Application of the probe beam deflection technique in photoacoustic and ultrasound imaging




Barnes, Ronald

Journal Title

Journal ISSN

Volume Title



Ultrasound imaging and Photoacoustic imaging methodologies, commonly utilize piezo-electric transducers, both ceramic-based and polymer-based, to detect the acoustic energy reflected or emitted from an imaging target. Ceramic based piezo-electric transducers, exhibit non-desirable traits including: limited bandwidth (<15 MHz), off-axis energy acceptance, and requirement of a perfectly matched layer (PML), due to the large impedance mismatch to soft tissue. Polymer based piezo-electric transducers such as PVDF, exhibit high bandwidth (up to 100 MHz), however exhibit low coupling efficiency (<0.2). An optical sensing method known as the Probe Beam Deflection Technique (PBDT), is applied to ultrasound and photoacoustic imaging, to detect the acoustic reflection/emission in ultrasound and photoacoustic imaging. It is shown that the PBDT exhibits: high bandwidth (>30 MHz), acoustic propagation directionality quantification, passive sensing, high coupling efficiency (>0.5) and impedance similar to soft tissue. A series of 2-D and 3-D ultrasound images are reconstructed utilizing the PBDT and compared to images reconstructed from piezo-electric transducers. It is shown that artifact reduction and improved contrast are exhibited by the PBDT.


This item is available only to currently enrolled UTSA students, faculty or staff. To download, navigate to Log In in the top right-hand corner of this screen, then select Log in with my UTSA ID.


Imaging artifacts, Laser deflection, Off-axis ultrasound, Photoacoustic imaging, Ultrsound imaging, Ultrasound transducers



Electrical and Computer Engineering