Calibrating reconstruction radius in a multi single-element ultrasound-transducer-based photoacoustic computed tomography system
In a circular scanning photoacoustic computed tomography (PAT/PACT) system, a single-element ultrasound transducer (SUT) (rotates in full 360° around the sample) or a full-ring array transducer is used to acquire the photoacoustic (PA) data from the target object. SUT takes several minutes to acquir...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2018
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| Online Access: | https://hdl.handle.net/10356/88609 http://hdl.handle.net/10220/44706 |
| _version_ | 1826129052767879168 |
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| author | Kalva, Sandeep Kumar Hui, Zhe Zhi Pramanik, Manojit |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Kalva, Sandeep Kumar Hui, Zhe Zhi Pramanik, Manojit |
| author_sort | Kalva, Sandeep Kumar |
| collection | NTU |
| description | In a circular scanning photoacoustic computed tomography (PAT/PACT) system, a single-element ultrasound transducer (SUT) (rotates in full 360° around the sample) or a full-ring array transducer is used to acquire the photoacoustic (PA) data from the target object. SUT takes several minutes to acquire the PA data, whereas the full-ring array transducer takes only few seconds. Hence, for real-time imaging, full-ring circular array transducers are preferred. However, these are custom built, very expensive, and not available readily on the market, whereas SUTs are cheap and easily available. Thus, PACT systems can be made cost effective by using SUTs. To improve the data acquisition speed, multiple SUTs can be employed at the same time. This will reduce the acquisition time by N-fold if N numbers of SUTs are used, each rotating 360/N degrees. Experimentally, all SUTs cannot be placed exactly at the same distance from the scanning center. Hence, the acquired PA data from each transducer need to be reconstructed with their corresponding radii in a delay-and-sum reconstruction algorithm. This requires the exact location of each SUT from the scanning center. Here, we propose a calibration method to find out the distance from the scanning center at which each SUT acquires the PA data. Three numerical phantoms were used to show the efficacy of the proposed method, and later it was validated with experimental data (point source phantom). |
| first_indexed | 2024-10-01T07:34:27Z |
| format | Journal Article |
| id | ntu-10356/88609 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:34:27Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/886092023-12-29T06:52:27Z Calibrating reconstruction radius in a multi single-element ultrasound-transducer-based photoacoustic computed tomography system Kalva, Sandeep Kumar Hui, Zhe Zhi Pramanik, Manojit School of Chemical and Biomedical Engineering Image Reconstruction Techniques Photoacoustic Imaging In a circular scanning photoacoustic computed tomography (PAT/PACT) system, a single-element ultrasound transducer (SUT) (rotates in full 360° around the sample) or a full-ring array transducer is used to acquire the photoacoustic (PA) data from the target object. SUT takes several minutes to acquire the PA data, whereas the full-ring array transducer takes only few seconds. Hence, for real-time imaging, full-ring circular array transducers are preferred. However, these are custom built, very expensive, and not available readily on the market, whereas SUTs are cheap and easily available. Thus, PACT systems can be made cost effective by using SUTs. To improve the data acquisition speed, multiple SUTs can be employed at the same time. This will reduce the acquisition time by N-fold if N numbers of SUTs are used, each rotating 360/N degrees. Experimentally, all SUTs cannot be placed exactly at the same distance from the scanning center. Hence, the acquired PA data from each transducer need to be reconstructed with their corresponding radii in a delay-and-sum reconstruction algorithm. This requires the exact location of each SUT from the scanning center. Here, we propose a calibration method to find out the distance from the scanning center at which each SUT acquires the PA data. Three numerical phantoms were used to show the efficacy of the proposed method, and later it was validated with experimental data (point source phantom). National Medical Research Council (NMRC) National Research Foundation (NRF) Accepted version Singapore National Research Foundation administered by the Singapore Ministry of Health’s National Medical Research Council (NMRC/OFIRG/0005/2016: M4062012). Authors have no relevant financial interests in the manuscript and no other potential conflicts of interest to disclose. 2018-04-20T08:19:37Z 2019-12-06T17:07:11Z 2018-04-20T08:19:37Z 2019-12-06T17:07:11Z 2018 2018 Journal Article Kalva, S. K., Hui, Z. Z., & Pramanik, M. (2018). Calibrating reconstruction radius in a multi single-element ultrasound-transducer-based photoacoustic computed tomography system. Journal of the Optical Society of America A, 35(5), 764-771. 1084-7529 https://hdl.handle.net/10356/88609 http://hdl.handle.net/10220/44706 10.1364/JOSAA.35.000764 206050 206050 206050 en Journal of the Optical Society of America A © 2018 Optical Society of America (OSA). This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of the Optical Society of America A, Optical Society of America (OSA). It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1364/JOSAA.35.000764]. 8 p. application/pdf |
| spellingShingle | Image Reconstruction Techniques Photoacoustic Imaging Kalva, Sandeep Kumar Hui, Zhe Zhi Pramanik, Manojit Calibrating reconstruction radius in a multi single-element ultrasound-transducer-based photoacoustic computed tomography system |
| title | Calibrating reconstruction radius in a multi single-element ultrasound-transducer-based photoacoustic computed tomography system |
| title_full | Calibrating reconstruction radius in a multi single-element ultrasound-transducer-based photoacoustic computed tomography system |
| title_fullStr | Calibrating reconstruction radius in a multi single-element ultrasound-transducer-based photoacoustic computed tomography system |
| title_full_unstemmed | Calibrating reconstruction radius in a multi single-element ultrasound-transducer-based photoacoustic computed tomography system |
| title_short | Calibrating reconstruction radius in a multi single-element ultrasound-transducer-based photoacoustic computed tomography system |
| title_sort | calibrating reconstruction radius in a multi single element ultrasound transducer based photoacoustic computed tomography system |
| topic | Image Reconstruction Techniques Photoacoustic Imaging |
| url | https://hdl.handle.net/10356/88609 http://hdl.handle.net/10220/44706 |
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