fScan is a single C program (approximately 56,000 lines of code) that was developed primarily for on-line processing of fMRI scans (Voyvodic, 1999).

Version 1 of fScan was first created at the Univerity of Pittsburgh and then extensively modified at Duke. Version 2 is a completely rewritten implementation of fScan, which will soon replace Version 1.

fScan has been implemented on Unix (Irix, Solaris, AIX, Mac OS X), Linux (Redhat), and Windows (98, NT, and XP) operating systems. The program uses no software libraries except the standard system libraries and OpenGL, and it has no special hardware-dependent features.

fScan was designed to provide the following:
- fast, flexible access to image data (in a wide variety of file formats)
- image and/or temporal filtering operations (e.g. reformatting, noise filtering, motion correction, etc.)
- statistical image processing operations (e.g. activation maps, region-of-interest statistics, etc.)
- automated tissue segmentation and 3-D surface reconstructions of the brain or other structures (Voyvodic et al., 2004).
- real-time fMRI analysis capabilities

The results can all be displayed immediately for interactive visualization, and/or they can be stored in disk files for additional processing or viewing at a later time.

Additional information on fScan's design features can be found at:
Real-time Analysis Interactive fMRI analysis in real-time and near-real-time
Combining data sets Aligning, transforming, and visualizing multiple data sets
Surface reconstruction Creating and visualizing 3-D surface data
Command line options Starting fScan
Interactive commands Run-time options
fScan Version 2 The 2nd generation of fScan