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(A) Annotation in DICOM format requires differentiation between several non-cardiac structures with HU > 130 such as the vertebrae and sternum (red), and cardiac calcium (green). (B) and ×15 magnification, (C) The colored annotation in DICOM format is extracted using color-based K-means clustering. Abbreviations: DICOM = Digital Imaging and Communications in Medicine, HU = Hounsfield units.
