Fig 1.
A. Preoperative axial CT-scan with both sided subdural hematomas (SDH). Computer-assisted volumetric measurement was performed by hand tracing each hematoma form in each slice as shown in red and orange colour. ABC/2 measurement technique was performed as following: A is the length connected each corner of the SDH, B is 90° to A and C is the height calculated by the slice thickness with visible hematoma. B. 3D frontal reconstruction of computer-assisted volumetric measurement of both sided SDH. C. 3D lateral reconstruction of computer-assisted volumetric measurement of single sided SDH.
Fig 2.
A. Pearson Linear regression analysis between ABC/2 and computer-assisted volumetric measurement. B. Bland-Altman regression analysis between log of ABC/2 and log of computer-assisted volumetric measurement.
Fig 3.
Mathematical derivation of the ABC/2 formula from a half ellipsoid volumetric formula.