Wahle A, Wellnhofer E, Oswald H, Fleck E:


Biplane Coronary Angiography: Accurate Quantitative 3-D Reconstruction without Isocenter.

Computers in Cardiology 1993, London UK, IEEE-CS Press

Page 97-100, 1993

Description of the Imaging Geometry Analysis and Approximation System based on the different error types; introduction of the iso-axis model delivering one more degree of freedom than the isocentric geometry model, biplane calibration (Images) (Links)

Abstract: Exact knowledge on the morphology of coronary vessel systems is of increasing importance for clinical applications. The quantification of morphologic vessel parameters is an essential aid in diagnosis, therapy planning and verification of surgical results. 3-D recon struction from biplane angiograms is well suited for these purposes.

Most of the present reconstruction systems assume a fixed isocenter, which does not reflect the real conditions. Even if the devices were adjusted by special phantoms, the systems may shift during angulation. Mechanical solutions of this problem would be complex and expensive. Handling the diffuse isocenter problem just by a generalized intersection point cannot deliver sufficient results for quantitative evaluations.

In our new approach presented here, we dropped the assumption of a stable isocenter and considered the real mechanical properties of biplane imaging systems.