@article{e5ae7afb975c4ebb8e2c3a1640e49c6b,
title = "Application and performance of an ML-EM algorithm in NEXT.",
abstract = "The goal of the NEXT experiment is the observation of neutrinoless double beta decay in 136Xe using a gaseous xenon TPC with electroluminescent amplification and specialized photodetector arrays for calorimetry and tracking. The NEXT Collaboration is exploring a number of reconstruction algorithms to exploit the full potential of the detector. This paper describes one of them: the Maximum Likelihood Expectation Maximization (ML-EM) method, a generic iterative algorithm to find maximum-likelihood estimates of parameters that has been applied to solve many different types of complex inverse problems. In particular, we discuss a bi-dimensional version of the method in which the photosensor signals integrated over time are used to reconstruct a transverse projection of the event. First results show that, when applied to detector simulation data, the algorithm achieves nearly optimal energy resolution (better than 0.5% FWHM at the Q value of 136Xe) for events distributed over the full active volume of the TPC.",
keywords = "Gaseous imaging and tracking detectors, Image reconstruction in medical imaging, Medical-image reconstruction methods and algorithms, computer-aided software, Time projection Chambers (TPC)",
author = "{NEXT collaboration} and A. Sim{\'o}n and C. Lerche and F. Monrabal and G{\'o}mez-Cadenas, {J. J.} and V. {\'A}lvarez and Azevedo, {C. D.R.} and Benlloch-Rodr{\'i}guez, {J. M.} and Borges, {F. I.G.M.} and A. Botas and S. C{\'a}rcel and Carri{\'o}n, {J. V.} and S. Cebri{\'a}n and Conde, {C. A.N.} and J. D{\'i}az and M. Diesburg and J. Escada and R. Esteve and R. Felkai and Fernandes, {L. M.P.} and P. Ferrario and Ferreira, {A. L.} and Freitas, {E. D.C.} and A. Goldschmidt and D. Gonz{\'a}lez-D{\'i}az and Guti{\'e}rrez, {R. M.} and J. Hauptman and Henriques, {C. A.O.} and Hernandez, {A. I.} and {Hernando Morata}, {J. A.} and V. Herrero and Jones, {B. J.P.} and L. Labarga and A. Laing and P. Lebrun and I. Liubarsky and N. L{\'o}pez-March and M. Losada and J. Mart{\'i}n-Albo and G. Mart{\'i}nez-Lema and A. Mart{\'i}nez and McDonald, {A. D.} and Monteiro, {C. M.B.} and Mora, {F. J.} and Moutinho, {L. M.} and J. Mu{\~n}ozVidal and M. Musti and M. Nebot-Guinot and P. Novella and Nygren, {D. R.} and B. Palmeiro",
note = "Funding Information: FCT and FEDER through the program COMPETE, project PTDC/FIS/103860/2008; the U.S. Department of Energy under contracts number DE-AC02-07CH11359 (Fermi National Accelerator Laboratory) and DE-FG02-13ER42020 (Texas A&M); and the University of Texas at Arlington. Funding Information: The NEXT Collaboration acknowledges support from the following agencies and institutions: the European Research Council (ERC) under the Advanced Grant 339787-NEXT; the Ministerio de Econom{\'i}a y Competitividad of Spain under grants FIS2014-53371-C04 and the Severo Ochoa Program SEV-2014-0398; the GVA of Spain under grant PROMETEO/2016/120; the Portuguese Publisher Copyright: {\textcopyright} 2020 Future Medicine Ltd.. All rights reserved.",
year = "2017",
month = aug,
day = "16",
doi = "10.1088/1748-0221/12/08/P08009",
language = "English (US)",
volume = "12",
journal = "Journal of Instrumentation",
issn = "1748-0221",
publisher = "IOP Publishing Ltd.",
number = "8",
}