AIR (program)
Encyclopedia
AIR 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 4x4 transformation matrices stored in its own file format with the filename extension
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.
Image registration
Image registration is the process of transforming different sets of data into one coordinate system. Data may be multiple photographs, data from different sensors, from different times, or from different viewpoints. It is used in computer vision, medical imaging, military automatic target...
constructed by Roger P. Woods from UCLA School of Medicine.
It reads and writes Analyze volume files and can work with 4x4 transformation matrices stored in its own file format with the filename extension
Filename extension
A filename extension is a suffix to the name of a computer file applied to indicate the encoding of its contents or usage....
.air.It is especially designed for neuroimaging
Neuroimaging
Neuroimaging includes the use of various techniques to either directly or indirectly image the structure, function/pharmacology of the brain...
applications and has primarily been used in research-oriented functional neuroimaging
Functional neuroimaging
Functional neuroimaging is the use of neuroimaging technology to measure an aspect of brain function, often with a view to understanding the relationship between activity in certain brain areas and specific mental functions...
with brain scans from positron emission tomography
Positron emission tomography
Positron emission tomography is nuclear medicine imaging technique that produces a three-dimensional image or picture of functional processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide , which is introduced into the body on a...
and magnetic resonance
Magnetic resonance
Magnetic resonance can mean:*Nuclear magnetic resonance*Electron spin resonance*Magnetic resonance imaging *Functional magnetic resonance imaging *Muon spin spectroscopy...
scanners.
The suite provides a number of programs for image registration with different transformation models, such as rigid-body, affine and nonlinear warping
Image warping
Image warping is the process of digitally manipulating an image such that any shapes portrayed in the image have been significantly distorted. Warping may be used for correcting image distortion as well as for creative purposes...
.
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