title: Use of free-hand three-dimensional ultrasound software in the study of the fetal heart.
abstract: OBJECTIVE
  To propose a new approach to the study of the fetal heart using free-hand three-dimensional (3D) ultrasound software.
  
  
  METHODS
  We studied a total of 28 fetuses, of which 26 were normal and two were known to have heart pathology. In all of them a B-mode scan was performed. After obtaining a four-chamber view, and keeping the transducer in the same position, the free-hand 3D-View software was activated. A sequence of frames was stored. Additional information was recorded looking from the four-chamber view towards the outflow tract, and also adding color Doppler.
  
  
  RESULTS
  We obtained a multiplanar display of one B-mode and two perpendicular M-modes in all cases studied. In this multiplanar mode, Y and X axes represent distance and Z axis represents time. We were able to obtain M-modes and a variation of color-M-mode in any desired position. Moving the information along the Z axis, a frame sequence of the B-mode was obtained. Using this approach we observed one case of fetal supraventricular extrasystoles and other having an interventricular septum defect.
  
  
  CONCLUSIONS
  This modality gives a new perspective of fetal heart scanning using the free-hand 3D-View software, in which there is benefit from many of the advantages of the 3D software, although the power of this procedure must be improved.
authors.affiliation: Department of Obstetrics and Gynecology, Facultad de Medicina, Universidad Austral de Chile, PO. BOX 567, Valdivia, Chile.
authors.forename: F A
authors.initials: FA
authors.lastname: Guerra
authors.forename: A I
authors.initials: AI
authors.lastname: Isla
authors.forename: R C
authors.initials: RC
authors.lastname: Aguilar
authors.forename: E G
authors.initials: EG
authors.lastname: Fritz
mesh_terms: D005315:Fetal Diseases / Q000000981:diagnostic imaging; D005318:Fetal Heart / Q000000981:diagnostic imaging*; D006345:Heart Septal Defects, Ventricular / Q000000981:diagnostic imaging; D006801:Humans; D007091:Image Processing, Computer-Assisted; D012984:Software; D018615:Ultrasonography, Doppler, Color / Q000379:methods; D016216:Ultrasonography, Prenatal / Q000379:methods*; D018879:Ventricular Premature Complexes / Q000000981:diagnostic imaging