Introduction ============ FreeROI is a versatile image processing software developed for neuroimaging data. Its goal is to provide a user-friendly interface for neuroimaging researchers to visualize and analyze their data, especially in defining `region of interest `_ (ROI) for ROI analysis. Features --------- As its name revealed, FreeROI is focused on the region of interest data analysis method. It has: * Powerful ROI generating and labeling methods, and the corresponding toolset and pipelines, which could be used to reliably and efficiently creating ROIs specifically for multi-modal neuroimaging analysis (eg. fMRI, Resting, DTI...), see :ref:`ROI Generation ` * Two modes to view and explore neuroimage data, including a sigle-orientation slicing viewer, and a three-orientation slicing viewer. A 3D volume viewer would also be available in the near future. For details see :ref:`Data Viewing ` * A bunch of data processing tools to manipulate and analyzing neuroimage data, see :ref:`Data Analysis Toolset ` * Support for both 3D and 4D neuroimage data, which is very useful for batch processing, see :ref:`Data format ` FreeROI is currently under active developing and maintaning by a group of experienced neuroimage data analysists, the following are some upcoming features: * more ROI statistical analysis functions * more automatic ROI generating functions based on machine learning strategies * support for surface neuroimaging data format