Details

Autor(en) / Beteiligte

• Preuhs, Alexander
• Maier, Andreas
• Manhart, Michael
• Kowarschik, Markus
• Hoppe, Elisabeth
• Fotouhi, Javad
• Navab, Nassir
• Unberath, Mathias

Titel

Symmetry prior for epipolar consistency

Ist Teil von

• International journal for computer assisted radiology and surgery, 2019-09, Vol.14 (9), p.1541-1551

Ort / Verlag

Cham: Springer International Publishing

Erscheinungsjahr

2019

Quelle

MEDLINE

Beschreibungen/Notizen

• Purpose For a perfectly plane symmetric object, we can find two views—mirrored at the plane of symmetry—that will yield the exact same image of that object. In consequence, having one image of a plane symmetric object and a calibrated camera, we automatically have a second, virtual image of that object if the 3-D location of the symmetry plane is known. Methods We propose a method for estimating the symmetry plane from a set of projection images as the solution of a consistency maximization based on epipolar consistency. With the known symmetry plane, we can exploit symmetry to estimate in-plane motion by introducing the X-trajectory that can be acquired with a conventional short-scan trajectory by simply tilting the acquisition plane relative to the plane of symmetry. Results We inspect the symmetry plane estimation on a real scan of an anthropomorphic human head phantom and show the robustness using a synthetic dataset. Further, we demonstrate the advantage of the proposed method for estimating in-plane motion using the acquired projection data. Conclusion Symmetry breakers in the human body are widely used for the detection of tumors or strokes. We provide a fast estimation of the symmetry plane, robust to outliers, by computing it directly from a set of projections. Further, by coupling the symmetry prior with epipolar consistency, we overcome inherent limitations in the estimation of in-plane motion.