The AIR (Automated Image Registration) is a program suite for volume-based image registration constructed by Roger P. Woods from UCLA School of Medicine.
It reads and writes Analyze volume files and can work with 4×4 transformation matrices stored in its own file format with the filename extension .air.
It is especially designed for neuroimaging applications and has primarily been used in research-oriented functional neuroimaging with brain scans from positron emission tomography and magnetic resonance scanners.
The suite provides a number of programs for image registration with different transformation models, such as rigid-body, affine and nonlinear warping. For example, for affine transformation the registration from one brain scan to another may be found with the alignlinear program and written to the special air-file that stores the transformation matrix. The transformation may be inverted with the invert_air program and the volume may finally be resliced and interpolated with the reslice program.
External links
- Automated Image Registration — homepage for the fifth version of the program suite