An X-ray spectrum estimation method from transmission measurement combined with scatter correction

Kim, Guna; Cho, Hyosung; Lim, Ilhan; Song, Kye‐Yong; Kim, Jong-Guk

doi:10.1016/j.ejmp.2021.03.033

Cited by 4 publications

(4 citation statements)

References 26 publications

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“…We compared our scatter correction method with the following: (1) the post-processing method proposed by Meng et al 31 , which was based on image dehazing and later used by Kim et al 27 – 29 in radiography; (2) the method based on a beam stopper proposed by Cai et al 38 ; and (3) the deep learning method proposed by Maier et al 34 , deep scatter estimation (DSE). Below, we provide a summary of the simulation setting and the parameters used in the implementation of these methods.…”

Section: Methodsmentioning

confidence: 99%

“…The main advantage of the method is that the correction is based directly on measurements of the scatter component over the entire field-of-view of the patient, making it a suitable option for nonstandard positions in portable radiography. We compare our method with three representative methods in the literature: (1) the beam stopper-based scatter correction method presented by Cai et al 38 , which shares hardware requirements with our proposal (evaluating only the part of their algorithm devoted to correct projections); (2) the software-based post-processing method proposed by Meng et al 31 and that has also been reported to provide a good scatter estimate in planar radiography 27 – 29 ; and (3) the deep learning scatter correction method proposed by Maier et al 34 . Comparison with other beam stopper methods can be found in the “Supplementary material”.…”

Section: Introductionmentioning

confidence: 99%

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A novel beam stopper-based approach for scatter correction in digital planar radiography

Sakaltras

Pena

Martinez

et al. 2023

Sci Rep

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X-ray scatter in planar radiography degrades the contrast resolution of the image, thus reducing its diagnostic utility. Antiscatter grids partially block scattered photons at the cost of increasing the dose delivered by two- to four-fold and posing geometrical restrictions that hinder their use for other acquisition settings, such as portable radiography. The few software-based approaches investigated for planar radiography mainly estimate the scatter map from a low-frequency version of the image. We present a novel method for scatter correction in planar imaging based on direct patient measurements. Samples from the shadowed regions of an additional partially obstructed projection acquired with a beam stopper placed between the X-ray source and the patient are used to estimate the scatter map. Evaluation with simulated and real data showed an increase in contrast resolution for both lung and spine and recovery of ground truth values superior to those of three recently proposed methods. Our method avoids the biases of post-processing methods and yields results similar to those for an antiscatter grid while removing geometrical restrictions at around half the radiation dose. It can be used in unconventional imaging techniques, such as portable radiography, where training datasets needed for deep-learning approaches would be very difficult to obtain.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel beam stopper-based approach for scatter correction in digital planar radiography

Sakaltras

Pena

Martinez

et al. 2023

Sci Rep

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show abstract

“…1 Knowing the energy spectrum of ionizing radiation inside an x-ray room is essential to optimize the design of radiation protection measures. [2][3][4][5][6][7][8][9][10] These measures must be taken for the protection of the patient 11,12 and the professionals inside the room [13][14][15][16][17][18][19][20][21][22] and the professionals and the public outside it. 23 In this work, Monte Carlo simulations are carried out to characterize the scattered radiation inside the x-ray room.…”

Section: Introductionmentioning

confidence: 99%

“…Knowing the energy spectrum of ionizing radiation inside an x‐ray room is essential to optimize the design of radiation protection measures 2–10 . These measures must be taken for the protection of the patient 11,12 and the professionals inside the room 13–22 and the professionals and the public outside it 23 …”

Section: Introductionmentioning

confidence: 99%

Technical note: Characteristics of the energy spread kernels of scattered radiation in an x‐ray room

González‐López

2022

Medical Physics

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To describe the scattered radiation spectra inside an x-ray room for different scattering conditions. Methods: Monte Carlo simulations of an x-ray room using phantoms of different size, varying field sizes, and a range of mono-energetic beams were carried out. For each energy, the particle fluence spectrum of scattered photons was collected at different spherical zones to describe the radiation reaching the different boundaries of the x-ray room. The effect on the scattered spectrum of the room floor was also considered. Results:The scattered spectra for mono-energetic primary beams at a given spherical zone give rise to oriented energy spread kernels (OESKs) that can be used to calculate the scattered spectrum for any poly-energetic beam at that zone. Despite the large differences, which can be seen in the OESKs when the scattering conditions vary, an important invariance is also observed: the position of the broad scatter peak for a given primary energy and zone. Conclusions: The result of breaking down the calculation of the scattered radiation spectrum into the different factors that influence it allows estimating the spectrum in a wide range of situations. The invariant position of the broad scatter peak can be used to estimate the highest energy of the scattered photons for a given primary energy and zone, which may determine radiation shielding needs.

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Advanced mathematical modeling for preciseestimation of CT energy spectrum using a calibration phantom

Heon Kim,

Hyun Ahn,

Woo Park

et al. 2024

Physica Medica

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An X-ray spectrum estimation method from transmission measurement combined with scatter correction

Cited by 4 publications

References 26 publications

A novel beam stopper-based approach for scatter correction in digital planar radiography

A novel beam stopper-based approach for scatter correction in digital planar radiography

Technical note: Characteristics of the energy spread kernels of scattered radiation in an x‐ray room

Advanced mathematical modeling for preciseestimation of CT energy spectrum using a calibration phantom

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