Fabrication and demonstration of ultra-compact 3D measurement module using silica-based planar lightwave circuit

Katayose, Satomi; Kurata, Yoshiyuki; Watanabe, Kazuhiro; Kasahara, Ryoichi; Itoh, M.; Watanabe, Daisuke; Matsuo, Keigo; Hanano, Kazunari

doi:10.35848/1347-4065/ab8f0d

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…2 However, predicting the size of the lesion based on images obtained only using the cameras mounted on endoscopes can lead to subjective variability owing to the barrel distortion characteristic of the fisheye lens of endoscopic cameras. 4 , 5 , 6 This variability is further influenced by the curvature of the gastric surface, local deformation of the tissue (such as stretching), and the presence of air caused by insufflation during surgery. Our novel MS addresses this issue by providing 3D measurement data on the curved surface.…”

Section: Discussionmentioning

confidence: 99%

Exploratory investigation of virtual lesions in gastrointestinal endoscopy using a novel phase‐shift method for three‐dimensional shape measurement

Sakamoto,

Oda,

Okamura

et al. 2024

DEN Open

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Accurate measurement of the size of lesions or distances between any two points during endoscopic examination of the gastrointestinal tract is difficult owing to the fisheye lens used in endoscopy. To overcome this issue, we developed a phase‐shift method to measure three‐dimensional (3D) data on a curved surface, which we present herein. Our system allows the creation of 3D shapes on a curved surface by the phase‐shift method using a stripe pattern projected from a small projecting device to an object. For evaluation, 88 measurement points were inserted in porcine stomach tissue, attached to a half‐pipe jig, with an inner radius of 21 mm. The accuracy and precision of the measurement data for our shape measurement system were compared with the data obtained using an Olympus STM6 measurement microscope. The accuracy of the path length of a simulated protruded lesion was evaluated using a plaster model of the curved stomach and graph paper. The difference in height measures between the measurement microscope and measurement system data was 0.24 mm for the 88 measurement points on the curved surface of the porcine stomach. The error in the path length measurement for a lesion on an underlying curved surface was <1% for a 10‐mm lesion. The software was developed for the automated calculation of the major and minor diameters of each lesion. The accuracy of our measurement system could improve the accuracy of determining the size of lesions, whether protruded or depressed, regardless of the curvature of the underlying surface.

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Section: Discussionmentioning

confidence: 99%

Exploratory investigation of virtual lesions in gastrointestinal endoscopy using a novel phase‐shift method for three‐dimensional shape measurement

Sakamoto,

Oda,

Okamura

et al. 2024

DEN Open

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“…Displacement of the projected stripe pattern by the surface relative to the con guration of the projector and camera allows for a high-de nition derivation of the 3D geometric shape of the object. [6] Accuracy of the measured distance between two points…”

Section: Development Of the Three-dimensional Visual Inspection Systemmentioning

confidence: 99%

Development of A Three-Dimensional Shape Measurement System Using A Phase-Shift Method

Sakamoto

Oda

Okamura

et al. 2020

Preprint

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Accurate measurement of the distance between any two points under endoscopic examination of the gastrointestinal tract is difficult due to the fisheye lens currently used on endoscopes. To overcome this issue, we developed a three-dimensional visual inspection system that incorporates a phase-shift method for direct measurement of a three-dimensional shape. Projection of a striped pattern is used to enable three-dimensional renderings of a surface using an industrial camera. We evaluated the accuracy of measurement relative to that of reference measurements obtained using a measurement microscope, for three-dimensional shapes on a plane and curved surface. For 60 regions of interests, with various configurations of the reference locations relative to the camera, the measurement error for our system was <0.1 mm on the plane grid and <0.5 mm on the curved surface. The accuracy of our novel three-dimensional visual inspection system could improve determination of the size of lesions with different shapes, flat or depressed, regardless of the curved surface of the gastrointestinal tract.

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“…Additionally, PLCs are attractive devices for visiblelight applications because silica is transparent in the visiblelight band. [6][7][8][9][10] By using PLCs as combiners for smart glasses, the laser beams from the LDs can be directly coupled into them. In so doing, the number of optical parts and assembly cost can be dramatically reduced.…”

Section: Introductionmentioning

confidence: 99%

Silica-based planar lightwave circuits with high resistance against blue light for visible-light application

Fujiwara

Sakamoto

Katayose

et al. 2022

Jpn. J. Appl. Phys.

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We propose two novel types of waveguide, Zr-doped and non-doped silica, for high-power visible-light applications. We fabricated these waveguides and investigated their resistance against blue light. Both Zr-doped and non-doped silica waveguides showed one order of magnitude higher resistance against blue light compared with conventional Ge-doped silica waveguides. A comparison of their resistances indicated that Zr-doped silica waveguides are useful against blue light powers up to about 20 mW and non-doped silica waveguides have more potential for higher resistance against blue light powers over 20 mW.

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Fabrication and demonstration of ultra-compact 3D measurement module using silica-based planar lightwave circuit

Cited by 4 publications

References 26 publications

Exploratory investigation of virtual lesions in gastrointestinal endoscopy using a novel phase‐shift method for three‐dimensional shape measurement

Exploratory investigation of virtual lesions in gastrointestinal endoscopy using a novel phase‐shift method for three‐dimensional shape measurement

Development of A Three-Dimensional Shape Measurement System Using A Phase-Shift Method

Silica-based planar lightwave circuits with high resistance against blue light for visible-light application

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