.dcm Digital Imaging and Communications in Medicine (DICOM) image
This is an international format that was developed for the purpose of storing images of the body taken with medical imaging equipment. It includes magnetic resonance and computer tomography images, ultrasound images and fluoroscopy, as well as images taken with other medical imaging equipment. DCM also stores patient information in the metadata, which form part of a single file.
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You can use it on electronic devices such as computers, tablets, and mobile phones.