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Fig. 1 | Chinese Neurosurgical Journal

Fig. 1

From: ABC/2 formula for “bedside” postoperative pneumocephalus volume measurement

Fig. 1

Axial postoperative CT brain scan of cSDH with pneumocephalus. For the ABC/2 method, “A” was defined as the largest longitudinal linear length of the pneumocephalus on the axial plane, “B” was the maximum width from the inner table of the skull to the cerebral cortex perpendicular to A on the same slice (upper), and “C” was the height of the pneumocephalus on a coronal plane, as determined by multiplying the number of CT scan slides with the pneumocephalus visible by the slice thickness (in this study, 5 millimetres (mm) in thickness). The estimated volume was a multiple of A, B, and C and then divided by 2. For the computer-assisted pneumocephalus volumetric measurement, semiautomatic segmentation was traced in each slice for computer-assisted volume calculation (lower) and 3D reconstruction of the pneumocephalus for visualization

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