Two-dimensional Diced Scintillator Array for Innovative, Fine-resolution Gamma Camera

Sep 5, 2013, 2:00 PM
20m
Dahlia (B2F) (International Conference Center Hiroshima)

Dahlia (B2F)

International Conference Center Hiroshima

1-5 Nakajima-cho Naka-ku, Hiroshima Japan
ORAL Applications in Space, Medical, Biology, Material Sciences Session 7

Speaker

Takuya FUJITA (Waseda University)

Description

We are developing a technique to fabricate fine spatial resolution (FWHM < 0.5mm) and cost-effective photon counting detectors, by using silicon photomultipliers (SiPMs) coupled with finely pixelated scintillator plate. Unlike traditional X-ray imagers that use a micro-columnar CsI(Tl) plate, we can pixelate various scintillation crystal plates more than 1mm thick, and easily develop large-area, fine-pitch scintillator arrays with high precision. Coupling a fine pitch scintillator array with a SiPM array results in a compact, fast-response detector that is ideal for X-ray, gamma-ray, and charged particle detection as used in autoradiography, gamma cameras, and photon counting CTs. As the first step, we fabricated a two-dimensional, cerium-doped Gd3Al2Ga3O12(Ce:GAGG) scintillator array of 0.25mm pitch, by using a dicing saw to cut micro-grooves 50µm wide into a 1.0mm thick Ce:GAGG plate. The scintillator plate is optically coupled with a 3.0 x 3.0mm pixel 4 x 4 SiPM array and read-out via the resistive charge-division network. Even when using this simple system as a gamma camera, we obtained excellent spatial resolution of 0.45mm(FWHM) for 122-keV gamma-rays. We will present our plans to further improve signal-to-noise in the image, and also discuss a variety of possible applications in the near future.

Primary author

Takuya FUJITA (Waseda University)

Co-authors

Jun Kataoka (Waseda University) Prof. Seiichi YAMAMOTO (Nagoya University) Mr Shigeyuki NAKAMURA (Hamamatsu Photonics K. K.) Mr Shinji OHSUKA (Hamamatsu Photonics K. K.) Mr Toru NISHIYAMA (Waseda University)

Presentation materials