Source density apodisation in 2D all-optical ultrasound imaging

TY - CHAP

T1 - Source density apodisation in 2D all-optical ultrasound imaging

AU - Alles, Erwin J.

AU - Noimark, Sacha

AU - Maneas, Efthymios

AU - Xia, Wenfeng

AU - Zhang, Edward

AU - Beard, Paul C.

AU - Parkin, Ivan P.

AU - Desjardins, Adrien E.

PY - 2017/10/31

Y1 - 2017/10/31

N2 - All-optical ultrasound imaging, where ultrasound is generated photoacoustically and back-scattered fields are detected with optically resonant structures, has distinct advantages over conventional piezoelectric or capacitive transducers. An absence of electrical connections facilitates probe miniaturisation and confers MRI compatibility, while similar or better sensitivities and bandwidths can be achieved. Previously reported all-optical systems used mechanical translation of a single source and receiver to scan a synthetic aperture, resulting in image acquisition times ranging from seconds to minutes. This frame-rate can be improved by reducing the number of A-scans per image; however, this increases the noise and artefact levels of the image. For conventional probes, typically employing unalterable periodic arrays, side- and grating lobes can give rise to substantial artefacts that are commonly suppressed using amplitude-weighted apodisation. In this work, however, the spatial density of the acoustic sources rather than their amplitudes is weighted to avoid array periodicity, in order to achieve a better image quality using the same aperture and number of A-scans.

AB - All-optical ultrasound imaging, where ultrasound is generated photoacoustically and back-scattered fields are detected with optically resonant structures, has distinct advantages over conventional piezoelectric or capacitive transducers. An absence of electrical connections facilitates probe miniaturisation and confers MRI compatibility, while similar or better sensitivities and bandwidths can be achieved. Previously reported all-optical systems used mechanical translation of a single source and receiver to scan a synthetic aperture, resulting in image acquisition times ranging from seconds to minutes. This frame-rate can be improved by reducing the number of A-scans per image; however, this increases the noise and artefact levels of the image. For conventional probes, typically employing unalterable periodic arrays, side- and grating lobes can give rise to substantial artefacts that are commonly suppressed using amplitude-weighted apodisation. In this work, however, the spatial density of the acoustic sources rather than their amplitudes is weighted to avoid array periodicity, in order to achieve a better image quality using the same aperture and number of A-scans.

UR - http://www.scopus.com/inward/record.url?scp=85039442377&partnerID=8YFLogxK

U2 - 10.1109/ULTSYM.2017.8092214

DO - 10.1109/ULTSYM.2017.8092214

M3 - Conference paper

AN - SCOPUS:85039442377

BT - 2017 IEEE International Ultrasonics Symposium, IUS 2017

PB - IEEE Computer Society

T2 - 2017 IEEE International Ultrasonics Symposium, IUS 2017

Y2 - 6 September 2017 through 9 September 2017

ER -