Sentence examples for ring artefacts from inspiring English sources
Reconstruction artefacts, such as streak or ring artefacts, aggravate the filtering process so algorithms performing well with random noise are not guaranteed to provide satisfactory results for X-ray tomography reconstructions.
The system error of CT (in HU) can be eliminated by re-calibration with a water phantom, and other effects such as ring artefacts and beam-hardening effects can be well controlled and suppressed with proper reconstruction algorithms.
The Recon software was also used to further correct ring artefacts and beam hardening.
Reconstruction parameters, including smoothing (1), ring artefacts reduction (4), and beam-hardening correction (30%), were fixed for all the samples.
Ring artefacts on reconstructed tomographic slices at 2.8 µm were removed by using a specific automatic script developed by P.T. for the Photoshop 7.0 software (Adobe system, Inc., San Jose, California, USA) [35], [36].
The rotation tomography table incorporates a linear translation mechanism to eliminate ring artefact that is commonly associated with third-generation tomography systems.
This ring artefact with under- and overshoot appears like the Gibbs phenomenon.
CT images were reconstructed with a 0.169-mm 0.169-mmid, using NRecon (SkyScan, Kontich, Belgium) with its built-in modified Feldkamp algorithm and methods for beam hardening and ring artefact corrections.
It should be noted however that CDR compensation may create ringing artefacts which change the distribution of counts within a volume of interest (VOI) [11].
The Gibbs phenomenon provides another example where spurious peaks appear in a FT. It occurs at points of discontinuity in a periodic function, and results in so-called ringing artefacts around the "true" frequency peak [ 4].
In addition, the findings might have been caused by unrecognized susceptibility, motion, or ringing artefacts, difficult to distinguish from perfusion deficits despite use of rest perfusion images as in reference [ 11].
