 Load referential information from file header | ||
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| Prev | Chapter 4. Handling referentials and transformations | Next |
| Load referential information from file header | ||
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| Prev | Chapter 4. Handling referentials and transformations | Next |
The option Referential => Load information from file header extract information about referentials and transformations that is stored in the image files. Indeed, some formats like Analyze and Nifti enable to store this kind of information. Theses transformations are not applied automatically by anatomist by default, but it is possible to change that in Settings => Preferences => Volume.
Fusion between an anatomical volume and an activation map
Load:
data_for_anatomist/subject01/subject01.niidata_for_anatomist/subject01/Audio-Video_T_map.niiFusion the 2 images.Not that they are not well superimposed because they are not in the same referential. But they are in Nifti format and contains information about a transformation to the referential Talairach-MNI Template-SPM.
For each volume, right-click the Referential => Load information from file header.
Look at the fusion, the 2 images are now well superimposed.
Change the point of view by changing the referential of the window: click on the colored bar at the top of the window and choose Talairach-MNI Template-SPM. Notice the change of orientation.
Note about SPM2: it can use a .mat file to store the origin information, so the information in the regular Analyze header is not always reliable. Anatomist cannot read .mat (matlab) files, but .trm files. To convert the .mat file to .trm, and then load a transformation.
Note about SPM5: In this example, the 2 images contain information about the transformation to a common referential Talairach-MNI template-SPM. Be careful, this information is not in all images and the destination referential is not always the same. SPM5 for example, doesn't always set this normalized MNI template referential as the destination referential when it normalizes an image. In this case, Anatomist creates to different destination referential. To indicate that these referentials are equal, you can put an identity transformation between the 2 referentials: draw a line with the mouse between the 2 referentials while pressing Ctrl key.
