Minimization of artifacts due to surface effects in laser CT images reconstructed by FBP method

Yuuki Watanabe; Tetsuya Yuasa; Balasigamani Devaraj; Takao Akatsuka; Humio Inaba

doi:10.1117/12.347481

30 April 1999 Minimization of artifacts due to surface effects in laser CT images reconstructed by FBP method

Yuuki Watanabe, Tetsuya Yuasa, Balasigamani Devaraj, Takao Akatsuka, Humio Inaba

Proceedings Volume 3598, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications III; (1999) https://doi.org/10.1117/12.347481
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States

Abstract

Optical tomography for biomedical target is an evolving research area with emerging potential applications. In transillumination optical tomography, the filtered back projection (FBP) method is generally used for image reconstruction and the images represent a distribution of the optical attenuation coefficient. However, in practical optical imaging systems, refractive index mismatch at boundaries, such as the tissue surface, strongly affects optical attenuation. The surface effects are not constant even at the same part of the sample at different incident angles. Therefore, the surface effects introduce artifacts that obscure the internal structure and functional information in the laser CT images reconstructed by the FBP method. In this paper, we propose a simple correction method that could minimize the surface effects in laser CT images. The experiments were performed with the coherent detection imaging system based on the optical heterodyne detection technique. Experimentally determined attenuation coefficient corresponding to different incident angles was used to correct the surface effects. Improved target structures were demonstrated in the reconstructed laser CT images. Our correction method for laser CT image reconstruction is quite effective for visualizing internal structures with small variations in attenuation coefficients that would otherwise be masked by the dominant surface attenuation.

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Yuuki Watanabe, Tetsuya Yuasa, Balasigamani Devaraj, Takao Akatsuka, and Humio Inaba "Minimization of artifacts due to surface effects in laser CT images reconstructed by FBP method", Proc. SPIE 3598, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications III, (30 April 1999); https://doi.org/10.1117/12.347481

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KEYWORDS

Laser cutting

Signal attenuation

Computed tomography

Natural surfaces

Tissue optics

Laser scattering

Photons

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