title: A BPF-type algorithm for CT with a curved PI detector.
abstract: Helical cone-beam CT is used widely nowadays because of its rapid scan speed and efficient utilization of x-ray dose. Recently, an exact reconstruction algorithm for helical cone-beam CT was proposed (Zou and Pan 2004a Phys. Med. Biol. 49 941-59). The algorithm is referred to as a backprojection-filtering (BPF) algorithm. This BPF algorithm for a helical cone-beam CT with a flat-panel detector (FPD-HCBCT) requires minimum data within the Tam-Danielsson window and can naturally address the problem of ROI reconstruction from data truncated in both longitudinal and transversal directions. In practical CT systems, detectors are expensive and always take a very important position in the total cost. Hence, we work on an exact reconstruction algorithm for a CT system with a detector of the smallest size, i.e., a curved PI detector fitting the Tam-Danielsson window. The reconstruction algorithm is derived following the framework of the BPF algorithm. Numerical simulations are done to validate our algorithm in this study.
authors.affiliation: Department of Engineering Physics, Tsinghua University, Bejing 100084, People's Republic of China.
authors.forename: Jie
authors.initials: J
authors.lastname: Tang
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Chen
authors.forename: Yuxiang
authors.initials: Y
authors.lastname: Xing
authors.forename: Jianping
authors.initials: J
authors.lastname: Cheng
mesh_terms: D000465:Algorithms; D019544:Equipment Failure Analysis; D021621:Imaging, Three-Dimensional / Q000379:methods*; D016247:Information Storage and Retrieval / Q000379:methods; D011856:Radiographic Image Enhancement / Q000379:methods*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D036542:Tomography, Spiral Computed / Q000295:instrumentation* / Q000379:methods*; D014159:Transducers