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Proceedings Paper

Ultra-compact imaging plate scanner module using a MEMS mirror and specially designed MPPC
Author(s): Yuichi Miyamoto; Kensuke Sasaki; Masaomi Takasaka; Masatoshi Fujimoto; Koei Yamamoto
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Paper Abstract

Computed radiography (CR), which is one of the most useful methods for dental imaging and nondestructive testing, uses a phosphor imaging plate (IP) because it is flexible, reusable, and inexpensive. Conventional IP scanners utilize a galvanometer or a polygon mirror as a scanning device and a photomultiplier as an optical sensor. Microelectromechanical systems (MEMS) technology currently provides silicon-based devices and has the potential to replace such discrete devices and sensors. Using these devices, we constructed an ultra-compact IP scanner. Our extremely compact plate scanner utilizes a module that is composed of a one-dimensional MEMS mirror and a long multi-pixel photon counter (MPPC) that is combined with a specially designed wavelength filter and a rod lens. The MEMS mirror, which is a non-resonant electromagnetic type, is 2.6 mm in diameter with a recommended optical scanning angle up to ±15°. The CR’s wide dynamic range is maintained using a newly developed MPPC. The MPPC is a sort of silicon photomultiplier and is a high-sensitivity photon-counting device. To achieve such a wide dynamic range, we developed a long MPPC that has over 10,000 pixels. For size reduction and high optical efficiency, we set the MPPC close to an IP across the rod lens. To prevent the MPPC from detecting excitation light, which is much more intense than photo-stimulated light, we produced a sharp-cut wavelength filter that has a wide angle (±60°) of tolerance. We evaluated our constructed scanner module through gray chart and resolution chart images.

Paper Details

Date Published: 20 February 2017
PDF: 10 pages
Proc. SPIE 10110, Photonic Instrumentation Engineering IV, 101100K (20 February 2017); doi: 10.1117/12.2250226
Show Author Affiliations
Yuichi Miyamoto, Hamamatsu Photonics K.K. (Japan)
Kensuke Sasaki, Hamamatsu Photonics K.K. (Japan)
Masaomi Takasaka, Hamamatsu Photonics K.K. (Japan)
Masatoshi Fujimoto, Hamamatsu Photonics K.K. (Japan)
Koei Yamamoto, Hamamatsu Photonics K.K. (Japan)

Published in SPIE Proceedings Vol. 10110:
Photonic Instrumentation Engineering IV
Yakov G. Soskind; Craig Olson, Editor(s)

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