Model-based back-projection method in photoacoustic tomography for improved tangential resolution

Xiaofei Luo; Congcong Wang; Bo Wang; Jiaying Xiao

doi:10.1117/12.2537157

20 November 2019 Model-based back-projection method in photoacoustic tomography for improved tangential resolution

Xiaofei Luo, Congcong Wang, Bo Wang, Jiaying Xiao

Proceedings Volume 11190, Optics in Health Care and Biomedical Optics IX; 111901W (2019) https://doi.org/10.1117/12.2537157
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

The back-projection method is mostly used in the circular or spherical scanning based photoacoustic tomography for its computational efficiency and robustness. However, it models the transducer as a point detector, which leads to the “finite aperture” problem. To solve this, here we for the first time propose to calculate the time delay and weighting factor in the back-projection method with a forward linear model. Compared with the conventional back-projection method, our proposed method can almost completely resolve the “finite aperture effect”, which was validated with simulation and experimental results. Results also show that by improving the tangential resolution in the off-center regions, our proposed new method can provide clearer details when imaging complicated targets. However, results also imply that it’s still important to try making all the targets effectively detected at each position when scanning the transducers.

Citation Download Citation

Xiaofei Luo, Congcong Wang, Bo Wang, and Jiaying Xiao "Model-based back-projection method in photoacoustic tomography for improved tangential resolution", Proc. SPIE 11190, Optics in Health Care and Biomedical Optics IX, 111901W (20 November 2019); https://doi.org/10.1117/12.2537157

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