Fig. 3

Categorization of contributions after applying exclusion criterion 2. The papers were sorted according to their main method (left), used MRI sequences/contrasts (middle) and number of subjects, i.e. phantom, patients or volunteers (right). In the above categories, the following simplifications were made: head = brain, whole body = torso, cervix = prostate (only 1 study), UTE = dUTE, and water/fat separating MRI sequences = Dixon. Volunteers and phantoms were categorized as patients. Some papers included description of multiple methods which were included in the histograms as separate studies, hence the term “published studies” for the ordinate