Title :
Cone-beam projection of a deformable volume for motion compensated algebraic reconstruction
Author :
Rit, S. ; Sarrut, D.
Author_Institution :
Univ. Lumiere Lyon 2, Bron
Abstract :
The cone-beam tomographic projection and the deformation of a discrete volume are problems that have generally been studied separately. They are combined in some applications such as motion compensated algebraic reconstruction. In this paper, we propose two methods to compute the cone-beam projections of a volume deformed with a known motion. The first method is based on an inverse mapping between the reference 3D volume and the 2D cone-beam projection and the second method on a forward mapping. Both methods were evaluated on a dynamic digital phantom and confronted to another method. The quality of the cone-beam projections was increased by 70% with both methods compared to the projection obtained without including the motion model. The proposed methods yield accurate linear equations, the first step before tomographic reconstruction of the deformable volume with algebraic methods.
Keywords :
computerised tomography; deformation; image reconstruction; linear algebra; medical image processing; motion compensation; phantoms; 2D cone-beam projection; 3D volume; CT image; deformable volume; dynamic digital phantom; forward mapping; inverse mapping; linear equations; motion compensated algebraic reconstruction; tomographic reconstruction; Biomedical imaging; Computed tomography; Deformable models; Equations; Image processing; Image reconstruction; Imaging phantoms; Pixel; Thorax; Volume measurement; Humans; Motion; Phantoms, Imaging; Radiographic Image Interpretation, Computer-Assisted; Respiration; Thorax; Tomography, X-Ray Computed;
Conference_Titel :
Engineering in Medicine and Biology Society, 2007. EMBS 2007. 29th Annual International Conference of the IEEE
Conference_Location :
Lyon
Print_ISBN :
978-1-4244-0787-3
DOI :
10.1109/IEMBS.2007.4353859