NDLI: Development of PET detectors using monolithic scintillation crystals processed with sub-surface laser engraving technique

Content Provider	IEEE Xplore Digital Library
Author	Moriya, T. Fukumitsu, K. Sakai, T. Ohsuka, S. Okamoto, T. Takahashi, H. Watanabe, M. Yamashita, T.
Copyright Year	2009
Description	Author affiliation: Electron Tube Division, Hamamatsu Photonics K.K., Iwata-City, 438-0193 Japan (Fukumitsu, K.; Sakai, T.; Okamoto, T.) \|\| Central Research Laboratory, Hamamatsu Photonics K.K., Hamamatsu-City, 434-8601 Japan (Moriya, T.; Ohsuka, S.; Takahashi, H.; Watanabe, M.; Yamashita, T.)
Abstract	New monolithic scintillation detectors for PET have been developed, where the crystals are processed using internal focused laser processing technique, which is called subsurface laser engraving (SSLE) technique. When high intensity light pulses of short duration from a laser are focused into a scintillation crystal, they induce multi-photon absorption at the focal point and result in refractive index changes or micro-cracks inside the crystal. By applying the SSLE technique to a monolithic scintillation block, fine segmentation in the crystal can be formed without inter-pixel gaps. We have fabricated 2D segmented arrays engraved various patterns of micro-cracks inside monolithic LYSO crystal blocks by using a Nd:YAG laser. The processed crystal array segmented to 12 × 12 with 1.67 mm pitch have been evaluated by coupling to a position-sensitive photomultiplier tube (PS-PMT). The 2D position histograms were measured for uniform irradiation of gamma-rays and each crystal segment was clearly separated. The average energy resolution was 9.7%, similar to that of the conventional arrays, so that the laser processed LYSO crystals have kept their primary scintillation properties. We have also evaluated the laser processed crystals by using multi-pixel photon counters (MPPCs) to investigate the possibilities as a future PET detector. These results suggest that it is possible to fabricate high performance PET detectors using the SSLE technique.
Starting Page	3560
Ending Page	3564
File Size	391557
Page Count	5
File Format	PDF
ISBN	9781424439614
ISSN	10957863
DOI	10.1109/NSSMIC.2009.5401817
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Positron emission tomography Solid scintillation detectors Photonic crystals Optical arrays Scintillation counters Optical pulses Laser transitions Absorption Refractive index Photomultipliers
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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