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The numerical image quality metrics such as contrast, signal-to-noise ratio (SNR), high-contrast spatial resolution (HCSR), and SIF IQ were determined. These results were evaluated to determine the relation between grid parameters and image quality metrics.
There is considerable variability in image receptor response owing to varying scatter sensitivity, the use of grids with different grid ratios, collimation, beam filtration, the choice of kilovoltage, source-to-image distance, and image receptor size.
Apr 15, 2019 · Scattered X-rays are increased as the thickness of the PMMA phantom increases, negatively affecting DQE. The use of a grid improves the high-SNR image generation efficiency of the DR system, and this improvement was greater when a high-ratio grid was used.
- Sanghyun Lee, Woohyun Chung
- 2019
Assess which grid ratio is the most efficient at absorbing scattered radiation. Define the term grid frequency. Describe how to avoid the five methods of producing grid cut-off. Describe the grid focusing distance and focal range. Differentiate between a grid and a Bucky.
A grid is one of the key components of a digital radiography (DR) system because it removes scattered radiation, which arises when X-rays penetrate an object and improves diagnostic accuracy by enhancing image quality.
- Sanghyun Lee, Woohyun Chung
- 2019
Feb 17, 2015 · Therefore, image quality is instead quantified by signal-difference-to-noise ratio (SDNR), a.k.a. contrast-to-noise ratio (CNR). Removing the grid allows more primary radiation to reach the detector, which might compensate for the additional quantum noise caused by scattered radiation.
Apr 15, 2019 · In this study, we aimed to analyse the quality of X-ray images acquired using grids with different specifications and proposed standardised criteria for grid use on the basis of our results.
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