Influence and Compensation of Truncation Artifacts in MR-Based Attenuation Correction in PET/MR. - Georg Schramm; Jens Langner; Frank Hofheinz; Jan Petr; Alexandr Lougovski; Bettina Beuthien-Baumann; Ivan Platzek; Jörg van den Hoff (IEEE Trans. Medical Imaging, 2013)