This class contains those attributes and associations common to both Radiology / Nuclear Medicine imaging examinations and the scanning of paper documents into an image storage and retrieval system. Historically, both diagnostic imaging and the scanning and retrieval of paper documents have been included in the "imaging" domain as they both share certain characteristics in terms of the equipment used to store and retrieve the images. Yet a distinction is often made with respect to the amount and type of metadata associated with the images. For example, "Diagnostic Images" are those stored and retrieved in Picture Archive and Communications Systems (PACS) which require certain codified information regarding the modality of the image, body site, etc., and are organized into Studies, Series, Images, and subsets (regions) of images. In contrast, scanned documents do not require any of these metadata. As patient-generated images become more commonplace, we foresee a need to store these images (for example, a patient uses a smart phone to take a picture of a wound and emails it to a clinician) as well. We would foresee such images stored in the "Medical Imaging Event" hierarchy, even if a relatively-empty Study and Series construct would be required to contain such images. However, scanned documents simply need a pointer to the resulting image(s), and we therefore find it useful to continue with a logical separation of the two kinds of images.