Open AccessAssessment of ultrasonic properties of an agarose phantom at the frequency range 2.25 MHz to 10 MHz
Author(s) -
Mylena Kathleen Mosqueira de Assis,
R. M. Souza,
R P B Costa-Félix,
André Victor Alvarenga
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1826/1/012005
Subject(s) - repeatability , imaging phantom , attenuation , ultrasonic sensor , acoustics , materials science , metrology , range (aeronautics) , physics , statistics , mathematics , optics , composite material
Agarose-based phantoms are widely used to evaluate ultrasonic equipment used for diagnosis. Many studies report phantom’s ultrasonic characteristics as a function of frequency, mainly sound velocity and attenuation, but a metrological approach is not widely spread. The current paper reports attenuation coefficient (Att-c) and speed of sound (SoS) in an agarose-based phantom as a function of the diagnostically used frequency, ranging from 2.25 MHz to 10 MHz, at 21 °C. The pulse-echo method was applied to measure the ultrasonic properties. The measurements were performed under repeatability conditions (no = 4) and the expanded uncertainties of the measurements were estimated thereafter. It was observed that there was no statistical difference among the values of SoS (average of 1,540.3 m s- 1 ) for all frequencies, in which the maximum E n = 0.98. The SoS result with the highest uncertainty was of 1,538.7 m s- 1 ± 3.8 m s- 1 ( k = 2; coverage probability p = 0.95). Att-c increases as a power function of frequency (Att-c = f 109 ; α 0 = 0.573; R 2 = 0.9995. A survey of the literature was made and it was found that Att-c values obtained in this research are consistent with the previously reported. Based on the SoS, this study draws attention to the importance of performing a statistical test to assess the consistency of the results.