Near-infrared-ray computed tomography with 850-nm peak and high spatial resolutions in first living-body window

Satô, Eiichi; Yoshida, Akiko; Someya, Toshihiro; Oda, Y.; Yoshida, Sohei; Yoshioka, Kunihiro; Sato, Yuichi; Moriyama, Hodaka; Watanabe, Manabu

doi:10.1016/j.physo.2019.100010

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…[1][2][3][4] Using the PCCT scanners, we performed K-edge CT using iodine (I) and gadolinium (Gd) contrast media, since photons with energies just beyond the K-edge energy are absorbed effectively by the contrast media. Recently, we developed a near-infrared-ray computed tomography (NIRCT) scanners [5][6][7] in the living-body range of 700-900 nm to observe thick blood vessels. However, the NIR photons did not easily penetrate muscles, and it was not easy to image blood vessels.…”

Section: Introductionmentioning

confidence: 99%

Red-ray computed tomography with high spatial resolutions

Hagiwara,

Sato,

Ito

et al. 2023

Applications of Digital Image Processing XLVI

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To image blood vessels, we performed fundamental experiments of a red-ray computed tomography (RRCT) scanner using 650-nm-laser and high-sensitivity-photodiode (PD) modules. The line laser beam is irradiated to an object, and the photons penetrating through the object are detected using the PD module through a 1.0-mm-diameter graphite pinhole and a 0.7-mm-diameter 5-mm-length graphite collimator for the PD. The spatial resolutions were primarily determined by the collimator diameter for the PD and were approximately 0.7×0.7 mm2. RRCT was performed by repeating the reciprocating translations and rotations of the object, and the ray-sampling-translation and rotation steps were 0.1 mm and 0.5°, respectively. The image contrast was regulated using the digital amplifier, and the visible diameter of object was 0.5mm.

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Section: Introductionmentioning

confidence: 99%

Red-ray computed tomography with high spatial resolutions

Hagiwara,

Sato,

Ito

et al. 2023

Applications of Digital Image Processing XLVI

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Near-infrared-ray computed tomography with an 808 nm laser beam and high spatial resolutions

Satô

Oda

Yoshida

et al. 2021

Review of Scientific Instruments

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To increase the penetrating photons and to improve the spatial resolution in near-infrared-ray computed tomography (NIR-CT), we used an 808 nm laser module. The NIR photons are produced from the laser module, and an object is exposed to the laser beam. The laser power is controlled by the applied voltage, and the photodiode detects photons penetrating through the object. To reduce scattering photons from the object, a 1.0-mm-diameter graphite pinhole is set behind the object. The spatial resolutions were improved using a 1.0-mm-diameter 5.0-mm-length graphite collimator and were ∼1 × 1 mm2. The NIR-CT was accomplished by repeating the object-reciprocating translations and rotations of the object using the turntable, and the ray-sampling-translation and rotation steps were 0.1 mm and 0.5°, respectively. The scanning time was 19.6 min at a total rotation angle of 180°. Triple-sensitivity CT was accomplished using amplifiers, and a graphite rod in the chicken fillet was visible when increasing amplification factor.

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