Speaker
Dr
Francesco Cusanno
(Istituto Nazionale Fisica Nucleare)
Description
Dedicated high resolution detectors are needed for detection of small tumors by
molecular imaging with radionuclides. Absorptive collimation typically used for
imaging single photon emitters, results in a strong reduction in efficiency. System
based on electronic collimation is offering higher efficiency but is complex and
expensive. For these reasons, the simulations and measurements have been performed
to design dedicated high resolution mini gamma cameras. Critical parameters are
contrast and Signal to Noise Ratio (SNR). Intrinsic performance (spatial resolution
and pixel identification, linearity) were optimized as first. Pixellated
scintillator arrays (NaI(Tl)) of different pixel sizes were coupled to arrays of
PSPMT’s with different anode dimensions (6 x 6 mm2 and 3 x 3 mm2). Detectors
having a Field Of View (FOV) of 100 x 100 mm2 and 150 x 200 mm2 were designed and
built. The electronic system allows readout of all anode pad signals. The
collimation technique was then considered and the limits of the coded aperture
option were studied. First clinical trials performed in the framework of the
Italian National Insitute project and Universities of Rome Tor Vergata and Napoli
will be presented.
Author
Dr
Evaristo Cisbani
(Istituto Superiore di Sanita')
Co-authors
Mr
Evaristo Colilli
(Istituto Superiore di Sanita')
Mr
Fabio Santavenere
(Istituto Superiore di Sanita')
Mr
Fausto Giuliani
(Istituto Superiore di Sanita')
Dr
Francesco Cusanno
(Istituto Nazionale Fisica Nucleare)
Dr
Franco Garibaldi
(Istituto Superiore di Sanita' and Istituto Nazionale Fisica Nucleare)
Dr
Maria Lucia Magliozzi
(University "La Sapienza")
Mr
Massimo Gricia
(Istituto Superiore di Sanita')
Mr
Maurizio Lucentini
(Istituto Superiore di Sanita')
Mr
Piero Veneroni
(Istituto Nazionale Fisica Nucleare)
Mr
Rolando Fratoni
(Istituto Superiore di Sanita')
Dr
Sergio Torrioli
(C.I.S.B.)
Dr
Stan Majewski
(Jefferson Lab)
