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Proceedings Paper

Laser pixelation of thick scintillators for medical imaging applications: x-ray studies
Author(s): Hamid Sabet; Haris Kudrolli; Zsolt Marton; Bipin Singh; Vivek V. Nagarkar
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Paper Abstract

To achieve high spatial resolution required in nuclear imaging, scintillation light spread has to be controlled. This has been traditionally achieved by introducing structures in the bulk of scintillation materials; typically by mechanical pixelation of scintillators and fill the resultant inter-pixel gaps by reflecting materials. Mechanical pixelation however, is accompanied by various cost and complexity issues especially for hard, brittle and hygroscopic materials. For example LSO and LYSO, hard and brittle scintillators of interest to medical imaging community, are known to crack under thermal and mechanical stress; the material yield drops quickly with large arrays with high aspect ratio pixels and therefore the pixelation process cost increases. We are utilizing a novel technique named Laser Induced Optical Barriers (LIOB) for pixelation of scintillators that overcomes the issues associated with mechanical pixelation. In this technique, we can introduce optical barriers within the bulk of scintillator crystals to form pixelated arrays with small pixel size and large thickness. We applied LIOB to LYSO using a high-frequency solid-state laser. Arrays with different crystal thickness (5 to 20 mm thick), and pixel size (0.8×0.8 to 1.5×1.5 mm2) were fabricated and tested. The width of the optical barriers were controlled by fine-tuning key parameters such as lens focal spot size and laser energy density. Here we report on LIOB process, its optimization, and the optical crosstalk measurements using X-rays. There are many applications that can potentially benefit from LIOB including but not limited to clinical/pre-clinical PET and SPECT systems, and photon counting CT detectors.

Paper Details

Date Published: 26 September 2013
PDF: 6 pages
Proc. SPIE 8853, Medical Applications of Radiation Detectors III, 88530B (26 September 2013); doi: 10.1117/12.2029778
Show Author Affiliations
Hamid Sabet, Radiation Monitoring Devices, Inc. (United States)
Haris Kudrolli, Radiation Monitoring Devices, Inc. (United States)
Zsolt Marton, Radiation Monitoring Devices, Inc. (United States)
Bipin Singh, Radiation Monitoring Devices, Inc. (United States)
Vivek V. Nagarkar, Radiation Monitoring Devices, Inc. (United States)


Published in SPIE Proceedings Vol. 8853:
Medical Applications of Radiation Detectors III
H. Bradford Barber; Hans Roehrig, Editor(s)

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