  Determining the brain perfusion is an important task for the diagnosis and
treatment of vascular diseases such as occlusions and intracerebral
haemorrhage. Even after successful diagnosis and treatment, there is a high
risk of restenosis or rebleeding such that patients need intense and frequent
attention in the days after treatment. Within this work, we will present a
diagnostic tomographic imager that allows access to brain perfusion information
quantitatively in short intervals. The imager is the first functional magnetic
particle imaging device for brain imaging on a human-scale. It is highly
sensitive and allows the detection of an iron concentration of 14.7 ng /ml (263
pmol\ml), which is the lowest iron concentration imaged by MPI so far. The
imager is self-shielded and can be used in unshielded environments such as
intensive care units. In combination with the low technical requirements this
opens up a whole variety of possible medical applications and would allow
monitoring possibilities on the stroke and intensive care units.
