Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/92442
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dc.contributor.authorWarbal, Pankajen
dc.contributor.authorPramanik, Manojiten
dc.contributor.authorSaha, Ratan K.en
dc.date.accessioned2019-08-23T01:39:10Zen
dc.date.accessioned2019-12-06T18:23:21Z-
dc.date.available2019-08-23T01:39:10Zen
dc.date.available2019-12-06T18:23:21Z-
dc.date.copyright2019-07-01en
dc.date.issued2019en
dc.identifier.citationWarbal, 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:10.1117/12.2527025en
dc.identifier.urihttps://hdl.handle.net/10356/92442-
dc.identifier.urihttp://hdl.handle.net/10220/49754en
dc.description.abstractRole 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).en
dc.format.extent9 p.en
dc.language.isoenen
dc.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).en
dc.subjectApodizationen
dc.subjectEngineering::Chemical engineeringen
dc.subjectPhotoacoustic Tomographyen
dc.titleA robust modified delay-and-sum algorithm for photoacoustic tomography imaging with apodized sensorsen
dc.typeConference Paperen
dc.contributor.schoolSchool of Chemical and Biomedical Engineeringen
dc.contributor.conferenceOpto-Acoustic Methods and Applications in Biophotonics IVen
dc.identifier.doihttp://doi.org.remotexs.ntu.edu.sg/10.1117/12.2527025en
dc.description.versionPublished versionen
dc.identifier.rims214747en
item.grantfulltextopen-
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