Encontrados 6 documentos, a visualizar página 1 de 1

Fast 3D reconstruction of the spine from biplanar radiographs using a deformabl...

This paper proposes a novel method for fast 3D reconstructions of the scoliotic spine from two planar radiographs. The method uses a statistical model of the shape of the spine for computing the 3D reconstruction that best matches the user input (about 7 control points per radiograph). In addition, the spine was modelled as an articulated structure to take advantage of the dependencies between adjacent vertebra...

Three-Dimensional Biplanar Reconstruction of the Scoliotic Spine for Standard C...

Scoliosis is characterized by a three-dimensional (3D) deformation of the spine that requires a 3D evaluation. However, conventional 3D imaging techniques have shown to be inadequate and, therefore, 3D reconstructions are typically performed from planar radiographs, one on the frontal plane and another on the lateral. Yet, this approach presents several challenges. The first is concerned with extracting 3D data...

Fast 3D reconstruction of the spine using user-defined splines and a statistica...

This paper proposes a method for rapidly reconstructing 3D models of the spine from two planar radiographs. For performing 3D reconstructions, users only have to identify on each radiograph a spline that represents the spine midline. Then, a statistical articulated model of the spine is deformed until it best fits these splines. The articulated model used on this method not only models vertebrae geometry, but t...

Calibration of bi-planar radiography with a rangefinder and a small calibration...

In this paper we propose a method for geometrical calibration of bi-planar radiography that aims at minimising the impact of calibration objects on the content of radiographs, while remaining affordable. For accomplishing this goal, we propose a small extension to conventional imaging systems: a low-cost rangefinder that enables to estimate some of the geometrical parameters. Even with this extension, a small c...

Calibration of bi-planar radiography with minimal phantoms

In this paper we propose a method for the geometrical calibration of bi-planar radiography that aims at minimising the impact of calibration phantoms on the content of radiographs. These phantoms are required for determining scale or to estimate the geometrical parameters of the system. Unfortunately, they often overlap anatomical structures. For accomplishing this goal, we propose a small extension to conventi...

Fighting fire with fear