Before starting contour definitions it is recommended to first locate the slice of interest, zoom and pan, so that the structures to be delineated are clearly seen. Also, it should be decided which of the orientations is best suited for the outlining.
VOIs for Dynamic Studies
Often the anatomical information in dynamic studies is not sufficient to delineate VOIs. In some cases, averaging of a part of the acquisitions provides a clearer picture. A quick way for time-averaging is to select the tools tab and average some frames without replacing the study.
Another method is to define the VOIs using matched anatomical images of the same subject. Such a set of VOIs can then be applied to the dynamic study for calculating time-activity curves.
Using Multiple Files Simultaneously
When multiple images have been loaded (or additional ones have been created by averaging frames as shown above), each of them has its own set of VOIs. The image series and the VOIs can be switched using the selection at the top
Please note the synchronization box VOIs from. If it is checked, the studies and the VOIs can be selected independently from each other. If it is not checked, each study uses its own VOIs, and the VOI selection is not active.
CAUTION: If VOIs are to be defined in one study and used in another, the two studies must be matched beforehand, meaning that both of them have the image origin at exactly the same anatomical location. This type of matching can be performed with the PMOD Image Fusion tool.