850-nm near-infrared-ray computed tomography with high spatial resolutions

Eiichi Sato; Yasuyuki Oda; Yuichi Sato; Sohei Yoshida; Hodaka Moriyama; Manabu Watanabe

doi:10.1117/12.2526543

19 July 2019 850-nm near-infrared-ray computed tomography with high spatial resolutions

Eiichi Sato, Yasuyuki Oda, Yuichi Sato, Sohei Yoshida, Hodaka Moriyama, Manabu Watanabe

Proceedings Volume 11073, Clinical and Preclinical Optical Diagnostics II; 110730N (2019) https://doi.org/10.1117/12.2526543
Event: European Conferences on Biomedical Optics, 2019, Munich, Germany

Abstract

To improve the spatial resolution in near-infrared-ray computed tomography (NIR-CT), a first-generation scanner in the first-living-body window was constructed. The NIR photons are produced from an 850 nm laser module, and penetrating photons from an object are detected using a photodiode (PD). To improve the spatial resolution, we used a 1.0-mm-diam graphite pinhole and a 1.0-mm-diam 5.0-mm-length graphite collimator. To detect the penetrating photons, the pinhole is set behind the object, and the collimator is attached to the PD to improve the spatial resolution. The NIR-CT is accomplished by repeated translations and rotations of the object. The translation is performed by the object moving between the laser and the PD modules. The translation and rotation steps were 0.25 mm and 1.0°, respectively, and the spatial resolutions were determined as 1.0×1.0 mm². The scanning time and the total rotation angle for CT were 9.8 min and 180°, respectively.

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Eiichi Sato, Yasuyuki Oda, Yuichi Sato, Sohei Yoshida, Hodaka Moriyama, and Manabu Watanabe "850-nm near-infrared-ray computed tomography with high spatial resolutions", Proc. SPIE 11073, Clinical and Preclinical Optical Diagnostics II, 110730N (19 July 2019); https://doi.org/10.1117/12.2526543

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KEYWORDS

Spatial resolution

Photons

Computed tomography

Near infrared

Scanners

Collimators

3D scanning

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