@inproceedings{WeberTersteggeEngelsetal.1996,
  author    = {Weber, S. and Terstegge, Andreas and Engels, R. and Herzog, H. and Reinartz, R. and Reinhart, P. and Rongen, F. and M{\"u}ller-G{\"a}rtner, H. W. and Halling, H.},
  title     = {The KFA TierPET: performance characteristics and measurements},
  series = {Conference record / 1996 IEEE Nuclear Science Symposium [and Medical Imaging], November 2 - 9, 1996, Anaheim, California ; vol. 2},
  booktitle = {Conference record / 1996 IEEE Nuclear Science Symposium [and Medical Imaging], November 2 - 9, 1996, Anaheim, California ; vol. 2},
  publisher = {IEEE},
  address   = {Piscataway, NJ},
  organization    = {Institute of Electrical and Electronics Engineers},
  isbn      = {0-7803-3534-1},
  issn      = {1082-3654},
  pages     = {1117 -- 1119},
  year      = {1996},
  language  = {en}
}
@article{HeinrichBlumBussmannetal.2002,
  author    = {Heinrich, U. and Blum, A. and Bussmann, N. and Engels, R. and Kemmerling, G. and Weber, S. and Ziemons, Karl},
  title     = {Statistical studies on the light output and energy resolution of small LSO single crystals with different surface treatments combined with various reflector materials},
  series = {Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment},
  volume    = {486},
  journal   = {Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment},
  number    = {1-2},
  issn      = {0168-9002},
  pages     = {60 -- 66},
  year      = {2002},
  abstract  = {The optimization of light output and energy resolution of scintillators is of special interest for the development of high resolution and high sensitivity PET. The aim of this work is to obtain statistically reliable results concerning optimal surface treatment of scintillation crystals and the selection of reflector material. For this purpose, raw, mechanically polished and etched LSO crystals (size 2×2×10 mm3) were combined with various reflector materials (Teflon tape, Teflon matrix, BaSO4) and exposed to a 22Na source. In order to ensure the statistical reliability of the results, groups of 10 LSO crystals each were measured for all combinations of surface treatment and reflector material. Using no reflector material the light output increased up to 551±35\% by mechanical polishing the surface compared to 100±5\% for raw crystals. Etching the surface increased the light output to 441±29\%. The untreated crystals had an energy resolution of 24.6±4.0\%. By mechanical polishing the surface it was possible to achieve an energy resolution of 13.2±0.8\%, by etching of 14.8±0.7\%. In combination with BaSO4 as reflector material the maximum increase of light output has been established to 932±57\% for mechanically polished and 895±61\% for etched crystals. The combination with BaSO4 also caused the best improvement of the energy resolution up to 11.6±0.2\% for mechanically polished and 12.2±0.3\% for etched crystals. Relating to the light output there was no significant statistical difference between the two surface treatments in combination with BaSO4. In contrast to this, the statistical results of the energy resolution have shown the combination of mechanical polishing and BaSO4 as the optimum.},
  language  = {en}
}
@article{BussmannEngelsFussetal.2000,
  author    = {Bussmann, N. and Engels, R. and Fuss, L. and Kemmerling, G. and Reinartz, R. and Langen, K.-J. and Schelten, J. and Ziemons, Karl},
  title     = {Performance measurement of a new high resolution detector system for I-131 thyroid studies},
  series = {2000 IEEE Nuclear Science Symposium Conference Record, Vol. 3},
  journal   = {2000 IEEE Nuclear Science Symposium Conference Record, Vol. 3},
  issn      = {1082-3654},
  pages     = {22/35 -- 22/37},
  year      = {2000},
  abstract  = {A 2-dimensional detector system for high resolution thyroid I-131 scintigraphy was developed. It has a sensitive area of 4 cm×4 cm and consists of a lead-collimator and an array of 10×10 EGO crystals combined with a position sensitive photomultiplier. The spatial resolution and the sensitivity of the detector has been measured and compared to two commercially available gamma-cameras. Furthermore first patient measurements have been carried out},
  language  = {de}
}