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Effectiveness of antiscatter grids in digital radiography. A phantom study
Investigative Radiology
|June 1, 1994
Summary
For bedside digital chest radiography, using an antiscatter grid offers minimal improvement. Both flexible circular hole (FCH) and conventional grids showed limited benefits in enhancing image quality at fixed exposure levels.
Area of Science:
- Radiological imaging
- Medical physics
- Diagnostic radiology
Background:
- Bedside radiography increasingly uses digital imaging techniques.
- The necessity and type of antiscatter grids for reducing scattered radiation effects are frequently questioned.
Purpose of the Study:
- To quantitatively analyze and compare image quality metrics.
- Evaluate the performance of a flexible circular hole (FCH) grid versus a conventional 6:1 focused grid, and no grid, in digital chest radiography.
Main Methods:
- Measurement of scatter-to-primary ratios (SPRs), contrast signals, and contrast-to-noise ratios (CNRs).
- Image acquisition performed on an anthropomorphic chest phantom at fixed patient exposure.
- Comparison across various image locations.
Main Results:
- Both grids increased contrast signals.
- A significant improvement in CNR was observed only in the upper and middle mediastinum with the conventional grid.
- The FCH grid degraded CNR at most chest image locations.
Conclusions:
- At a fixed exposure level, antiscatter grids provide only marginal benefits in bedside digital chest radiography.
- Conventional grids may offer localized CNR improvements, while FCH grids can degrade image quality.