Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

A robust modified delay-and-sum algorithm for photoacoustic tomography imaging with apodized transducers

Not Accessible

Your library or personal account may give you access

Abstract

Role of sensor sensitivity in photoacoustic tomography (PAT) imaging is discussed. In this study, sensitivity profile (apodization) of finite size sensors was considered as axisymmetric and modelled by using a Gaussian function. The full width at half maximum (FWHM) of the Gaussian function was varied in order to investigate its effect on PAT image reconstruction. The images were reconstructed using conventional delay-and-sum (CDAS) and modified delay-and-sum (MDAS) algorithms. In case of the CDAS, a Gaussian function was used to weight the PA signals detected by different parts of the sensor and the resultant signal was computed by summing those signals. However, in case of the MDAS, the Gaussian weight was applied in both directions (signal acquisition and redistribution of the pressure values at different point locations on the aperture of the finite sensor). The performance of these algorithms was investigated with respect to ideal point detectors by conducting numerical experiments in the k-Wave toolbox. The results for the CDAS and the MDAS algorithms are found to be very close to that of ideal point detectors when FWHM is small. The MDAS technique appears to be much superior to the CDAS approach when FWHM is large. The MDAS method can be employed in practice for apodized transducers as well if the Gaussian weight is applied in both directions (signal acquisition and redistribution).

© 2019 SPIE/OSA

PDF Article
More Like This
Analytical calibration of linear transducer arrays for photoacoustic tomography

Milan Oeri, Wolfgang Bost, and Marc Fournelle
95390P European Conference on Biomedical Optics (ECBO) 2015

Image plane adjustment in photoacoustic tomography based on a full ring transducer array

Zhong Ji and Wenzheng Ding
AF2A.24 Asia Communications and Photonics Conference (ACP) 2016

Photoacoustic tomography setup using LED illumination

Jarkko Leskinen, Aki Pulkkinen, Jenni Tick, and Tanja Tarvainen
11077_25 European Conference on Biomedical Optics (ECBO) 2019

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved