“…Compared to PMTs typically used for PET scintillation light detection, semiconductor-based avalanche photo-diodes (APDs) and silicon photo-multipliers (SiPMs) can be operated within strong magnetic fields, thereby making APDs and SiPMs very suitable for PET detectors to be operated within or in close proximity to an MRI bore (Vandenberghe and Marsden 2015 ). Since their introduction, numerous PET detector systems for PET–MRI based on APD (Judenhofer et al 2007 , Solis et al 2008 , Catana et al 2008 , Delso et al 2011 , Maramraju et al 2011 , Vaska et al 2011 , Kolb et al 2012 ) or SiPM technology (Hong et al 2012 , Yamamoto et al 2012 , Yoon et al 2012 , Hong et al 2013 , Levin et al 2013 , Weissler et al 2014 , Olcott et al 2015 , Weissler et al 2015a ) have been presented. In this case, the analogue APD/SiPM signals are either transmitted via copper-based, shielded cables or optical fibres from the MRI bore to the PET electronics residing outside the MRI bore to be digitized and processed (Judenhofer et al 2007 , Maramraju et al 2011 , Hong et al 2012 , Kolb et al 2012 , Yamamoto et al 2012 , Yoon et al 2012 , Hong et al 2013 , Olcott et al 2015 ), or are digitized within the MRI bore, requiring more electronics to be moved towards or housed within the MRI (General Electric ( 2014 ), Solis et al 2008 , Maramraju et al 2011 , Vaska et al 2011 , Weissler et al 2014 , 2015a )(Vandenberghe and Marsden ( 2015 ), p. R140–1).…”