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Fig 4. A series of pictures used for area measurement on pigs 6 (upper row) and 7 (lower row). A coronal section of brain images (A and B) obtained with the C-arm CT system shows a high-attenuation mass within brain parenchyma. The high-attenuation areas are polarized and digitally selected as a red mass by ImageJ software (C and D). Coronal sections of brain images obtained with conventional CT (E and F) show intracranial hematoma as a prominent high-attenuation mass. These high-attenuation areas are measured by ImageJ software after polarization (G and H). Harvested necropsied brains reveal intracranial hematoma (I and J). The hematoma areas are measured by ImageJ software with the same technique as used in the measurement of hematoma area of C-arm CT and conventional CT (K and L).
