The Image Resend process prevents images from being archived multiple times. It protects the database from storing duplicate images and assures that the stored image represents the latest version received by the database.
Images are usually added to the database as part of a study. Individual images can later be retrieved from online storage, manipulated, and returned to storage. When the image is returned to storage, it overrides the older image.
Before an individual image is added to the database, a cross-reference check is performed to determine whether an image with the same SOP instance UID already resides in the Workflow Manager database. If such an image is found, the Workflow Manager verifies that the incoming image and the stored image have the same series instance UID and study instance UID. Only after this verification does the incoming image override the older image. If a difference is found in one of the SOP instances, the image is rejected.