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Before starting contour definitions it is recommended to first take the time to locate the slice of interest, zoom and pan, so that the structures to be delineated are clearly seen.

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 in matched anatomical images of the same patient. Such a set of VOIs can then be applied to the dynamic study to derive 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, each study uses its own VOIs, and the VOI selection is not active. To arbitrarily select the VOIs or to use the same VOI for multiple studies please remove the check as illustrated above.

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.