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AIR (program)
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<p>The AIR (<i>Automated Image Registration</i>) is a program suite for volume-based <a href="/facts/Image_registration/y2KUwdRL">image registration</a> constructed by Roger P. Woods from <a href="/facts/UCLA_School_of_Medicine/Jcb7PApE">UCLA School of Medicine</a>. It reads and writes <a href="/facts/Analyze_(imaging_software)/PvcBvWKa">Analyze</a> volume files and can work with 4x4 <a href="/facts/Transformation_matrix/qAwPXmpR">transformation matrices</a> stored in its own file format with the <a href="/facts/Filename_extension/cJgfAym4">filename extension</a> .air. </p><p>It is especially designed for <a href="/facts/Neuroimaging/dA5Cteaf">neuroimaging</a> applications and has primarily been used in research-oriented <a href="/facts/Functional_neuroimaging/r0k8tKGR">functional neuroimaging</a> with brain scans from <a href="/facts/Positron_emission_tomography/5SmcW6qz">positron emission tomography</a> and <a href="/facts/Magnetic_resonance_imaging/Vh9yG9qq">magnetic resonance</a> scanners. </p><p>The suite provides a number of programs for image registration with different transformation models, such as rigid-body, affine and nonlinear <a href="/facts/Image_warping/aBqtwJNu">warping</a>. For example, for affine transformation the registration from one brain scan to another may be found with the <i>alignlinear</i> program and written to the special air-file that stores the transformation matrix. The transformation may be inverted with the <i>invert_air</i> program and the volume may finally be resliced and interpolated with the <i>reslice</i> program. </p>