Partner: P. Tortoli |
Recent publications
1. | Secomski W., Nowicki A., Tortoli P.♦, Olszewski R.♦, Multigate Doppler measurements of ultrasonic attenuation and blood hematocrit in human arteries, ULTRASOUND IN MEDICINE AND BIOLOGY, ISSN: 0301-5629, DOI: 10.1016/j.ultrasmedbio.2008.08.009, Vol.35, No.2, pp.230-236, 2009 Abstract: A clinically applicable method for noninvasive measurement of hematocrit based on 20 MHz multigate Doppler ultrasound was developed. The ultrasound attenuation coefficient in blood is obtained by measuring the power of the signal coming from gates at different depths. A robust averaging method is introduced, which provides stable and repeatable results by using the echo signals from all depths inside the vessel. In vitro measurements have been done on porcine blood with hematocrit ranging from 3.0% to 65.0%. Steady and pulsatile flow conditions have been simulated using a peristaltic pump. The attenuation coefficient indicated the linear relation to hematocrit. The resulting correlation coefficient was R=0.999 for the continuous blood flow and R=0.992 for pulsatile flow. In vivo measurements have been performed in the brachial artery in 43 patients with hematocrit in the range of 32.0% to 49.3%. The mean absolute error has been 3.24% with a standard deviation of 3.72%. Keywords:blood, hematocrit, Doppler, ultrasonic attenuation Affiliations:
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2. | Secomski W., Nowicki A., Guidi F.♦, Tortoli P.♦, Lewin P.A.♦, Non-invasive measurement of blood hematocrit in artery, BULLETIN OF THE POLISH ACADEMY OF SCIENCES: TECHNICAL SCIENCES, ISSN: 0239-7528, Vol.53, No.3, pp.245-250, 2005 Abstract: Objective: hematocrit, blood, Doppler, power Doppler, multigate Doppler Affiliations:
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List of chapters in recent monographs
1. 135 | Secomski W., Nowicki A., Tortoli P.♦, Blood flow modelling and diagnostics, ABIOMED Lecture Notes 6, rozdział: Ultrasonic Doppler measurement of the attenuation, scattering and blood hematocrit in the human artery, IPPT PAN, ABIOMED (Warszawa), Kowalewski T.A. (Ed.), pp.427-438, 2005 |
Conference papers
1. | Lewandowski M., Klimonda Z., Karwat P., Sęklewski M., Nowicki A., Bassi L.♦, Tortoli P.♦, Comparison of different schemes of synthetic transmit aperture using an ultrasound advanced open platform (ULA-OP), IUS 2010, IEEE International Ultrasonics Symposium, 2010-10-11/10-14, San Diego (US), DOI: 10.1109/ULTSYM.2010.5935656, Vol.1, pp.1988-1991, 2010 Abstract: Increasing efforts are currently dedicated to incorporate the Synthetic Transmit Aperture (STA) method in ultrasound imaging systems. The STA technique can provide a pixel-like focusing (dynamic focusing at both transmit and receive) without impairment of the frame rate. This goal can only be achieved by a careful design of the transmission and reception schemes. In this paper, the preliminary results of resolution, Signal to Noise Ratio (SNR) and Contrast to Noise Ratio (CNR) measurements for a specific SA scheme with different transmit apertures are presented. The measurements were made using a novel ultrasound advanced open platform (ULA-OP) developed at the University of Florence. The ULA-OP is fully programmable and enables access to the RF echo-data from each transducer element. Keywords:synthetic aperture, ultrasound open platform Affiliations:
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