Affiliations: Department of Biomedical Engineering, Shanghai Jiao
Tong University, Shanghai, 200240, China | Department of Electrical and Computer Engineering,
University of Iowa, Iowa City, IA 52242, USA | Biomedical Imaging Division, VT-WFU School of
Biomedical Engineering, Virginia Tech, Blacksburg, VA 24061, USA
Note: [] Corresponding author: Jun Zhao, Department of Biomedical
Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China. E-mail:
junzhao@sjtu.edu.cn
Abstract: Bolus-chasing CT angiography is an important new imaging mode for
imaging cardiovascular structures and peripheral vessels. The adaptive
bolus-chasing method implies a variable pitch spiral cone-beam CT scan. In this
paper, we extend 2D-weighted, 3D-weighted and tilted plane FDK algorithms for
variable pitch spiral cone-beam CT. Numerical simulation tests with high
pitches and large cone angles are performed. Our results demonstrate that the
tilted plane Feldkamp-type reconstruction algorithm shows the highest tolerance
to the data incompleteness, the 3D-weighted half-scan FDK algorithm is the best
choice for the practical variable pitch cone-beam CT, and the exact
reconstruction algorithms perform less satisfactorily when a dataset is
incomplete. However, the exact algorithms can be used for high accuracy
reconstruction offline if a dataset is complete. Our work may facilitate
development of practical variable pitch helical cone-beam CT.
