Keywords:

ultrasound, scatering, artery model, numerical calculations, eksperimental results, Comparison

Affiliations:
Wójcik J.-IPPT PAN
Trawiński Z.-IPPT PAN
Powałowski T.-IPPT PAN
5.Powałowski T., Trawiński Z., Gutkiewicz P., Ultrasonic examinations of IMT changes in common carotid artery wall, ARCHIVES OF ACOUSTICS, ISSN: 0137-5075, Vol.32, No.4, pp.135-141, 2007
Abstract:

The paper describes the initial results of examinations of the intima-media thickness (IMT) in the common carotid artery wall. The examinations of the IMT enable the assessment of elastic properties of the arterial wall. Ultrasonic examinations were carried out on healthy volunteers with the use the apparatus Vascular Echo Doppler (VED), designed by the authors to measure the elasticity of arteries. Application of the PDA-14 PC-card (Signatec) allowed for the acquisition of ultrasonic RF signal from the output of the apparatus VED and further analysis of dynamic changes of the IMT during a heart cycle. Changing of the IMT in time as a difference between the instantaneous position of the two tracking slopes of RF echoes was obtained. For this purpose, the zero-crossing method for tracking the phase changes of the two rising slopes of the RF ultrasonic echo was used.

Keywords:

ultrasound, common carotid artery, elasticity, intima-media thickness

Affiliations:
Powałowski T.-IPPT PAN
Trawiński Z.-IPPT PAN
Gutkiewicz P.-IPPT PAN
6.Powałowski T., Wójcik J., Trawiński Z., Modelling of examinations of artery wall thickness changes, ARCHIVES OF ACOUSTICS, ISSN: 0137-5075, Vol.32, pp.851-858, 2007
Abstract:

The developed solver of acoustic field was used for simulation of the artery wall thickness examination. It is capable of describing spatial and time-dependent distribution of an ultrasonic beam, that is emitted by a piezoelectric ring transducer and then backscattered on cylindrical surfaces of the walls in artery models. The electrical signal received corresponds closely with the actual RF signal that is obtained during measurements at the output of the ultrasonicVED apparatus. The theoretical model of the artery for creating the ultrasonic reflected echoes was used. The internal radius of the artery model was 3mm for the diastolic pressure and 3.3mm for the systolic pressure. The intima- media thicknes (IMT) of the artery wall was changed from 0.48mm to 0.44mm respectively. The echoes-tracking solver based on the zero-crossing and correlation methods was used for detecting changes of the IMT.

Keywords:

ultrasound, common carotid artery, elasticity, intima-media thickness, numerical solver

Affiliations:
Powałowski T.-IPPT PAN
Wójcik J.-IPPT PAN
Trawiński Z.-IPPT PAN
7.Wójcik J., Powałowski T., Trawiński Z., Numerical analyze and experimental results of ultrasonic waves scattering on a model of the artery, MOLECULAR AND QUANTUM ACOUSTICS. ANNUAL JOURNAL, ISSN: 0208-5151, Vol.28, pp.279-283, 2007
8.Powałowski T., Wójcik J., Trawiński Z., Numerical solver of acoustic field in simulation of artery wall thickness examinations, HYDROACOUSTICS, ISSN: 1642-1817, Vol.10, pp.123-168, 2007
Abstract:

The aim of the study was the elaboration of a mathematical model to describe the process of acoustic wave propagation, generated by an ultrasonic probe in a inhomogenous loosing medium. Numerical calculations make it possible to define waveforms for electric signals that are generated when ultrasonic waves, being reflected and backscattered by an artery model, are then received by the ultrasonic probe. It is the signal that pretty well corresponds with the actual RF signal that is obtained during measurements at the output of anultrasonic apparatus. The developed solver of acoustic field was used for simulation of the artery wall tickness examination. The theoretical model of the atrery for the creating the simulated ultrasonic reflected echoes was used. The internal radiusof the artery model was 3mm for the diastolic pressure and and 3.3mm for the systolic pressure. The intima-media thicknes (IMT) of the artery wall was changed from o.48 to 0.44 respectively. The solver based on zero-crossing method was used for detecting changes of the IMT.

Keywords:

ultrasound, mathematical model, scatering, inhomogenous loosing medium, numerical simulations, intima-media changes

Affiliations:
Powałowski T.-IPPT PAN
Wójcik J.-IPPT PAN
Trawiński Z.-IPPT PAN
9.Trawiński Z., Powałowski T., Modeling and ultrasonic examination of common carotid artery thickness changes, ARCHIVES OF ACOUSTICS, ISSN: 0137-5075, Vol.31, pp.29-34, 2006
Abstract:

The paper describes the initial results of numeric analysis of plane-strain of a model of the human common carotid artery. The results of computer modeling were compared with the experimental data obtained by means of ultrasonic measurements of the changes in the thickness of the common carotid artery wall. The ultrasonic examination was carried out on a 34 years old healthy male using the VED apparatus designed by the authors to measure the elasticity of arteries. The numeric analysis was made by means of the finite element method (FEM) using the MARC K7 programming of the Analysis Research Corporation based on the operating system UNIX. As a model of the common carotid artery the authors used a hollow cylinder made of the isotropic, homogeneous, almost incompressible material (Poisson’s constant ν=0.4999) having the Young’s module E=159.2 kPa and the combined thickness of the internal and middle layer IMT = 0.52 mm. The modeling of plane-strain concerned the effect of the change in the internal radius and the change in the cylinder wall thickness as a result of the static change of pressure inside the cylinder within the values of 0–45 mmHg. The study obtained satisfactory results in the computer simulation of the changes in the artery walls thickness.

Keywords:

ultrasound, elasticity of the common carotid artery wall, wall thickness

Affiliations:
Trawiński Z.-IPPT PAN
Powałowski T.-IPPT PAN
10.Wójcik J., Powałowski T., Tymkiewicz R., Lamers A., Trawiński Z., Scattering of ultrasonic wave on a model of the artery, ARCHIVES OF ACOUSTICS, ISSN: 0137-5075, Vol.31, pp.471-479, 2006
Abstract:

The study was aimed at elaboration of a mathematical model to describe the process of acoustic wave propagation in an inhomogeneous and absorbing medium, whereas the wave is generated by an ultrasonic probe. The modelling proces covered the phenomenon of ultrasonic wave backscattering on an elastic pipe with dimensions similar to the artery section. Later on the numerical codes were determined in order to calculate the fields of ultrasonic waves, as well as backscattered fields for various boundary conditions. Numerical calculations make it possible to definethe waveforms for electric signals that are produced when ultrasonic waves, being reflected and backsvattered by an artery model, are then received by the ultrasonic probe. It is the signalwhich pretty well corresponds with the actual RF signal that is obtained during measurements at the output of anultrasonic apparatus.

Keywords:

ultrasound, backscattering, artery, numerical model

Affiliations:
Wójcik J.-IPPT PAN
Powałowski T.-IPPT PAN
Tymkiewicz R.-IPPT PAN
Lamers A.-other affiliation
Trawiński Z.-IPPT PAN
11.Czarkowski M., Hilgertner L., Powałowski T., Radomski D., Mikulska M., Is the resistance of large conduit arteries also decreased in thyrotoxic patients with Graves’ disease?, THYROID, ISSN: 1050-7256, Vol.15, No.4, pp.377-381, 2005
12.Czarkowski M., Hilgertner L., Powałowski T., Radomski D., U chorych z nadczynnością tarczycy w przebiegu choroby Graves’-Basedowa wielkość przepływu krwi zależy od stopnia nasilenia nadczynności tarczycy, POLSKI MERKURIUSZ LEKARSKI, ISSN: 1426-9686, Vol.XVIII, No.108, pp.667-670, 2005
13.Powałowski T., Ultradźwiękowe metody wyznaczania parametrów hemodynamicznych układu naczyniowego pod kątem diagnostyki tętnic szyjnych (Praca habilitacyjna), Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.36, pp.1-112, 1988
14.Nowicki A., Borodziński K., Powałowski T., Impulsowy dopplerowski miernik przepływu krwi, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.72, pp.1-9, 1974
15.Powałowski T., Borodziński K., Nowicki A., Ocena pomiaru przepływu ciągłą metodą dopplerowską, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.72, pp.11-22, 1974
16.Borodziński K., Filipczyński L., Nowicki A., Powałowski T., Badania prędkości przepływu ultradźwiękową metodą wykorzystującą zjawisko Dopplera, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.40, pp.1-16, 1972
17.Filipczyński L., Nowicki A., Powałowski T., Kretowicz J., Starzyńska J., Badanie wpływu ultradźwięków promieniowanych przez detektor tętna na chromosomy człowieka w hodowli limfocytów, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.46, pp.1-24, 1972
18.Etienne J., Filipczyński L., Nowicki A., Powałowski T., Ultradźwiękowa metoda badania tętna na zasadzie zjawiska Dopplera, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.51, pp.1-17, 1970

Patents
Numer/data zgłoszenia patentowego
Ogłoszenie o zgłoszeniu patentowym
Twórca / twórcy
Tytuł
Kraj i Nazwa uprawnionego z patentu
Numer patentu
Ogłoszenie o udzieleniu patentu
pdf
206955
1978-05-20
-
1983-03-15
Etienne J., Filipczyński L., Nowicki A., Powałowski T.
Ultradźwiękowe urządzenie dopplerowskie zwłaszcza do pomiaru przepływu krwi
PL, Instytut Podstawowych Problemów Techniki PAN
117416
-
1980-01-28
162550
1973-05-15
-
1975-04-01
Borodziński K., Etienne J., Nowicki A., Powałowski T.
Ultradźwiękowy sposób i urządzenie do badania tętna płodu z wykorzystaniem zjawiska Dopplera
PL, Instytut Podstawowych Problemów Techniki PAN
89237
-
1977-06-20