Combined positron emission tomography and magnetic resonance tomography
unit for imaging an examination object in an examination space,
comprising a positron emission tomography unit that has a unit part
assigned to the examination space, and a first evaluation unit for
evaluating the electric signals for a positron emission tomography image
of the examination object. The unit part in this case comprises a gamma
ray detector with an assigned electronics unit. Furthermore, the combined
unit comprises a magnetic resonance tomography unit and a second
evaluation unit for evaluating the magnetic resonance signals for a
magnetic resonance image of the examination object. The magnetic
resonance unit in this case has a high frequency antenna device as well
as a gradient coil system, the high frequency antenna device being
arranged nearer to the examination space than the gradient coil system,
as well as a high frequency shield arranged between the gradient coil
system and the high frequency antenna device. The positron emission
tomography unit part is arranged in this case between the high frequency
shield and the high frequency antenna device, and is provided, at least
on the side facing the high frequency antenna device, with a shielding
cover that is caused by the high frequency antenna device and is opaque
to high frequency radiation.