Title :
AX-PET: Concept, proof of principle and first results with phantoms
Author :
Beltrame, P. ; Bolle, E. ; Braem, A. ; Casella, C. ; Chesi, E. ; Clinthorne, N. ; De Leo, R. ; Dissertori, G. ; Djambazov, L. ; Fanti, V. ; Joram, C. ; Kagan, H. ; Lustermann, W. ; Meddi, F. ; Nappi, E. ; Nessi-Tedaldi, F. ; Oliver, J.F. ; Pauss, F. ; Raf
Author_Institution :
PH Dept., CERN, Geneva, Switzerland
fDate :
Oct. 30 2010-Nov. 6 2010
Abstract :
AX-PET is a novel PET concept based on long crystals axially arranged and orthogonal Wavelength shifter (WLS) strips, both individually readout by Geiger-mode Avalanche Photo Diodes (G-APD). Its design was conceived in order to reduce the parallax error and simultaneously improve spatial resolution and sensitivity. The assessment of the AX-PET concept and potential was carried out through a set of measurements comprising individual module characterizations and scans in coincidence mode of point-like and extended sources. The estimated energy and spatial resolutions from point-like measurements are RFWHM=11.6% (at 511 keV) and 1.7-1.9 mm (FWHM) respectively as measured with point-like sources placed in different positions of the FOV. First results from scans of extended phantoms confirmed our expectations.
Keywords :
avalanche photodiodes; image resolution; medical image processing; phantoms; positron emission tomography; AX-PET; G-APD; Geiger-mode avalanche photo diodes; electron volt energy 511 keV; energy resolution; extended sources; parallax error; phantoms; point-like sources; sensitivity; spatial resolution; wavelength shifter; Crystals; Energy resolution; Image reconstruction; Phantoms; Positron emission tomography; Spatial resolution; Strips;
Conference_Titel :
Nuclear Science Symposium Conference Record (NSS/MIC), 2010 IEEE
Conference_Location :
Knoxville, TN
Print_ISBN :
978-1-4244-9106-3
DOI :
10.1109/NSSMIC.2010.5874294
