Chord-based image reconstruction in cone-beam CT with a curved detector

Journal Article · Sun Oct 15 04:00:00 EDT 2006 · Medical Physics

DOI:https://doi.org/10.1118/1.2337270· OSTI ID:20853595

Nianming, Zuo; Dan, Xia; Yu, Zou; Tianzi, Jiang; Xiaochuan, Pan ^[1]

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1. National Laboratory of Pattern Recognition, Institute of Automation, Chinese Academy of Sciences, Beijing 100080 (China)

Modern computed tomography (CT) scanners use cone-beam configurations for increasing volume coverage, improving x-ray-tube utilization, and yielding isotropic spatial resolution. Recently, there have been significant developments in theory and algorithms for exact image reconstruction from cone-beam projections. In particular, algorithms have been proposed for image reconstruction on chords; and advantages over the existing algorithms offered by the chord-based algorithms include the high flexibility of exact image reconstruction for general scanning trajectories and the capability of exact reconstruction of images within a region of interest from truncated data. These chord-based algorithms have been developed only for flat-panel detectors. Many cone-beam CT scanners employ curved detectors for important practical considerations. Therefore, in this work, we have derived chord-based algorithms for a curved detector so that they can be applied to reconstructing images directly from data acquired by use of a CT scanner with a curved detector. We have also conducted preliminary numerical studies to demonstrate and evaluate the reconstruction properties of the derived chord-based algorithms for curved detectors.

• OSTI ID: 20853595
• Journal Information: Medical Physics, Journal Name: Medical Physics Journal Issue: 10 Vol. 33; ISSN 0094-2405; ISSN MPHYA6
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
ALGORITHMS
BEAMS
COMPUTERIZED TOMOGRAPHY
FLEXIBILITY
IMAGE PROCESSING
IMAGE SCANNERS
IMAGES
NOISE
SPATIAL RESOLUTION
X-RAY TUBES