Correction of Breathing Motion in the Thorax for Helical CT

作     者：Thomas Khler Tobias Klinder Udo van Stevendaal Cristian Lorenz Peter Forthmann 

作者机构：Philips Research Europe-HamburgRontgenstrasse 24-26HamburgGermany Institut für InformationsverarbeitungLeibniz University HannoverHannover 30167Germany 

出 版 物：《Tsinghua Science and Technology》 (清华大学学报（自然科学版（英文版）)

年 卷 期：2010年第15卷第1期

页      面：87-95页

核心收录：

学科分类：08[工学] 080203[工学-机械设计及理论] 0802[工学-机械工程] 

主　　题：computed tomography (CT) motion compensation reconstruction respiratory motion 

摘      要：This paper investigates a reconstruction method for helical computed tomography which compensates for the motion artifacts in the thorax caused by patient breathing. The method takes into account a motion vector field determined from a four-dimensional （4-D） uncompensated image data set. Surface models of the lung and the ribs are tracked through the 4-D data set to create motion information within the entire thorax. Finally, an image is reconstructed using motion compensated back-projection. The results show that due to the use of shape models for the motion estimation, the method is fast and robust. Furthermore, since the surfaces are tracked individually, reconciling the opposite motion direction of the lung and rib cage in one motion vector field is avoided.