Archives of Acoustics, 45, 2, pp. 329–339, 2020
10.24425/aoa.2020.133153

Analysis for Improvement of Doppler Tomography Imaging of Objects Scattering Continuous Ultrasonic Waves

Tomasz ŚWIETLIK
Wroclaw University of Science and Technology ­
Poland

Krzysztof J. OPIELINSKI
Wroclaw University of Science and Technology ­
Poland

The paper describes an innovative ultrasound imaging method called Doppler Tomography (DT), otherwise known as Continuous Wave Ultrasonic Tomography (CWUT). Thanks to this method, it is possible to image the tissue cross-section in vivo using a simple two-transducer ultrasonic probe and using the Doppler effect. It should be noted that DT significantly differs from the conventional ultrasound Doppler method of measuring blood flow velocity. The main difference is that when measuring blood flow, we receive information with an image of the velocity distribution in a given blood vessel (Nowicki, 1995), while DT allows us to obtain a cross-sectional image of stationary tissue structure. In the conventional method, the probe remains stationary, while in the DT method, the probe moves and the examined tissue remains stationary. This paper presents a method of image reconstruction using the DT method. First, the basic principle of correlation of generated Doppler frequencies with the location of inclusions from which they originate is explained. Then the exact process and algorithm in this method are presented. Finally, the impact of several key parameters on imaging quality is examined. As a result, the conclusions of the research allow to improve the image reconstruction process using the DT method.
Keywords: continuous wave ultrasonic tomography; Doppler tomography; image reconstruction
Full Text: PDF

References

Liang H.-D., Halliwell M., Wells P.N.T. (2001), Continuous wave ultrasonic tomography, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 48(1): 285–292, doi: 10.1109/58.896141.

Liang H.-D., Tsui Ch.S.L., Halliwell M., Wells P.N.T. (2011), Continuous wave ultrasonic Doppler tomography, Interface Focus, 1(4): 665–672, doi: 10.1098/rsfs.2011.0018.

Kak A.C., Slaney M. (1988), Principles of Computerized Tomographic Imaging, IEEE Press, New York.

Świetlik T., Opieliński K.J. (2016), The use of Doppler effect for tomographic tissue imaging with omnidirectional acoustic data acquisition, [in:] Pietka E. et al. [Eds], Information technologies in medicine. Advances in intelligent systems and computing, Springer International Publishing, Switzerland, 471: 219–230, doi: 10.1007/978-3-319-39796-2_18.

Świetlik T., Opieliński K.J. (2019), Analysis of the possibility of Doppler tomography imaging in circular geometry, [in:] Pietka E. et al. [Eds], Information technologies in medicine. Advances in intelligent systems and computing, Springer International Publishing, Switzerland, 762: 52–63, doi: 10.1007/978-3-319-91211-0_5.

Nowicki A. (1995), Fundamentals of Doppler ultrasonography [in Polish: Podstawy ultrasonografii dopplerowskiej ], Wydawnictwo Naukowe PWN, Warszawa.

Opieliński K.J., Gudra T. (2010), Ultrasonic transmission tomography, [in:] Industrial and biological tomography – theoretical basis and application, J. Sikora, S. Wójtowicz [Eds], Warsaw, Electrotechnical Institute.




DOI: 10.24425/aoa.2020.133153

Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN)