Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/92442
Title: A robust modified delay-and-sum algorithm for photoacoustic tomography imaging with apodized sensors
Authors: Warbal, Pankaj
Pramanik, Manojit
Saha, Ratan K.
Keywords: Apodization
Engineering::Chemical engineering
Photoacoustic Tomography
Issue Date: 2019
Source: Warbal, P., Pramanik, M., & Saha, R. K. (2019). A robust modified delay-and-sum algorithm for photoacoustic tomography imaging with apodized sensors. Opto-Acoustic Methods and Applications in Biophotonics IV. doi:10.1117/12.2527025
Abstract: Role of sensor sensitivity in photoacoustic tomography (PAT) imaging is discussed. In this study, sensitivity profile (apodization) of nite 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 e ect on PAT image reconstruction. The images were reconstructed using conventional delay-and-sum (CDAS) and modi ed delay-and-sum (MDAS) algorithms. In case of the CDAS, a Gaussian function was used to weight the PA signals detected by di erent 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 di erent point locations on the aperture of the nite 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).
URI: https://hdl.handle.net/10356/92442
http://hdl.handle.net/10220/49754
DOI: http://doi.org.remotexs.ntu.edu.sg/10.1117/12.2527025
Rights: © 2019 Society of Photo-optical Instrumentation Engineers (SPIE). All rights reserved. This paper was published in Opto-Acoustic Methods and Applications in Biophotonics IV and is made available with permission of Society of Photo-optical Instrumentation Engineers (SPIE).
metadata.item.grantfulltext: open
metadata.item.fulltext: With Fulltext
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