NEMA Count-Rate Evaluation of the First and Second Generation of the Ecat Exact and Ecat Exact HR Family of Scanners. - Eriksson, Lars; Wienhard, K.; Eriksson, Marita; Casey, M. E.; Knoess, C.; Bruckbauer, T.; Hamill, J.; Mulnix, T.; Vollmar, S.; Bendriem, B.; Heiss, W. D.; Nutt, R. (IEEE Transactions on Nuclear Science, 2002)