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A prototype BaF2/TMAE low pressure multiwire proportional chamber for PET

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6 Author(s)
Suckling, J. ; Inst. of Cancer Res., R. Marsden Hosp., Sutton, UK ; Ott, R.J. ; Marsden, P.K. ; Bateman, J.E.
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A prototype annihilation photon detector combining a 50 mm×50 mm×8 mm BaF2 scintillator with an MWPC (multiwire proportional chamber) filled with a photoionizing vapor (TMAE) at low pressure has been constructed. The structure of the detector is currently undergoing optimization but its present performance includes 8 mm FWHM (full width at half maximum) spatial resolution, 12-ns timing resolution, and 19% efficiency. It is intended that this technology, once proven, should form the basis for a clinical PET (positron emission tomography) system. In order to cover the large active areas (600 mm×400 mm) of a clinical system, it will be necessary to use tiles of BaF2. Crystal boundary effects on image quality, studied using Monte Carlo methods, show degraded spatial resolution by 40% axially and 27% radially/tangentially for a 6×4 array of 16 mm-thick crystals replacing a hypothetical large single crystal. Further studies to characterize the distribution of scattered events in the proposed camera are described

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Nuclear Science, IEEE Transactions on  (Volume:38 ,  Issue: 2 )