MPR, MIP, and 3D analysis is done in a separate, integrated application called Volume Viewing. You can open series into Volume Viewing by clicking the Volume Viewing tool in the Image area. Among the tasks you can perform in the Volume Viewing application are:
Real-time multiplanar reformatting of images into linear or curved plane
Maximum intensity projections of images and slice thickness changes
Non-invasive virtual endoscopy
3D volume measurements
Rapid sculpting and bone removal
For details on using the tools and menus in the Volume Viewing application, refer to the Volume Viewing documentation.