Important: Do not apply Register Studies to studies containing non-volumetric datasets. The registration algorithm is designed for use on volumetric datasets only. For more information about volume rendered images, see Using Volume Rendering.
Register Studies is best suited for general registration or global level registration.
The Register Studies tool applies an algorithm to the datasets in a study. The algorithm matches any two volumes from two studies, and automatically maps each pixel in one study to the relevant pixel in the other study.
1. Display two or more studies containing volumetric datasets.
2. Click Register Studies 
to view the drop-down menu.
3. Click Register Studies . The cursor changes to Automatic Registration mode.
4. Click the volumetric groups or series in each study.
If you click on a group more than once, the Register Studies function waits until you click, or choose, another group.
When you click on the same general location in each study, you create a registration point. The registration points are factored into the registration algorithm. The Register Studies tool applies an algorithm to the datasets in a study.
The algorithm matches the volumes from two or more studies, and automatically maps each pixel in one study to the relevant pixel in the other study.
Important: If you need to compare specific regions in each study, use Refine Registration.
See these topics:
Unsatisfactory Registration Results