title: Data correction for gantry-tilted local CT.
abstract: The gantry-tilted helical cone-beam computed tomography (CT) has an inherent problem that the relative shift of the region of interest (ROI) blurs the reconstructed image. This problem becomes more serious in the gantry-tilted local CT imaging due to the nature of local scanning. This paper proposes a new method to improve the gantry-tilted local imaging by correcting the local scanning data. Computer simulations show that the proposed method can enhance the local imaging performance to a certain extent in terms of the image sharpening and artifacts reduction.
authors.affiliation: School of Electrical and Electronic Engineering, BLK S2, Nanyang Technological University, Singapore 639798, Singapore.
authors.forename: Hongzhu
authors.initials: H
authors.lastname: Liang
authors.forename: Cishen
authors.initials: C
authors.lastname: Zhang
authors.forename: Ming
authors.initials: M
authors.lastname: Yan
mesh_terms: D000465:Algorithms; D016477:Artifacts; D003198:Computer Simulation; D006257:Head / Q000000981:diagnostic imaging*; D006801:Humans; D019047:Phantoms, Imaging; D011187:Posture; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000379:methods*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D036542:Tomography, Spiral Computed / Q000379:methods*