Experimental validation of tangential resolution improvement in photoacoustic tomography using modified delay-and-sum reconstruction algorithm
For a circular scanning geometry in photoacoustic tomography, the axial/radial resolution is spatially invariant and is not affected by the ultrasound transducer (UST, detector) aperture. However, the tangential resolution is dependent on the detector aperture size and it varies spatially. Many tech...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2016
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/82178 http://hdl.handle.net/10220/41172 |
| _version_ | 1824456628973338624 |
|---|---|
| author | Kalva, Sandeep Kumar Pramanik, Manojit |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Kalva, Sandeep Kumar Pramanik, Manojit |
| author_sort | Kalva, Sandeep Kumar |
| collection | NTU |
| description | For a circular scanning geometry in photoacoustic tomography, the axial/radial resolution is spatially invariant and is not affected by the ultrasound transducer (UST, detector) aperture. However, the tangential resolution is dependent on the detector aperture size and it varies spatially. Many techniques were proposed to improve the tangential resolution, such as attaching a concave lens in front of the nonfocused transducer or using a virtual point detector. Both of these methods have difficulties. Therefore, a modified delay-and-sum reconstruction algorithm has been proposed which can be used together with a standard ultrasound detector (nonfocused) to improve the tangential resolution. In this work, we validate the modified delay-and-sum algorithm experimentally for both flat and cylindrically focused USTs. More than threefold improvement in tangential resolution is observed. It is also shown that the object shape is recovered with this modified algorithm, which is very helpful for diagnosis and treatment purposes. |
| first_indexed | 2025-02-19T03:57:08Z |
| format | Journal Article |
| id | ntu-10356/82178 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:57:08Z |
| publishDate | 2016 |
| record_format | dspace |
| spelling | ntu-10356/821782023-12-29T06:54:34Z Experimental validation of tangential resolution improvement in photoacoustic tomography using modified delay-and-sum reconstruction algorithm Kalva, Sandeep Kumar Pramanik, Manojit School of Chemical and Biomedical Engineering Image reconstruction Tangential resolution For a circular scanning geometry in photoacoustic tomography, the axial/radial resolution is spatially invariant and is not affected by the ultrasound transducer (UST, detector) aperture. However, the tangential resolution is dependent on the detector aperture size and it varies spatially. Many techniques were proposed to improve the tangential resolution, such as attaching a concave lens in front of the nonfocused transducer or using a virtual point detector. Both of these methods have difficulties. Therefore, a modified delay-and-sum reconstruction algorithm has been proposed which can be used together with a standard ultrasound detector (nonfocused) to improve the tangential resolution. In this work, we validate the modified delay-and-sum algorithm experimentally for both flat and cylindrically focused USTs. More than threefold improvement in tangential resolution is observed. It is also shown that the object shape is recovered with this modified algorithm, which is very helpful for diagnosis and treatment purposes. MOE (Min. of Education, S’pore) Published version 2016-08-23T02:52:19Z 2019-12-06T14:48:04Z 2016-08-23T02:52:19Z 2019-12-06T14:48:04Z 2016 2016 Journal Article Kalva, S. K., & Pramanik, M. (2016). Experimental validation of tangential resolution improvement in photoacoustic tomography using modified delay-and-sum reconstruction algorithm. Journal of Biomedical Optics, 21(8), 086011-. 1083-3668 https://hdl.handle.net/10356/82178 http://hdl.handle.net/10220/41172 10.1117/1.JBO.21.8.086011 195106 en Journal of Biomedical Optics © 2016 Society of Photo-optical Instrumentation Engineers (SPIE). This paper was published in Journal of Biomedical Optics and is made available as an electronic reprint (preprint) with permission of SPIE. The published version is available at: [http://dx.doi.org/10.1117/1.JBO.21.8.086011]. 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. 8 p. application/pdf |
| spellingShingle | Image reconstruction Tangential resolution Kalva, Sandeep Kumar Pramanik, Manojit Experimental validation of tangential resolution improvement in photoacoustic tomography using modified delay-and-sum reconstruction algorithm |
| title | Experimental validation of tangential resolution improvement in photoacoustic tomography using modified delay-and-sum reconstruction algorithm |
| title_full | Experimental validation of tangential resolution improvement in photoacoustic tomography using modified delay-and-sum reconstruction algorithm |
| title_fullStr | Experimental validation of tangential resolution improvement in photoacoustic tomography using modified delay-and-sum reconstruction algorithm |
| title_full_unstemmed | Experimental validation of tangential resolution improvement in photoacoustic tomography using modified delay-and-sum reconstruction algorithm |
| title_short | Experimental validation of tangential resolution improvement in photoacoustic tomography using modified delay-and-sum reconstruction algorithm |
| title_sort | experimental validation of tangential resolution improvement in photoacoustic tomography using modified delay and sum reconstruction algorithm |
| topic | Image reconstruction Tangential resolution |
| url | https://hdl.handle.net/10356/82178 http://hdl.handle.net/10220/41172 |
| work_keys_str_mv | AT kalvasandeepkumar experimentalvalidationoftangentialresolutionimprovementinphotoacoustictomographyusingmodifieddelayandsumreconstructionalgorithm AT pramanikmanojit experimentalvalidationoftangentialresolutionimprovementinphotoacoustictomographyusingmodifieddelayandsumreconstructionalgorithm |