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Enhancing image quality
- The antiscatter grid plays an important role for enhancing image quality in projection radiography by transmitting a majority of primary radiation and selectively rejecting scattered radiation.
www.upstate.edu/radiology/education/rsna/radiography/scattergrid.php
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Why are antiscatter grids used in digital mammography?
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Why do X rays have anti-scatter grids?
Antiscatter grids improve the X-ray image contrast at a cost of patient radiation doses. The choice of appropriate grid or its removal requires a good knowledge of grid characteristics, especially for pediatric digital imaging.
Feb 17, 2015 · Antiscatter grids are used in digital mammography to reduce the scattered radiation from the breast and improve image contrast. They are, however, imperfect and lead to partial absorption of primary radiation, as well as failing to absorb all scattered radiation.
- Han Chen, Mats E. Danielsson, Cheng Xu, Björn Cederström
- 10.1117/1.JMI.2.1.013501
- 2015
- 2015/01
- Comparing Conventional Indices with Prior Research Studies
- Evaluating The Performance of A New Index in Dr System
- Study Limitations
- Future Prospects
The grid performance is dependent on the grid ratio, strip frequency, focusing distance, and interspace material. The focusing distance from the grid should be selected according to the exposure distance for each body part. When the exposure distance and the focusing distance to the grid are same, variations in the grid ratio, strip frequency, and ...
Chan et al. developed a theoretical model in terms of the signal-to-noise ratio (SNR) for DR systems using grids . Their proposed SNR improvement factor (SIF) is represented by the ratio of Tp to the square root of Tt \(\left({\text{SIF}}={T}_{p}/ {\sqrt{{T}_{t}}}\right)\), and this method is widely used for the evaluation of grid performance [6,7,...
This study was conducted under some restrictions. According to the IEC standard 60627: 2013 , the dosimeter is defined as a radiation detector that incorporates a fluorescent screen and a photodetector, and the diameter of the diaphragm for primary radiation measurement is 6 mm on the detector plane. However, in this study, a semiconductor detector...
We evaluated the performance of the grids in terms of the exposure dose for different phantom thicknesses and irradiation fields. Furthermore, it is also necessary to evaluate different detector performances of DR systems, such as computed radiography (CR) and flat-panel detector systems, as detectors with different spatial frequency characteristic...
Feb 7, 2021 · We have been investigating two-dimensional (2D) antiscatter grids (2D ASGs) to reduce scatter fluence and improve image quality in cone beam computed tomography (CBCT). In this work, two different aspects of 2D ASGs, their scatter rejection and correction capability, were investigated in CBCT experiments.
- Yeonok Park, Timur Alexeev, Brian Miller, Moyed Miften, Cem Altunbas
- 11
- 2021
- 07 February 2021
Jan 1, 2023 · In an X-ray imaging system, scattered radiation increases noise and decreases the signal-to-noise ratio (SNR). Employing an anti-scatter grid affects the primary-to-scatter ratio. Whilst reducing scatter-related noise, anti-scatter grids also decrease the intensity of the primary signal intensity.
The antiscatter grid plays an important role for enhancing image quality in projection radiography by transmitting a majority of primary radiation and selectively rejecting scattered radiation.
Feb 23, 2009 · The purpose of this study is to evaluate the performance of an antiscatter grid and its potential benefit on image quality for a full-field digital mammography (FFDM) detector geometry at energies typical for temporal subtraction contrast-enhanced (CE) breast imaging.
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