title: Hematoma volumes of spontaneous intracerebral hemorrhage: the ellipse (ABC/2) method yielded volumes smaller than those measured using the planimetric method.
abstract: 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 using the 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 cm3 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.
authors: Postgraduate Health Technology Program, Pontifical Catholic University of Paraná, Curitiba PR, Brazil.
authors: Adriano Keijiro
authors: AK
authors: Maeda
authors: Luiz Roberto
authors: LR
authors: Aguiar
authors: Carolina
authors: C
authors: Martins
authors: Gerson Linck
authors: GL
authors: Bichinho
authors: Munir Antônio
authors: MA
authors: Gariba
mesh_terms: D002543:Cerebral Hemorrhage / Q000000981:diagnostic imaging*; D006406:Hematoma / Q000000981:diagnostic imaging*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D015588:Observer Variation; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012720:Severity of Illness Index; D014057:Tomography, X-Ray Computed