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Reconstruction of a sample photoacoutic (PA) image is the research focus in PA imaging system that is based on acoustic lens. Among all existing reconstruction methods, the reconstructing PA image is usually obtained by the projection of the absorption distribution which is regarded as PA signal of a sample. However, this equivalent relationship is just approximate and not accurate in theory. In this paper, the accurate relationship between the absorption coefficients of the sample placed on the object plane and its PA pressure signals focused on the image plane is successfully demonstrated. Both the integral and the extraction envelope methods are firstly proposed to reconstruct the axial PA image of an absorbent sample. The resolution of the reconstructed PA image obtained by Hilbert transform is theoretically higher than that by integral method, and the reason is explained. Different samples are chosen to experiment on the acoustic lens PA imaging system. A three-dimensional fast PA imaging of the absorbent sample is realized by combining its axial imaging capability with its lateral imaging capability of acoustic lens. The reconstruction result shows that both the lateral and the axial resolutions of the reconstruction image are both about 1 mm. The quality of a sample PA image obtained by Hilbert transform is better than that by integral method.
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Keywords:
- acoustic lens /
- photoacoustic imaging /
- integral method /
- Hilbert transform
[1] Wang L H, Hu S 2012 Science 335 1458
[2] Xing W X, Wang L D, Maslov K, Wang L H 2013 Opt. Lett. 38 52
[3] Wang Y, Li C, Wang R K 2011 Opt. Lett. 36 3975
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[6] Kruger R A, Liu P, Fang R, Appledorn C 1995 Med. Phys. 22 1605
[7] Zhou Q, Ji X, Xing D 2011 Med. Phys. 38 1561
[8] Niederhauser J J, Jaeger M, Frenz M 2004 Appl. Phys. Lett. 85 846
[9] Chen Z X, Tang Z L, Wan W, He Y H 2006 Acta Phys. Sin. 55 4365 (in Chinese) [陈湛旭, 唐志列, 万巍, 何永恒 2006 物理学报 55 4365]
[10] Heijblom M, Piras D, Xia W, Hespen J C G, Engh F M, Klaase J M, Leeuwen T G, Steenbergen W, Manohar S 2012 Proc. SPIE California, USA February 9, 2012 p116
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[1] Wang L H, Hu S 2012 Science 335 1458
[2] Xing W X, Wang L D, Maslov K, Wang L H 2013 Opt. Lett. 38 52
[3] Wang Y, Li C, Wang R K 2011 Opt. Lett. 36 3975
[4] Xu X H, Li H 2008 Acta Phys. Sin. 57 4628 (in Chinese) [徐晓辉, 李晖 2008 物理学报 57 4628]
[5] Yu X G, Tang Z L, Chen G S, Liu J L 2002 Physics 31 98 (in Chinese) [余晓光, 唐志列, 陈更生, 刘金龙 2002 物理 31 98]
[6] Kruger R A, Liu P, Fang R, Appledorn C 1995 Med. Phys. 22 1605
[7] Zhou Q, Ji X, Xing D 2011 Med. Phys. 38 1561
[8] Niederhauser J J, Jaeger M, Frenz M 2004 Appl. Phys. Lett. 85 846
[9] Chen Z X, Tang Z L, Wan W, He Y H 2006 Acta Phys. Sin. 55 4365 (in Chinese) [陈湛旭, 唐志列, 万巍, 何永恒 2006 物理学报 55 4365]
[10] Heijblom M, Piras D, Xia W, Hespen J C G, Engh F M, Klaase J M, Leeuwen T G, Steenbergen W, Manohar S 2012 Proc. SPIE California, USA February 9, 2012 p116
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