Comparison of anti-scatter grids for digital imaging with use of a direct-conversion flat-panel detector

Mizuta, Masayoshi; Sanada, Shigeru; Akazawa, Hiroyuki; Kasai, Toshifumi; Abe, Shuji; Ikeno, Yasuhiro; Mitou, Shigeki

doi:10.1007/s12194-011-0134-1

Cited by 24 publications

(16 citation statements)

References 14 publications

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“…It was found that if the scattered flux is cut to 10% of its actual value, the accuracy of the estimated plutonium thickness reaches the level of the result when no scattered flux is allowed on the detector (see supplementary material 29 ). This degree of reduction can be achieved with current-generation anti-scatter grids, 28 and the results suggest that these grids would need to be used when obtaining real radiographic data.…”

Section: Methodsmentioning

confidence: 99%

Non-invasive material discrimination using spectral x-ray radiography

Gilbert

McDonald

Robinson

et al. 2014

Journal of Applied Physics

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Current radiographic methods are limited in their ability to determine the presence of nuclear materials in containers or composite objects. A central problem is the inability to distinguish the attenuation pattern of high-density metals from those with a greater thickness of a less dense material. Here, we show that spectrally sensitive detectors can be used to discriminate plutonium from multiple layers of other materials using a single-view radiograph. An inverse algorithm with adaptive regularization is used. The algorithm can determine the presence of plutonium in simulated radiographs with a mass resolution per unit area of at least 0.07 g cm−2.

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Section: Methodsmentioning

confidence: 99%

Non-invasive material discrimination using spectral x-ray radiography

Gilbert

McDonald

Robinson

et al. 2014

Journal of Applied Physics

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“…First, the bucky factor B, which is one of the physical characteristic values of grids, is expressed by the following equation using the total x-ray transmittance of a grid T t [21][22][23][24]:…”

Section: Derivation Of Mif G (U)mentioning

confidence: 99%

“…Various reports have been made concerning the evaluation of the grids [18][19][20][21][22][23][24]. However, in recent years, a new index called the SNR improvement factor (SIF), to which the concept of the SNR has been applied, was introduced.…”

Section: Introductionmentioning

confidence: 99%

“…However, in recent years, a new index called the SNR improvement factor (SIF), to which the concept of the SNR has been applied, was introduced. This index is considered to be useful for expressing the characteristics of changes in image quality when using grids in a digital system, and it has been used for grid performance evaluation and the optimization of imaging conditions [21][22][23][24]. Starting approximately a decade ago, system performance evaluations and imaging conditions have been optimized using a comprehensive image quality indicator that incorporate various image quality factors that are frequency-dependent [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of anti-scatter grids via a modulation transfer function improvement factor using an edge device

Maruyama

Saito

Sho

2021

Biomed. Phys. Eng. Express

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In optimizing the imaging conditions, changes in image quality due to scattered radiation are important evaluation targets. This study focuses on the evaluation of the image quality improvement characteristics obtained using anti-scatter grids in digital x-ray imaging, and proposes a frequency-dependent modulation transfer function (MTF) improvement factor, M I F G ( u ) , as a new evaluation index. Accordingly, the purpose of this study is to clarify the validity and the usefulness of this proposed index in the performance evaluation of grids. The proposed M I F G ( u ) method is applied to evaluate several types of grids with different grid densities and ratios, and the characteristics of grids exhibiting different performances are examined. The proposed index is calculated based on the MTF measurement by using an edge test device. The results show that M I F G ( u ) changed according to grid type and scatter conditions. In particular, a remarkable difference was observed in the high scatter condition compared with the low condition. M I F G ( u ) in the vertical direction with regards to the absorbing strips shows a peak at 0.2–0.5 cycles/mm and be a constant value from approximately 1 cycle/mm; while M I F G ( u ) in the parallel direction is a constant value with respect to changes in spatial frequency. It is shown that M I F G ( u ) could be used to accurately describe the characteristics of a grid under different imaging conditions. We believe that the use of the proposed index could expand the options for optimizing imaging conditions when using grids.

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“…The use of an anti-scatter grid is an effective way to significantly reduce the amount of scattered radiation reaching the x-ray detector and thereby improve the image quality for diagnostic x-ray imaging (Sandborg et al, 1993;Fetterly and Schueler, 2009;Mizuta et al, 2012). However, for megavoltage (MV) x-ray imaging in radiotherapy (Herman et al 2001), the use of a MV anti-scatter grid is not practical since a MV grid would be very bulky, heavy, and costly (Watson et al, 2005;Maltz et al, 2008).…”

Section: Introductionmentioning

confidence: 99%