An MRI configuration comprising a magnet system for generating a homogeneous magnetic field, a radio frequency (RF) system (105) for generating/detecting an RF field B.sub.1, and a gradient system (106) for temporarily superposing defined gradient fields on a magnetic field B.sub.0, and an MRI phantom (104) positioned in the volume under investigation, wherein the MRI phantom (104) comprises a chamber (1) disposed in a housing (2) and filled with a liquid, in which a gas bubble (3) forms, wherein the liquid contains nuclei which have an NMR relaxation time T.sub.1, of between 100 ms and 20 s, is characterized in that the chamber (1) of the MRI phantom (104) comprises a main chamber (4) and a partial chamber (5), wherein the main chamber (4) is delimited from the partial chamber (5) such that the gas bubble (3) can completely enter the partial chamber (5) due to its buoyancy by changing the spatial orientation of the MRI phantom (104) in the gravitation field, and remains in the partial chamber (5) in a measurement orientation of the MRI phantom (104) due to its buoyancy. This eliminates imaging artefacts despite the presence of a gas bubble.