Hematoma volumes of spontaneous intracerebral hemorrhage: the ellipse (ABC/2) method yielded volumes smaller than those measured using the planimetric method

Objective: To compare two different methods for measuring intracerebral hemorrhage (ICH) volume: the ellipse volume (called ABC/2), and the software-aided planimetric. Methods: Four observers evaluated 20 brain computed tomography (CT) scans with spontaneous ICH. Each professional measured the volume usingthe ABC/2 and the planimetric methods. The average volumes were obtained, and the intra- and inter-rater variability was determined. Results: There is an absolute 2.24 cm(3) average difference between both methodologies. Volumes yielded by the ABC/2 method were as much as 14.9% smaller than by the planimetric one. An intra-observer variability rate of 0.46% was found for the planimetric method and 0.18% for the ABC/2. The inter-observer rates were 1.69 and 1.11% respectively. Conclusions: Both methods are reproducible. The ABC/2 yielded hemorrhage volumes as much as 14.9% smaller than those measured using the planimetric methodology.