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A fast and efficient method for sequential cone‐beam tomography
Author(s) -
Köhler Th.,
Proksa R.,
Grass M.
Publication year - 2001
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1395025
Subject(s) - rotation (mathematics) , cone (formal languages) , position (finance) , scanner , iterative reconstruction , beam (structure) , tomography , computer vision , object (grammar) , point (geometry) , cone beam ct , mathematics , computer science , optics , artificial intelligence , geometry , algorithm , physics , computed tomography , medicine , finance , economics , radiology
Sequential cone‐beam tomography is a method that uses data of two or more parallel circular trajectories of a cone‐beam scanner to reconstruct the object function. We propose a condition for the data acquisition that ensures that all object points between two successive circles are irradiated over an angular span of the x‐ray source position of exactly 360° in total as seen along the rotation axis. A fast and efficient approximative reconstruction method for the proposed acquisition is presented which uses data from exactly 360° for every object point. It is based on the Tent‐FDK method which was recently developed for single circular cone‐beam CT. The measurement geometry does not provide sufficient data for exact reconstruction but it is shown that the proposed reconstruction method provides satisfying image quality for small cone angles.