Iterative Scatter Correction for Grid-Less Bedside Chest Radiography: Performance for a Chest Phantom

Mentrup, Detlef; Jockel, Sascha; Menser, Bernd; Neitzel, Ulrich

doi:10.1093/rpd/ncv432

Cited by 37 publications

(54 citation statements)

References 9 publications

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“…Eventual damage requires grid installation and replacement, and related costs. To overcome these limitations, researchers developed software that provides scatter correction without the physical use of a grid ( 4 5 6 7 ). The technology enables estimation of the scatter signal and calculation of the grid effect.…”

Section: Introductionmentioning

confidence: 99%

“…Subsequently, the de-scattered raw image is processed by the post-processing software of the digital radiography system. Although the value of scatter correction in terms of physical properties using a phantom has been reported ( 6 7 ), no test of observer preference has been performed to facilitate clinical application of this software.…”

Section: Introductionmentioning

confidence: 99%

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The Potential Role of Grid-Like Software in Bedside Chest Radiography in Improving Image Quality and Dose Reduction: An Observer Preference Study

2018

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ObjectiveTo compare the observer preference of image quality and radiation dose between non-grid, grid-like, and grid images.Materials and MethodsEach of the 38 patients underwent bedside chest radiography with and without a grid. A grid-like image was generated from a non-grid image using SimGrid software (Samsung Electronics Co. Ltd.) employing deep-learning-based scatter correction technology. Two readers recorded the preference for 10 anatomic landmarks and the overall appearance on a five-point scale for a pair of non-grid and grid-like images, and a pair of grid-like and grid images, respectively, which were randomly presented. The dose area product (DAP) was also recorded. Wilcoxon's rank sum test was used to assess the significance of preference.ResultsBoth readers preferred grid-like images to non-grid images significantly (p < 0.001); with a significant difference in terms of the preference for grid images to grid-like images (p = 0.317, 0.034, respectively). In terms of anatomic landmarks, both readers preferred grid-like images to non-grid images (p < 0.05). No significant differences existed between grid-like and grid images except for the preference for grid images in proximal airways by two readers, and in retrocardiac lung and thoracic spine by one reader. The median DAP were 1.48 (range, 1.37–2.17) dGy*cm2 in grid images and 1.22 (range, 1.11–1.78) dGy*cm2 in grid-like images with a significant difference (p < 0.001).ConclusionThe SimGrid software significantly improved the image quality of non-grid images to a level comparable to that of grid images with a relatively lower level of radiation exposure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Potential Role of Grid-Like Software in Bedside Chest Radiography in Improving Image Quality and Dose Reduction: An Observer Preference Study

2018

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“…Scattered radiation degrades the image quality of these areas of obscured lung and, therefore, contrast in these areas may be restored by using a grid. A phantom study revealed similar results with software-based scatter correction by demonstrating greater contrast improvement in the heart and abdominal areas than the lung area ( 9 ). In comparison, the areas of the thoracic spine and azygoesophageal recess, of which considerable scattered radiation occurs, received the highest preference for the algorithm-applied image.…”

Section: Discussionmentioning

confidence: 75%

“…Recently, a virtual grid technique using scatter correction software has been developed to improve image quality by reducing the effect of scattered X-rays ( 9 10 ). In this approach, an iterative estimation of the scatter signal through Monte Carlo simulations of water phantoms is conducted, and scatter correction is conducted by compensating the contrast loss due to scattered signals.…”

Section: Discussionmentioning

confidence: 99%

Application of Deconvolution Algorithm of Point Spread Function in Improving Image Quality: An Observer Preference Study on Chest Radiography

et al. 2018

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ObjectiveTo evaluate the preference of observers for image quality of chest radiography using the deconvolution algorithm of point spread function (PSF) (TRUVIEW ART algorithm, DRTECH Corp.) compared with that of original chest radiography for visualization of anatomic regions of the chest.Materials and MethodsProspectively enrolled 50 pairs of posteroanterior chest radiographs collected with standard protocol and with additional TRUVIEW ART algorithm were compared by four chest radiologists. This algorithm corrects scattered signals generated by a scintillator. Readers independently evaluated the visibility of 10 anatomical regions and overall image quality with a 5-point scale of preference. The significance of the differences in reader's preference was tested with a Wilcoxon's signed rank test.ResultsAll four readers preferred the images applied with the algorithm to those without algorithm for all 10 anatomical regions (mean, 3.6; range, 3.2–4.0; p < 0.001) and for the overall image quality (mean, 3.8; range, 3.3–4.0; p < 0.001). The most preferred anatomical regions were the azygoesophageal recess, thoracic spine, and unobscured lung.ConclusionThe visibility of chest anatomical structures applied with the deconvolution algorithm of PSF was superior to the original chest radiography.

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“…46 Fast Monte-Carlo methods maybe used to expedite the algorithm, as is done for mammography or BCT. 45,46,48 We are in communication with Microworks GmbH, Germany, 49 to build preliminary MPG gratings suitable for breast imaging. In the future, we anticipate building a prototype by modifying existing TLXI systems in Pennington Biomedical Research Center, LSU, and at the synchrotron source at Louisiana State University Center for Advanced Microstructures and Devices.…”

Section: Discussion and Future Workmentioning

confidence: 99%

X-ray interferometry without analyzer for breast CT application: a simulation study

Ham

Dey

2020

J. Med. Imag.

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Purpose: We investigate an analyzer-less x-ray interferometer with a spatially modulated phase grating (MPG) that can deliver three modalities (attenuation image, phase image, and scatter images) in breast computed tomography (BCT). The system can provide three x-ray modalities while preserving the dose to the object and can achieve attenuation image sensitivity similar to that of a standard absorption-only BCT. The MPG system works with a source, a source-grating, a single phase grating, and a detector. No analyzer is necessary. Thus, there is an approximately 2x improvement in fluence at the detector for our system compared with the same sourcedetector distance Talbot-Lau x-ray interferometry (TLXI) because the TLXI has an analyzer after the object, which is not required for the MPG. Approach: We investigate the MPG BCT system in simulations and find a clinically feasible system geometry. First, the mechanism of MPG interferometry is conceptually shown via Sommerfeld-Rayleigh diffraction integral simulations. Next, we investigate source coherence requirements, fringe visibility, and phase sensitivity dependence on different system parameters and find clinically feasible system geometry. Results: The phase sensitivity of MPG interferometry is proportional to object-detector distance and inversely proportional to a period of broad fringes at the detector, which is determined by the grating spatial modulation period. In our simulations, the MPG interferometry can achieve about 27% fringe visibility with clinically realistic BCT geometry of a total source-detector distance of 950 mm and source-object distance of 500 mm. Conclusions: We simulated a promising analyzer-less x-ray interferometer, with a spatially sinusoidal MPG. Our system is expected to deliver the attenuation, phase and scatter image in a single acquisition without dose or fluence detriment, compared with conventional BCT.

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Iterative Scatter Correction for Grid-Less Bedside Chest Radiography: Performance for a Chest Phantom

Cited by 37 publications

References 9 publications

The Potential Role of Grid-Like Software in Bedside Chest Radiography in Improving Image Quality and Dose Reduction: An Observer Preference Study

The Potential Role of Grid-Like Software in Bedside Chest Radiography in Improving Image Quality and Dose Reduction: An Observer Preference Study

Application of Deconvolution Algorithm of Point Spread Function in Improving Image Quality: An Observer Preference Study on Chest Radiography

X-ray interferometry without analyzer for breast CT application: a simulation study

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