X-ray Attenuation and Reduction of Backscattered Radiation

Naji, Abdullah T.; Jaafar, Mohamad Suhaimi; Ali, Esmail Abdo Mohammed; Al‐Ani, S. K. J.

doi:10.5539/apr.v8n4p92

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…This is because grid's material (iron and/or steel) which has better capability in attenuating of backscattered radiation. This result is in agreement with Naji et al (2016) who reported that the iron steel grid has best value in reducing backscattered radiation during X-ray examinations…”

Section: Image Contrast Variation At Various Massupporting

confidence: 83%

“…Different antibackscattered grids show the best values in enhancement of image contrast index at lower peak tube voltage (50 kVp) because more backscattered photons can be attenuated by anti-backscattered grid by grid's base and strips. This result is in agreement with Naji et al (2016) who report that the best reduction of backscattered radiation can be obtained with lower exposure's energy.…”

Section: Image Contrast At Various X-ray Energy (Kvp)supporting

confidence: 82%

“…Therefore, Scatter radiation can greatly reduce X-ray image contrast to the extent that subtle opacities may not be visualized (Yumpu, 2015;Guy & Flytche, 2005). Naji et al (2016) introduced a method to reduce backscattered radiation which can affect on image contrast by using iron steel grid with several metal plates Contrast enhancement is an image optimization technique that refers to increasing the intensity difference between the region of interest and background (Godwin et al, 2014). Image contrast enhancement is an important aspect in medical applications due to the fact that visual examination of medical images is essential in the diagnosis of many diseases (Mohanta & Khanaa, 2013).…”

Section: S ≅ S ≅ Smentioning

confidence: 99%

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Effect of Backscattered Radiation on X-Ray Image Contrast

Naji¹,

Jaafar²,

Ali³

et al. 2017

APR

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This paper assesses the effect of backscattered radiation on X-ray image contrast by evaluating the effect of backscatter reduction on X-ray image contrast. Contrast test tool RMI Densitometer, and different types of fabricated anti backscattered grids have been utilized in this study. The measurements are recorded at different exposure parameters such as X-ray tube peak voltage (kVp), and X-rays intensities (mAs). For each exposure, the contrast of the image is evaluated by measuring the variation in optical densities for aluminium steps wedge. The results showed that the x-ray image contrast can be enhanced by decreasing the amount of backscattered radiation, also the fabricated anti backscattered grids have a remarkable effect in the improvement of X-ray image contrast according to grid's capability in reducing backscattered radiation. In addition, the effectiveness of fabricated grids in improving image contrast depends on the grid's material and the geometrical design, as well as the radiation exposure parameters. The image contrast enhancements increased up to 36% with the use of crossed iron steel grid which placed under the film screen combination during exposure.

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Section: Image Contrast Variation At Various Massupporting

confidence: 83%

Section: Image Contrast At Various X-ray Energy (Kvp)supporting

confidence: 82%

Section: S ≅ S ≅ Smentioning

confidence: 99%

See 1 more Smart Citation

Effect of Backscattered Radiation on X-Ray Image Contrast

Naji¹,

Jaafar²,

Ali³

et al. 2017

APR

Self Cite

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“…In case of the used filters, it should be considered that different materials have different attenuation properties depending on their atomic number and mass density 22,23 .…”

Section: Discussionmentioning

confidence: 99%

“…In case of the used filters, it should be considered that different materials have different attenuation properties depending on their atomic number and mass density 22,23 . Hence, Al (Z = 13) and Cu (Z = 29) show different attenuation patterns for X-ray photons also in dependence of their thickness and combination with each other 24 .…”

Section: Discussionmentioning

confidence: 99%

Micro-CT analyses of the lung in mice: Parameters influencing the radiation dose and acquisition quality

Körner

Körbel

Dzierma

et al. 2022

Preprint

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Microcomputed tomography (micro-CT) is a frequently used imaging tool for a wide spectrum of in-vivo mouse models in basic and translational research. To allow an accurate interpretation of micro-CT images, high spatial resolution is necessary. However, this may also lead to a high radiation exposure of the animals. Therefore, animal welfare requires exact information about the expected radiation doses for experimental planning. To gain this, a mouse cadaver was herein used for micro-CT analyses under different conditions. For each radiation dose measurement, the cadaver was labeled with thermoluminescent dosimeter chips around the thoracic skin surface. Micro-CT scans of the thorax were performed with spatial resolutions of 35 µm, 18 µm and 9 µm in combination with Al0.5, Al1.0, CuAl and Cu filters. As a surrogate of image quality, the number of identifiable lung vessels was counted on a transversal micro-CT slice. Measured radiation doses varied from 0.09 Gy up to 5.18 Gy dependent on resolution and filter settings. A significant dose reduction of > 75% was achieved by a Cu filter when compared to an Al0.5 filter. However, this resulted in a markedly reduced image quality and interpretability of microstructures due to higher radiation shielding and lower spatial resolution. Thus, the right combination of distinct filters and several scan protocol settings adjusted to the individual requirements can significantly reduce the radiation dose of micro-CT leading to a higher animal welfare standard.

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