Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/102049
Title: Improving tangential resolution with a modified delay-and-sum reconstruction algorithm in photoacoustic and thermoacoustic tomography
Authors: Pramanik, Manojit
Keywords: DRNTU::Science::Biological sciences::Biomathematics
Issue Date: 2014
Source: Pramanik, M. (2014). Improving tangential resolution with a modified delay-and-sum reconstruction algorithm in photoacoustic and thermoacoustic tomography. Journal of the Optical Society of America A: Optics Image Science and Vision, 31(3), 621-627.
Series/Report no.: Journal of the optical society of america A : optics image science and vision
Abstract: Spatial resolution in photoacoustic and thermoacoustic tomography is ultrasound transducer (detector) bandwidth limited. For a circular scanning geometry the axial (radial) resolution is not affected by the detector aperture, but the tangential (lateral) resolution is highly dependent on the aperture size, and it is also spatially varying (depending on the location relative to the scanning center). Several approaches have been reported to counter this problem by physically attaching a negative acoustic lens in front of the nonfocused transducer or by using virtual point detectors. Here, we have implemented a modified delay-and-sum reconstruction method, which takes into account the large aperture of the detector, leading to more than fivefold improvement in the tangential resolution in photoacoustic (and thermoacoustic) tomography. Three different types of numerical phantoms were used to validate our reconstruction method. It is also shown that we were able to preserve the shape of the reconstructed objects with the modified algorithm.
URI: https://hdl.handle.net/10356/102049
http://hdl.handle.net/10220/18861
DOI: 10.1364/JOSAA.31.000621
Schools: School of Chemical and Biomedical Engineering 
Rights: © 2014 Optical Society of America. This paper was published in Journal of the Optical Society of America A: Optics Image Science and Vision and is made available as an electronic reprint (preprint) with permission of Optical Society of America. The paper can be found at the following official DOI: [http://dx.doi.org/10.1364/JOSAA.31.000621]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Journal Articles

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