# AIR (program)

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The **AIR** (*Automated Image Registration*) is a program suite for volume-based [image registration](/source/Image_registration) constructed by [Roger P. Woods](/source/Roger_P._Woods) from [UCLA School of Medicine](/source/UCLA_School_of_Medicine). It reads and writes [Analyze](/source/Analyze_(imaging_software)) volume files and can work with 4x4 [transformation matrices](/source/Transformation_matrix) stored in its own file format with the [filename extension](/source/Filename_extension) .air.

It is especially designed for [neuroimaging](/source/Neuroimaging) applications and has primarily been used in research-oriented [functional neuroimaging](/source/Functional_neuroimaging) with brain scans from [positron emission tomography](/source/Positron_emission_tomography) and [magnetic resonance](/source/Magnetic_resonance_imaging) scanners.

The suite provides a number of programs for image registration with different transformation models, such as rigid-body, affine and nonlinear [warping](/source/Image_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](http://air.bmap.ucla.edu/AIR5/) — homepage for the fifth version of the program suite

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Adapted from the Wikipedia article [AIR (program)](https://en.wikipedia.org/wiki/AIR_(program)) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/AIR_(program)?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.