Applicability of Capacitive Micromachined Ultrasonic Transducers for the detection of proton-induced thermoacoustic waves

Lascaud, Julie; Kalunga, Ronaldo; Lehrack, Sebastian; Wieser, Hans-Peter; Englbrecht, Franz Siegfried; Wuerl, Matthias; Assmann, Walter; Savoia, Alessandro Stuart und Parodi, Katia (2019): Applicability of Capacitive Micromachined Ultrasonic Transducers for the detection of proton-induced thermoacoustic waves. In: 2019 Ieee International Ultrasonics Symposium (Ius): S. 143-146

Abstract

This study investigates the application of broadband capacitive micromachined ultrasonic transducers (CMUT) to ionoacoustics (i.e., the thermoacoustic emissions induced by the energy deposition of ion beam) over a wide frequency range from hundreds of kHz to a few MHz. A water tank was irradiated by a 20 MeV pulsed proton beam. The frequency and amplitude of the ionoacoustic waves were modulated by adding material before to penetrate into the water tank to change the beam energy and its spatial dimensions. The measurements were performed with a 12 MHz CMUT prototype and compared to ones obtained from a commercial 3.5 MHz piezoeletric transducer as well as to in silico studies employing the k-Wave Matlab toolbox in combination with FLUKA Monte Carlo simulations to derive the dose (i.e., energy deposition per mass) and initial pressure distribution. Comparison of the experimental and in silico results show that the CMUT bandwidth is wide enough to measure the signal without any degradation or attenuation of the frequency content in the investigated frequency range, thus ensuring accurate reconstruction of the dose distribution and potential bi-modality system for the co-registration of ionoacoustic and ultrasound imaging.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin ; Physik
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit ; 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 1948-5719
• Sprache: Englisch