The NCI CBIIT instance of NBIA is an image repository that provides researchers with access to medical imaging libraries (also known as "collections") obtained from patients evaluated for multiple types of cancer (or, in one case, osteoarthritis). Images are stored in the Digital Imaging and Communications in Medicine (DICOM) standard and accompanied by image mark ups, annotations, and metadata. A wide range of imaging modalities is represented in the collections: computed radiography (CR), computed tomography (CT), digital radiography (DX), hard copy (HC), histopathology, magnetic resonance (MR), nuclear medicine (NM), ophthalmic photography (OP), presentation state (PR), positron emission tomography (PT), radiographic imaging (conventional film/screen) (RG), radiotherapy dose (RTDOSE), radiotherapy plan (RTPLAN), radiotherapy treatment record (RTRECORD), radiotherapy structure set (RTSTRUCT), secondary capture (SC), SR document, ultrasound (US), and X-ray angiography (XA).