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Article Dans Une Revue IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control Année : 2003

Simulations and measurements of optical images of insonified ultrasound contrast microbubbles

Résumé

Ultrasound contrast agents (UCAs) are used in a clinical setting to enhance the backscattered signal from the blood pool to estimate perfusion and blood flow. The UCAs consist of encapsulated microbubbles, measuring 1-10 µm in diameter. Acoustic characterization of UCAs is generally carried out from an ensemble of bubbles. The measured signal is a complicated summation of all signals from the individual microbubbles. Hence, characterization of a single bubble from acoustic measurements is complex. In this study, 583 optical observations of freely flowing, oscillating, individual microbubbles from an experimental UCA were analyzed. The excursions during ultrasound exposure were observed through a microscope. Images were recorded with a high frame rate camera operating at 3 MHz. Microbubbles on these images were measured off-line and maximal excursions were determined. A technique is described to determine the diameters of the bubbles observed. We compared the maximal excursions of microbubbles of the same initial size in an ultrasound field with a 500 kHz center frequency at acoustic amplitudes ranging from 0.06 MPa to 0.85 MPa. It was concluded that maximal excursions of identical bubbles can differ by 150% at low acoustic pressures (mechanical index or MI < 0.2). At a high acoustic pressure (MI = 1.2) an image sequence was recorded on which a bubble collapsed, while an apparently identical bubble survived.
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Dates et versions

hal-03193417 , version 1 (13-04-2021)

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Michiel Postema, Ayache Bouakaz, Chien Ting Chin, Nico de Jong. Simulations and measurements of optical images of insonified ultrasound contrast microbubbles. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2003, 50 (5), pp.523-536. ⟨10.1109/TUFFC.2003.1201465⟩. ⟨hal-03193417⟩
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