Physics – Medical Physics
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apsp.conf..645d&link_type=abstract
ASTROPARTICLE, PARTICLE AND SPACE PHYSICS, DETECTORS AND MEDICAL PHYSICS APPLICATIONS. Proceedings of the 10th Conference. Held
Physics
Medical Physics
Scientific paper
The 3D HPD-PET concept is based on stacks of ~15 cm long axially oriented scintillator bars read out at both ends by a segmented HPD. The x and y spatial resolution of this concept are linked to the transverse sizes of the scintillators, while the z axial resolution to their length Lc and to the effective scintillation light attenuation length λeff. To improve this last resolution without decreasing Lc or λeff, we propose an alternative read out of the axial coordinate based on hodoscopes of thin wavelength shifter (WLS) strips, oriented orthogonal to the axis of the crystals, and singularly read out by G-APDs. A voxel resolution of about 10 mm3 is expected. The validity of the method has been proved and its performance has been measured using PMTs and G-APDs to read out the LYSO (LSO) scintillators and wavelength shifting strips 2 mm wide. Axial resolutions of about 2.5 mm (FWHM) have been obtained for γ-rays of 511 keV.
Albrecht Simon
Braem André
Chesi Enrico
de Leo Raffaele
Johnson Ian
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