Publication Details
Broadband all-optical plane-wave ultrasound imaging system based on a Fabry-Perot scanner
NOIMARK, S.
HUYNH, N.
ZHANG, E.
Kukliš Filip, Ing.
Jaroš Jiří, doc. Ing., Ph.D. (DCSY)
DESJARDINS, A.
Cox Ben
BEARD, P.
Photoacoustic imaging, Fabry-Perot scaner, 3D image reconstruction
A broadband all-optical plane-wave ultrasound imaging system for high-resolution
3D imaging of biological tissues is presented. The system is based on the planar
Fabry-Perot (FP) scanner for ultrasound detection and the photoacoustic
generation of ultrasound in a Carbon-Nanotube-Polydimethylsiloxane (CNT-PDMS)
composite film. The FP sensor head was coated with the CNT-PDMS film to act as an
ultrasound transmitting layer for pulse-echo imaging. Exciting the CNT-PDMS
coating with nanosecond laser pulses generated monopolar plane-wave ultrasound
pulses with MPa-range peak pressures, and a -6dB bandwidth of 22 MHz, that were
transmitted into the target. The resulting scattered acoustic field was detected
across a 15 mm × 15 mm scan area with a step size of 100 m and an optically
defined element size of 64 m. The -3dB bandwidth of the sensor was 30 MHz. A 3D
image of the scatterer distribution was then recovered using a k-space
reconstruction algorithm. To obtain a measure of spatial resolution, the
instrument line-spread function (LSF) was measured as a function of position. At
the centre of the scan area the depth dependent lateral LSF ranged from 46 to 65
m for depths between 1 and 12 mm. The vertical LSF was independent of position
and measured to be 44 m over the entire field of view. To demonstrate the ability
of the system to provide high-resolution 3D images, phantoms with well-defined
scattering structures of arbitrary geometry were imaged. To demonstrate its
suitability for imaging biological tissues, phantoms with similar impedance
mismatches, sound speed and scattering properties to those present in tissue, and
ex-vivo tissue samples were imaged. Compared to conventional piezoelectric based
ultrasound scanners this approach offers the potential for improved image quality
and higher resolution for superficial tissue imaging. Since the FP scanner is
capable of high-resolution 3D photoacoustic imaging of in-vivo biological
tissues, the system could ultimately be developed into an instrument for
dual-mode all-optical ultrasound and photoacoustic imaging.
@article{BUT168167,
author="PHAM, K. and NOIMARK, S. and HUYNH, N. and ZHANG, E. and KUKLIŠ, F. and JAROŠ, J. and DESJARDINS, A. and COX, B. and BEARD, P.",
title="Broadband all-optical plane-wave ultrasound imaging system based on a Fabry-Perot scanner",
journal="IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL",
year="2021",
volume="68",
number="4",
pages="1007--1016",
doi="10.1109/TUFFC.2020.3028749",
issn="1525-8955",
url="https://pubmed.ncbi.nlm.nih.gov/33035154/"
}