Journal Title
Title of Journal: Radiol Phys Technol
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Abbravation: Radiological Physics and Technology
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Authors: Eiji Yoshida Hideaki Tashima Naoko Inadama Fumihiko Nishikido Takahiro Moriya Tomohide Omura Mitsuo Watanabe Hideo Murayama Taiga Yamaya
Publish Date: 2012/07/11
Volume: 6, Issue: 1, Pages: 21-27
Abstract
The X’tal cube is a depthofinteraction DOIPET detector which is aimed at obtaining isotropic resolution by effective readout of scintillation photons from the six sides of a crystal block The X’tal cube is composed of the 3D crystal block with isotropic resolution and arrays of multipixel photon counters MPPCs In this study to fabricate the 3D crystal block efficiently and precisely we applied a subsurface laser engraving SSLE technique to a monolithic crystal block instead of gluing segmented small crystals The SSLE technique provided microcrack walls which carve a groove into a monolithic scintillator block Using the fabricated X’tal cube we evaluated its intrinsic spatial resolution to show a proof of concept of isotropic resolution The 3D grids of 2 mm pitch were fabricated into an 18 × 18 × 18 mm3 monolithic lutetium yttrium orthosilicate LYSO crystal by the SSLE technique 4 × 4 MPPCs were optically coupled to each surface of the crystal block The X’tal cube was uniformly irradiated by 22Na gamma rays and all of the 3D grids on the 3D position histogram were separated clearly by an Angertype calculation from the 96channel MPPC signals Response functions of the X’tal cube were measured by scanning with a 22Na point source The gammaray beam with a 10 mm slit was scanned in 025 mm steps by positioning of the X’tal cube at vertical and 45° incident angles The average FWHM resolution at both incident angles was 21 mm Therefore we confirmed the isotropic spatial resolution performance of the X’tal cube
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