Minimizing the scatter contribution and spatial spread due to the absorption grating G2 in grating-based phase-contrast imaging

Research output: Contribution to report/book/conference proceedingsIn-proceedings paperpeer-review

Standard

Minimizing the scatter contribution and spatial spread due to the absorption grating G2 in grating-based phase-contrast imaging. / Vignero, Janne; Rodriguez Pérez, Sunay; W. Marshall, Nicholas; Bosmans, Hilde.

Medical Imaging 2018: Physics of Medical Imaging. Vol. 2018 105734H. ed. SPIE - Society of Photo-optical Instrumentation Engineers, 2018. p. 8.

Research output: Contribution to report/book/conference proceedingsIn-proceedings paperpeer-review

Harvard

Vignero, J, Rodriguez Pérez, S, W. Marshall, N & Bosmans, H 2018, Minimizing the scatter contribution and spatial spread due to the absorption grating G2 in grating-based phase-contrast imaging. in Medical Imaging 2018: Physics of Medical Imaging. 105734H edn, vol. 2018, SPIE - Society of Photo-optical Instrumentation Engineers, pp. 8, 2018 - SPIE - Medical Imaging, Houston, Texas, United States, 2018-02-10. https://doi.org/10.1117/12.2293994

APA

Vignero, J., Rodriguez Pérez, S., W. Marshall, N., & Bosmans, H. (2018). Minimizing the scatter contribution and spatial spread due to the absorption grating G2 in grating-based phase-contrast imaging. In Medical Imaging 2018: Physics of Medical Imaging (105734H ed., Vol. 2018, pp. 8). SPIE - Society of Photo-optical Instrumentation Engineers. https://doi.org/10.1117/12.2293994

Vancouver

Vignero J, Rodriguez Pérez S, W. Marshall N, Bosmans H. Minimizing the scatter contribution and spatial spread due to the absorption grating G2 in grating-based phase-contrast imaging. In Medical Imaging 2018: Physics of Medical Imaging. 105734H ed. Vol. 2018. SPIE - Society of Photo-optical Instrumentation Engineers. 2018. p. 8 https://doi.org/10.1117/12.2293994

Author

Vignero, Janne ; Rodriguez Pérez, Sunay ; W. Marshall, Nicholas ; Bosmans, Hilde. / Minimizing the scatter contribution and spatial spread due to the absorption grating G2 in grating-based phase-contrast imaging. Medical Imaging 2018: Physics of Medical Imaging. Vol. 2018 105734H. ed. SPIE - Society of Photo-optical Instrumentation Engineers, 2018. pp. 8

Bibtex - Download

@inproceedings{d6e6c0765a254587b44d87766024e799,
title = "Minimizing the scatter contribution and spatial spread due to the absorption grating G2 in grating-based phase-contrast imaging",
abstract = "In previous research1 it was shown that in grating-based phase-contrast imaging (GB-PCI) for low scatter objects, G2 is the dominant scattering source. This scatter is manifested in a different way compared to object scatter, as scattered photons that remain local to the interaction site may even increase object contrast, but reduce system visibility. In this work the magnitude and the spatial distribution of scattered photons from G2 are studied for different conditions using Monte Carlo simulations: (1) The effect of G2 orientation on the scatter-to-primary ratios (SPRs), (2) the impact of reducing the G2-to-detector distance (D) from 1.21 cm (current setting) to 0.5 cm on the spatial scatter distribution, and (3) the possibility to apply the G2 scatter probability to predict the scatter images from any primary object image. It was shown that flipping the G2 grating with its substrate away from the detector reduces the scatter-to-primary ratio by a factor 1.15. Furthermore, when D is 1.21 cm, 50% of the scattered photons fell within the first 18 pixels, while for D equal to 0.5 cm, 50% fell within the first 9 pixels, with however a slightly increased SPR. It was shown that convolution of these spatial distributions with the primary images of low scattering objects allows prediction of scatter images with a mean percentage deviation of 21% and 16% for D is 0.5 and 1.21 cm respectively. This work therefore illustrates that small optimization steps can have a notable impact on the magnitude and spatial distribution of scattered radiation at the level of the detector in GB-PCI. An approach to estimate scattered radiation images for objects that produce low levels of scattered radiation was presented.",
keywords = "Monte Carlo methods, Scattering, X-rays, Absorption, Photons, Convolution, Rayleigh scattering",
author = "Janne Vignero and {Rodriguez P{\'e}rez}, Sunay and {W. Marshall}, Nicholas and Hilde Bosmans",
note = "Score=3; 2018 - SPIE - Medical Imaging : The international society for optics and photonics ; Conference date: 10-02-2018 Through 15-02-2018",
year = "2018",
month = mar,
day = "8",
doi = "10.1117/12.2293994",
language = "English",
volume = "2018",
pages = "8",
booktitle = "Medical Imaging 2018: Physics of Medical Imaging",
publisher = "SPIE - Society of Photo-optical Instrumentation Engineers",
edition = "105734H",
url = "http://spie.org/conferences-and-exhibitions/past-conferences-and-exhibitions/medical-imaging-2018/",

}

RIS - Download

TY - GEN

T1 - Minimizing the scatter contribution and spatial spread due to the absorption grating G2 in grating-based phase-contrast imaging

AU - Vignero, Janne

AU - Rodriguez Pérez, Sunay

AU - W. Marshall, Nicholas

AU - Bosmans, Hilde

N1 - Score=3

PY - 2018/3/8

Y1 - 2018/3/8

N2 - In previous research1 it was shown that in grating-based phase-contrast imaging (GB-PCI) for low scatter objects, G2 is the dominant scattering source. This scatter is manifested in a different way compared to object scatter, as scattered photons that remain local to the interaction site may even increase object contrast, but reduce system visibility. In this work the magnitude and the spatial distribution of scattered photons from G2 are studied for different conditions using Monte Carlo simulations: (1) The effect of G2 orientation on the scatter-to-primary ratios (SPRs), (2) the impact of reducing the G2-to-detector distance (D) from 1.21 cm (current setting) to 0.5 cm on the spatial scatter distribution, and (3) the possibility to apply the G2 scatter probability to predict the scatter images from any primary object image. It was shown that flipping the G2 grating with its substrate away from the detector reduces the scatter-to-primary ratio by a factor 1.15. Furthermore, when D is 1.21 cm, 50% of the scattered photons fell within the first 18 pixels, while for D equal to 0.5 cm, 50% fell within the first 9 pixels, with however a slightly increased SPR. It was shown that convolution of these spatial distributions with the primary images of low scattering objects allows prediction of scatter images with a mean percentage deviation of 21% and 16% for D is 0.5 and 1.21 cm respectively. This work therefore illustrates that small optimization steps can have a notable impact on the magnitude and spatial distribution of scattered radiation at the level of the detector in GB-PCI. An approach to estimate scattered radiation images for objects that produce low levels of scattered radiation was presented.

AB - In previous research1 it was shown that in grating-based phase-contrast imaging (GB-PCI) for low scatter objects, G2 is the dominant scattering source. This scatter is manifested in a different way compared to object scatter, as scattered photons that remain local to the interaction site may even increase object contrast, but reduce system visibility. In this work the magnitude and the spatial distribution of scattered photons from G2 are studied for different conditions using Monte Carlo simulations: (1) The effect of G2 orientation on the scatter-to-primary ratios (SPRs), (2) the impact of reducing the G2-to-detector distance (D) from 1.21 cm (current setting) to 0.5 cm on the spatial scatter distribution, and (3) the possibility to apply the G2 scatter probability to predict the scatter images from any primary object image. It was shown that flipping the G2 grating with its substrate away from the detector reduces the scatter-to-primary ratio by a factor 1.15. Furthermore, when D is 1.21 cm, 50% of the scattered photons fell within the first 18 pixels, while for D equal to 0.5 cm, 50% fell within the first 9 pixels, with however a slightly increased SPR. It was shown that convolution of these spatial distributions with the primary images of low scattering objects allows prediction of scatter images with a mean percentage deviation of 21% and 16% for D is 0.5 and 1.21 cm respectively. This work therefore illustrates that small optimization steps can have a notable impact on the magnitude and spatial distribution of scattered radiation at the level of the detector in GB-PCI. An approach to estimate scattered radiation images for objects that produce low levels of scattered radiation was presented.

KW - Monte Carlo methods

KW - Scattering

KW - X-rays

KW - Absorption

KW - Photons

KW - Convolution

KW - Rayleigh scattering

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/29964082

U2 - 10.1117/12.2293994

DO - 10.1117/12.2293994

M3 - In-proceedings paper

VL - 2018

SP - 8

BT - Medical Imaging 2018: Physics of Medical Imaging

PB - SPIE - Society of Photo-optical Instrumentation Engineers

T2 - 2018 - SPIE - Medical Imaging

Y2 - 10 February 2018 through 15 February 2018

ER -

ID: 3943164