The DICOM file header consists of a 128-byte file preamble, followed by a 4-byte DICOM prefix. A DICOM file comprises a file format definition and a network communications protocol. Digital Imaging and Communications in Medicine (DICOM) is an international standard for transmitting, storing, retrieving, printing, and displaying medical imaging information, such as X-ray, CT scans, MRIs, and ultrasound.
