The invention relates to quality control devices and methods for magnetic resonancernimaging (MRI) systems, more particularly for medical imaging applications. An example isrnstereotactic surgery where MRI images are combined with X-ray images to accuratelyrnlocate a target in a subject.rnA test device (1), and an associated method using said test object, are used torneasily detect a faulty calibration or a malfunction of an MRI device.rnThe test device includes:rna hermetically sealable hollow body (20) having a substantially cylindrical shape,rna support frame (22) configured to be removably inserted in the hollow body andrndefining a target region (V22) having a substantially cylindrical shape; andrna plurality of target objects (24) made of a material visible on X-ray images and MRIrnimages said target objects being arranged in the target region and being attached to thernsupport frame.