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

2021 ◽  
Vol 92 (1) ◽  
pp. 013702
Author(s):  
Eiichi Sato ◽  
Yasuyuki Oda ◽  
Sohei Yoshida ◽  
Kunihiro Yoshioka ◽  
Hodaka Moriyama ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Laser Beam ◽  
Near Infrared ◽  
Near Infrared Ray

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

2019 ◽  
Author(s):  
Eiichi Sato ◽  
Yasuyuki Oda ◽  
Yuichi Sato ◽  
Sohei Yoshida ◽  
Hodaka M. Oriyama ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Near Infrared ◽  
Near Infrared Ray

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

Physics Open ◽  
2020 ◽  
Vol 2 ◽  
pp. 100010 ◽  
Author(s):  
Eiichi Sato ◽  
Akiko Yoshida ◽  
Toshihiro Someya ◽  
Yasuyuki Oda ◽  
Sohei Yoshida ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Near Infrared ◽  
Living Body ◽  
Near Infrared Ray

850-nm-peak high-sensitivity near-infrared-ray computed tomography scanner in the living-body window

2018 ◽  
Vol 8 (3) ◽  
pp. 205-210 ◽  
Author(s):  
Yuichi Sato ◽  
Akiko Takaoka ◽  
Tsukuru Sato ◽  
Eiichi Sato ◽  
Yasuyuki Oda ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Near Infrared ◽  
High Sensitivity ◽  
Living Body ◽  
Near Infrared Ray ◽  
Computed Tomography Scanner

Investigation of a near-infrared-ray computed tomography scanner

2016 ◽  
Author(s):  
Eiichi Sato ◽  
Yasuyuki Oda ◽  
Yuichi Satoi ◽  
Satoshi Yamaguchi ◽  
Tomotaka Ishii ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Near Infrared ◽  
Near Infrared Ray ◽  
Computed Tomography Scanner

scholarly journals Characterization of dissimilar aluminum-copper material joining by controlled dual laser beam

2021 ◽  
Author(s):  
Joon Ho Cha ◽  
Hae Woon Choi
Keyword(s):  
Laser Beam ◽  
Power Distribution ◽  
Near Infrared ◽  
Weld Zone ◽  
Tensile Tests ◽  
Bead Width ◽  
Single Beam ◽  
The Core ◽  
Beam Laser ◽  
Dual Laser

Abstract Laser technology has many advantages in welding for the manufacture of EV battery packs. Aluminum (Al) and copper (Cu) are welded using a dual laser beam, suggesting the optimum power distribution for the core and ring beams. Due to the very high reflectance of Cu and Al exposed to near-infrared lasers, the material absorbs a very small amount of energy. Compared to single beam laser welding, dual beam welding has significantly improved surface quality by controlling surface solidification. The study focused on the quality of weld surface beads, weld properties and tensile strength by varying the output ratio of the core beam to the ring beam. Optimal conditions of Al6061 were a 700 W core beam, a 500 W ring beam and 200 mm/s of weld speed. For the C1020P, the optimum conditions were a center beam of 2500 W, a ring beam of 3000 W and a welding speed of 200 mm/s. In laser lap welding of Al-Al and Al-Cu, the bead width and the interfacial bead width of the joint increased as the output increased. The penetration depth did not change significantly, but small pores were formed at the interface of the junction. Tensile tests were performed to demonstrate the reliability of the weld zone, and computer simulations provided analysis of the heat distribution for optimal heat input conditions.

scholarly journals Melanoma Cancer Therapy Using PEGylated Nanoparticles and Semiconductor Laser

2021 ◽  
Author(s):  
Abdorreza Asrar ◽  
Zahra Sobhani ◽  
Mohammad Ali Behnam
Keyword(s):  
Cancer Therapy ◽  
Laser Beam ◽  
Photothermal Therapy ◽  
Near Infrared ◽  
Histopathological Study ◽  
Melanoma Tumor ◽  
Tio2 Nps ◽  
Melanoma Cancer ◽  
Murine Melanoma ◽  
Pegylated Nanoparticles

Purpose: Photothermal therapy is a procedure that converts laser beam energy to heat so can disturb tumor cells. Carbon nanotubes (CNTs) have unique properties in absorption optical energy and could change optical power into heat in photothermal therapy procedures. Additionally, titanium dioxide (TiO2) NPs have a unique feature in absorbing and scattering light. Therefore, these mentioned NPs could play a synergistic role in the photothermal therapy method. Methods: CNTs and TiO2 NPs were injected into the melanoma tumor sites of cancerous mice. Then sites were excited using the laser beam (λ= 808nm, P= 2W, and I= 4W/cm2). Injected NPs caused hyperthermia in solid tumors. Tumor size assay, statistical analysis, and histopathological study of the treated cases were performed to assess the role of mentioned NPs in photothermal therapy of murine melanoma cancer. Results: The results showed that CNTs performed better than TiO2 NPs in destroying murine melanoma cancer cells in animals. Conclusion: The present study compared the photothermal activity of excited CNTs and TiO2 NPs in cancer therapy at the near-infrared spectrum of light. Tumors were destroyed selectively because of their weakened heat resistance versus normal tissue. Photothermal therapy of malignant melanoma through CNTs caused remarkable necrosis into the tumor tissues versus TiO2 NPs.

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