Liquid Xenon Detectors for Positron Emission Tomography
  PET is a functional imaging technique based on detection of annihilation photons following beta decay producing positrons. In this paper, we present the concept of a new PET system for preclinical applications consisting of a ring of twelve time projection chambers filled with liquid xenon viewed by avalanche photodiodes. Simultaneous measurement of ionization charge and scintillation light leads to a significant improvement to spatial resolution, image quality, and sensitivity. Simulated performance shows that an energy resolution of <10% (FWHM) and a sensitivity of 15% are achievable. First tests with a prototype TPC indicate position resolution <1 mm (FWHM). 
A. Miceli, P. Amaudruz, F. Benard, D. A. Bryman, L. Kurchaninov, J. P.   Martin, A. Muennich, F. Retiere, T. J. Ruth, V. Sos...
physics.ins-det physics.med-ph