Biomedical Systems and Biosignals is an area with a broad scope, covering a very long list of topics. Roughly subdividing we can say that Biomedical Systems encompasses all hardware implementations and physical interaction with biological beings while Biosignals relate to the signal processing associated with interpretation, representation and modelling of biological functional systems, both with a medical and engineering emphasys, actually bridging the two. Further reasoning along these lines of thought leads to a non-exhaustive topic subdivision as follows
Quantitative functional neuroimaging using BOLD - ASL fMRI
Non-invasive brain perfusion imaging using ASL MRI;
Dynamic neuroimaging by simultaneous EEG-fMRI in epilepsy;
Modelling and estimation of brain haemodynamics and connectivity;
Clinical applications of fMRI and perfusion imaging using ASL.