Carimas is a general medical imaging processing platform developed in Turku PET Centre in Finland. Carimas is for research use only – not for use in diagnostic procedure. Originally, Carimas was designed for visualization, segmentation and modelling of PET data only. However, the latest versions support processing imaging data from most medical imaging modalities, such as CT and MRI. Using Carimas, you can easily visualize your imaging data in many different ways, such as in 2D or 3D, or fuse images from different modalities (PET/CT, PET/MRI). Furthermore, Carimas provides a lot of advanced functions for researchers. For example, using ROI/VOI tools, the user can draw a region/volume of interest in manual, semi-automatic or automatic manner; using the modelling tools, the user can perform advanced analysis for his/her research data; using Heart tools, cardiac researchers can easily analyze their PET studies.