Background: This paper presents a method that registers MRIs acquired in prone position, with surface topography\r\n(TP) and X-ray reconstructions acquired in standing position, in order to obtain a 3D representation of a human torso\r\nincorporating the external surface, bone structures, and soft tissues.\r\nMethods: TP and X-ray data are registered using landmarks. Bone structures are used to register each MRI slice using\r\nan articulated model, and the soft tissue is confined to the volume delimited by the trunk and bone surfaces using a\r\nconstrained thin-plate spline.\r\nResults: The method is tested on 3 pre-surgical patients with scoliosis and shows a significant improvement,\r\nqualitatively and using the Dice similarity coefficient, in fitting the MRI into the standing patient model when\r\ncompared to rigid and articulated model registration. The determinant of the Jacobian of the registration deformation\r\nshows higher variations in the deformation in areas closer to the surface of the torso.\r\nConclusions: The novel, resulting 3D full torso model can provide a more complete representation of patient\r\ngeometry to be incorporated in surgical simulators under development that aim at predicting the effect of scoliosis\r\nsurgery on the external appearance of the patient�s torso.
Loading....