Local-filtration Based Scatter Correction for Conebeam CT Using Planning CT as a Prior

Cui, Hehe; Xu, Guoying; Zhu, Lei

doi:10.1109/icmipe47306.2019.9098205

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…One way to model the CBCT scatter is to borrow the prior information from a patient's previous CT. This type of method performs well only when a decent registration between the current CBCT and the prior CT can be established , Shi et al 2017, Cui et al 2019, Cui et al 2021. Recent researches have shown the great potential of deep learning scatter correction methods, but their performance is heavily relied on the quality and quantity of the training data (Hansen et al 2018, Kida et al 2018, Maier et al 2018, Jiang et al 2019, Roser et al 2021, Maul et al 2022.…”

Section: Introductionmentioning

confidence: 99%

A practical and robust method for beam blocker-based cone beam CT scatter correction

et al. 2023

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Objective. In the traditional beam-blocker based cone beam CT (CBCT) scatter correction, the scatter measured in the region shaded by lead strips was multiplied by a correction factor to directly represent the scatter in the unblocked region. The correction factor optimization is a tedious process and lacks objective stop criterion. To skip the optimization process, an indirect scatter estimation method was developed and validated in phantom imaging. Approach. A beam-blocker made of lead strips was mounted between the X-ray source and object for scatter estimation. The primary signal between lead strips in the blocked region was first calculated by subtracting the measured scatter, and then used to calculate the scatter signal in the unblocked region corresponding to the same attenuation path. The calculated scatter signal was smoothed via local filtration and used to correct the measured projection in the unblocked region. Finally, the CBCT was reconstructed via Feldkamp-Davis-Kress (FDK) algorithm. A Catphan and a head phantom were used to verify the performance of the proposed method in both full- and half-blocker scenarios, and with and without a bow-tie filter. Main Results. For scans without the bow-tie filter, the CT number error was reduced to 3.97±2.27 and 5.51±3.90 HU in the full- and half-blocker scenarios, respectively, for the Catphan, and to 4.01±2.18 and 7.97±4.05 HU for the head phantom. When the bow-tie filter was applied, the CT number error was reduced to 2.29±1.42 and 6.72±0.77 HU in the full- and half-blocker scenarios, respectively, for the Catphan, and 2.35±1.25 and 4.96±1.89 HU for the head phantom. Significance: The proposed method effectively avoids the influence of the inserted beam blocker itself on the scatter intensity estimation, and proves a more practical and robust way for the beam-blocker based scatter correction in CBCT scanning.

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Section: Introductionmentioning

confidence: 99%

A practical and robust method for beam blocker-based cone beam CT scatter correction

et al. 2023

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“…Other heuristic methods compensate for scatter by exploiting prior knowledge on the particular application of the CT device, such as the cylindrical symmetry of the object [11], or by considering the scattered radiation as a blurred projection [12]. The main aim of these methods is the removal of the cupping artifacts generated by the scattered radiation.…”

Section: Introductionmentioning

confidence: 99%

CAD-Based Scatter Compensation For Polychromatic Reconstruction Of Additive Manufactured Parts

Iuso¹,

Nazemi

Six

et al. 2021

2021 IEEE International Conference on Image Processing (ICIP)

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High density materials, such as metals, strongly scatter Xray photons during X-ray Computed Tomography (CT) scans, which is detrimental to the quality of the reconstructed images. In this study, a scatter compensation method for X-ray CT, based on Monte-Carlo (MC) simulations from the object's CAD model, is presented and employed in conjunction with polychromatic reconstructions. The estimation of the scatter contributions is accelerated by 1) reducing the number of simulated projections accordingly to the Nyquist theorem, 2) noise reduction 3) angular interpolation. The method was applied to enhance CT images of a steel object produced via Additive Manufacturing, whose CAD model is known. Results show that, in conjunction with polychromatic reconstruction, our method can efficiently reduce beam hardening, scattering artifacts and increase the contrast of defects within the object.

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Local-filtration Based Scatter Correction for Conebeam CT Using Planning CT as a Prior

Cited by 2 publications

References 36 publications

A practical and robust method for beam blocker-based cone beam CT scatter correction

A practical and robust method for beam blocker-based cone beam CT scatter correction

CAD-Based Scatter Compensation For Polychromatic Reconstruction Of Additive Manufactured Parts

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