| Article | |
| Title | A High-Resolution PET Demonstrator using a Silicon “Magnifying Glass” |
| Author(s) | Clinthorne, Neal ; Cochran, Eric ; Chesi, Enrico (CERN) ; Grkovski, Milan ; Grošičar, Borut ; Honscheid, Klaus ; Huh, Sam S ; Kagan, Harris ; Lacasta, Carlos ; Brzezinski, Karol ; Linhart, Vladimir ; Mikuž, Marko ; Smith, D Shane ; Stankova, Vera ; Studen, Andrej ; Weilhammer, Peter (CERN) ; Žontar, Dejan |
| Publication | 2012 |
| Number of pages | 9 |
| In: | Phys. Procedia 37 (2012) 1488-1496 |
| In: | 2nd International Conference on Technology and Instrumentation in Particle Physics, Chicago, IL, USA, 9 - 14 Jun 2011, pp.1488-1496 |
| DOI | 10.1016/j.phpro.2012.03.747 |
| Subject category | Detectors and Experimental Techniques |
| Abstract | To assist ongoing investigations of the limits of the tradeoff between spatial resolution and noise in PET imaging, several PET instruments based on silicon-pad detectors have been developed. The latest is a segment of a dual-ring device to demonstrate that excellent reconstructed image resolution can be achieved with a scanner that uses highresolution detectors placed close to the object of interest or surrounding a small field-of-view in combination with detectors having modest resolution at larger radius. The outer ring of our demonstrator comprises conventional BGO block detectors scavenged from a clinical PET scanner and located at a 500 mm radius around a 50 mm diameter field-of-view. The inner detector–in contrast to the high-Z scintillator typically used in PET–is based on silicon-pad detectors located at 70 mm nominal radius. Each silicon detector has 512 1.4 mm x 1.4 mm x 1 mm detector elements in a 16 x 32 array and is read out using VATA GP7 ASICs (Gamma Medica-Ideas, Northridge, CA). Even though virtually all interactions of 511 keV annihilation photons in silicon are Compton-scatter, both high spatial resolution and reasonable sensitivity appears possible. The system has demonstrated resolution of ∼ 0.7 mm FWHM with Na-22 for coincidences having the highest intrinsic resolution (silicon-silicon) and 5–6 mm FWHM for the lowest resolution BGO-BGO coincidences. Spatial resolution for images reconstructed from the mixed silicon-BGO coincidences is ∼1.5 mm FWHM demonstrating the “magnifying-glass” concept. |
| Copyright/License | publication: © 2012-2024 Elsevier (License: CC-BY-NC-ND-3.0) |
Corresponding record in: Inspire
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