Reconstruction algorithm for polychromatic CT imaging: application to beam hardening correction

Yan, Chye Hwang; Whalen, Robert T.; Beaupré, Gary S.; Yen, Shin Y.; Napel, Sandy

doi:10.1109/42.832955

Cited by 106 publications

(35 citation statements)

References 17 publications

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“…Beam hardening effects in a fixed voltage are known to be one of the major sources of deterministic error. During recent decades, a number of correction methods have been developed, including physical approach, statistics approach, linearization, spectrum estimation, phantom calibration prereconstruction, threshold segmentation reprojection, and iteration method [3–9]. However, artifact correction in the case of tube modulation during a CT scan has been primarily addressed in the literature.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Calibration Phantoms for CT Scanners with Tube Voltage Modulation

Jing

2013

International Journal of Biomedical Imaging

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The effects of calibration phantoms on the correction results of the empirical artifacts correction method (ECCU) for the case of tube modulation were investigated. To improve the validity of the ECCU method, the effect of the geometry parameter of a typical single-material calibration phantom (water calibration phantom) on the ECCU algorithm was investigated. Dual-material calibration phantoms (such as water-bone calibration phantom), geometry arrangement, and the area-ratio of dual-material calibration phantoms were also studied. Preliminary results implied that, to assure the effectiveness of the ECCU algorithm, the polychromatic projections of calibration phantoms must cover the polychromatic projection data of the scanning object. However, the projection range of a water calibration phantom is limited by the scan field of view (SFOV), thus leading to methodological limitations. A dual-material phantom of a proper size and material can overcome the limitations of a single-material phantom and achieve good correction effects.

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Section: Introductionmentioning

confidence: 99%

An Investigation of Calibration Phantoms for CT Scanners with Tube Voltage Modulation

Jing

2013

International Journal of Biomedical Imaging

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“…Most of the correction methods in this class are performed before the final CT image is reconstructed. Third, there is the so-called post-processing method class, which includes: bone-correction for the imaged objects of Tang et al: Data consistency condition-based beam-hardening correction two-material components 7,8 or multimaterial components, 18 iteration between the projection space and the image space with a prior knowledge of polychromatic x ray spectrum, [19][20][21] bi-polynomial linearization, 22 Helgasson-Ludwig (H-L) consistency condition based corrections, [23][24][25] empirical beamhardening correction (EBHC), 26 etc. The major characteristic of this class is that they are performed based on an initial reconstruction or image segmentation.…”

Section: Introductionmentioning

confidence: 99%

Data consistency condition–based beam-hardening correction

Mou

2011

Opt. Eng

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Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 05/15/2015 Terms of Use: http://spiedl.org/terms Optical Engineering 50(7), 076501 (July 2011) Abstract.In medical x ray computed tomography (CT) imaging devices, the x ray tube usually emits a polychromatic spectrum of photons resulting in beam-hardening artifacts in the reconstructed images. The bonecorrection method has been widely adopted to compensate for beamhardening artifacts. However, its correction performance is highly dependent on the empirical determination of a scaling factor, which is used to adjust the ratio of the reconstructed value in the bone region to the actual mass density of bone-tissue. A significant problem with bone-correction is that a large number of physical experiments are routinely required to accurately calibrate the scaling factor. In this article, an improved bonecorrection method is proposed, based on the projection data consistency condition, to automatically determine the scaling factor. Extensive numerical simulations have verified the existence of an optimal scaling factor, the sensitivity of bone-correction to the scaling factor, and the efficiency of the proposed method for the beam-hardening correction. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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“…The method is similar to their previously described method [5], which can correct artifacts induced only be bones. In 2000, Chye Hwang Yan, etc [11] presented an algorithm scheme simultaneously for both single-and dual-energy XCT. Also it needs polychromatic characteristics of the X-ray source, and alternate re-projection and back-projection during iteration procedure.…”

Section: Introductionmentioning

confidence: 99%

Comparison on beam hardening correction of CT based on H-L consistency and normal water phantom experiment

Mou

Tang

2006

SPIE Proceedings

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An H-L Consistency based beam hardening correction method of CT with polychromatic x-ray tube spectrum has been proposed recently. To identify its effectiveness, a comparison research is completed in the paper between this method and water phantom experiment correction used in current CT devices. For reason of isolating irrelevant influence, the simulated projection data of Forbild head phantom based on physics of medical x-ray imaging are used to evaluate correction effects. Firstly, a virtual circular fan beam CT with known parameters (tube spectrum, added filter, mechanical parameters, etc.) is constructed. Secondly, a simulated isotropic water phantom is used to generate normal correction polynomial in current CT device (called normal correction). Thirdly, for the projection data of given CT phantom, sole-polynomial and bi-polynomial correction based on H-L Consistency, and normal water phantom correction are applied respectively. Fourthly, all the corrected projection data are reconstructed with the same FBP algorithm. The correction effects of beam hardening artifact are compared between those three applied correction methods, especially the differences of correction effects in different slices. Simulation experiments show that the bi-polynomial method can achieve the best effect, although it costs more computation resource, and the H-L Consistency based method exhibit accordant correction effect for different slices, whereas the normal correction cannot adapt all slices equally.

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Reconstruction algorithm for polychromatic CT imaging: application to beam hardening correction

Cited by 106 publications

References 17 publications

An Investigation of Calibration Phantoms for CT Scanners with Tube Voltage Modulation

An Investigation of Calibration Phantoms for CT Scanners with Tube Voltage Modulation

Data consistency condition–based beam-hardening correction

Comparison on beam hardening correction of CT based on H-L consistency and normal water phantom experiment

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