Systems and methods include acquisition of magnetic resonance data of a subject disposed in a first position, acquisition of positron emission tomography data of imaging hardware and of the subject disposed substantially in the first position, generation of a subject attenuation correction map of the subject based on the magnetic resonance data, determination of an imaging hardware attenuation correction map associated with the imaging hardware, determination of a target location and orientation of the imaging hardware attenuation correction map with respect to the positron emission tomography data and based on the positron emission tomography data and on the subject attenuation correction map, and application of attenuation correction to the positron emission tomography data based on the imaging hardware attenuation correction map in the target location and orientation and the subject attenuation correction map to generate attenuation-corrected positron emission tomography data.