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Preliminary results from the new large-area PETRRA positron camera

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8 Author(s)
D. M. Duxbury ; Dept. of Phys., R. Marsden Hosp., Sutton, UK ; R. J. Ott ; M. A. Flower ; K. Erlandsson
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The PETRRA positron camera is based on the use of BaF2 scintillators interfaced to large area multiwire proportional chambers filled with a photo-sensitive vapour (TMAE). The camera consists of two 60 cm×40 cm annihilation photon detectors mounted on a rotating gantry. Initial measurements with the camera show that the spatial resolution is ~6.5±1 mm FWHM all through the field-of-view, and the timing resolution is between 7 ns and 10 ns FWHM. Detection efficiency for annihilation photons is ~30% per detector. The count rates obtained, by using a 20 cm diameter by 11 cm long water filled phantom containing 18F, were ~1.35×106 singles and ~1.2×105 cps raw coincidences at which point data-rates are limited by the dead-time in the readout system. The randoms rate varies between 5 and 50% with activity in the field of view of 10-100 MBq (0.27-2.7 mCi) with a timing gate of 20 ns. Initial results show that the randoms corrected sensitivity is >3-4 kcps/kBq/ml (120-150 kcps/μCi/ml) for activities up to 30 MBq (0.81 mCi) in a 20 cm diameter water-filled phantom. However, these values include a high (60%) scatter fraction due to detector support structures. The camera has not yet been fully optimised and it is expected that the performance will substantially improve by further tuning and a reduction in the scattering structures. With a 40 cm axial FoV the camera is ideally suited to whole-body imaging in oncology

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IEEE Transactions on Nuclear Science  (Volume:46 ,  Issue: 4 )