Truncation correction for oblique filtering lines
Hoppe S, Hornegger J, Lauritsch G, Dennerlein F, Noo F (2008)
Publication Type: Journal article, Original article
Publication year: 2008
Journal
Original Authors: Hoppe S., Hornegger J., Lauritsch G., Dennerlein F., Noo F.
Publisher: American Association of Physicists in Medicine
Book Volume: 35
Pages Range: 5910-5920
Journal Issue: 12
DOI: 10.1118/1.3002416
Abstract
State-of-the-art filtered backprojection (FBP) algorithms often define the filtering operation to be performed along oblique filtering lines in the detector. A limited scan field of view leads to the truncation of those filtering lines, which causes artifacts in the final reconstructed volume. In contrast to the case where filtering is performed solely along the detector rows, no methods are available for the case of oblique filtering lines. In this work, the authors present two novel truncation correction methods which effectively handle data truncation in this case. Method 1 (basic approach) handles data truncation in two successive preprocessing steps by applying a hybrid data extrapolation method, which is a combination of a water cylinder extrapolation and a Gaussian extrapolation. It is independent of any specific reconstruction algorithm. Method 2 (kink approach) uses similar concepts for data extrapolation as the basic approach but needs to be integrated into the reconstruction algorithm. Experiments are presented from simulated data of the FORBILD head phantom, acquired along a partial-circle-plus-arc trajectory. The theoretically exact M-line algorithm is used for reconstruction. Although the discussion is focused on theoretically exact algorithms, the proposed truncation correction methods can be applied to any FBP algorithm that exposes oblique filtering lines. © 2008 American Association of Physicists in Medicine.
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APA:
Hoppe, S., Hornegger, J., Lauritsch, G., Dennerlein, F., & Noo, F. (2008). Truncation correction for oblique filtering lines. Medical Physics, 35(12), 5910-5920. https://doi.org/10.1118/1.3002416
MLA:
Hoppe, Stefan, et al. "Truncation correction for oblique filtering lines." Medical Physics 35.12 (2008): 5910-5920.
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