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Bow-tie wobble artifact: Effect of source assembly motion on cone-beam CT
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Image of FIG. 1.
FIG. 1.

CBCT images of (a) a patient thorax, (b) a cylindrical water phantom centered in the FOV, and (c) an off-centered water phantom. (a) and (b) were reconstructed with our in-house software, and (c) was reconstructed with vendor software.

Image of FIG. 2.
FIG. 2.

Full-fan BTF symmetry axis shifts along U axis (perpendicular to gantry axis) as a function of gantry angle.

Image of FIG. 3.
FIG. 3.

The relative 2D trajectories of all three BBs on the detector superimposed with one another, with the 3 BB markers attached to the x-ray head cage window.

Image of FIG. 4.
FIG. 4.

(a) Superimposed average BB motion trajectories of some representative x-ray head assembly components as illustrated in (b). (b) The three levels of the x-ray head assembly the BBs were set to: (1) at the x-ray tube exit window, (2) at the U blades, and (3) at the back surface of the BTF.

Image of FIG. 5.
FIG. 5.

Images of the cylindrical water phantom before and after the BWA correction. (a) Simulated images incorporating the modeled BTF motion, (b) simulated images incorporating BTF motion but reconstructed following a translational correction to NP(U,V0) projection for each angle Eq. (3), (c) experimental images before BWA correction, (d) experimental images with measurement-based correction [angle-dependent normalization scans Eq. (2)], (e) experimental images with the model-based correction [the NP translation strategy Eq. (3)], (f) central profiles on the images (c)–(e).

Image of FIG. 6.
FIG. 6.

Along-ray filtration thickness plot of the full-fan BTF with its slope in relative units superimposed. The regions shaded in red show the portions of the filter corresponding to the BWA on reconstructed images.


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System description of one OBI system in our clinic following Cho et al. geometric calibration.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Bow-tie wobble artifact: Effect of source assembly motion on cone-beam CT