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Technical note: a comparison of antiscatter grids for digital radiography
1DR System Development Division, Canon Inc., Utsunomiya 321-3292, Japan.
The British Journal of Radiology
|October 28, 2004
Summary
For fixed digital radiography (DR) systems, selecting a 12:1 antiscatter grid with low atomic number materials offers the highest signal-to-noise improvement factor (SIF). This makes it a versatile choice for various imaging tasks.
Area of Science:
- Medical Imaging
- Radiography Technology
Background:
- Digital radiography (DR) systems offer advantages over film-screen detectors.
- Fixed DR systems limit antiscatter grid selection at the time of purchase.
Purpose of the Study:
- To experimentally evaluate antiscatter grids for fixed and portable DR systems.
- To compare grid performance under varying scatter conditions and tube voltages.
Main Methods:
- Six grids for a fixed DR system and three for a portable DR system were tested.
- Evaluations used primary transmission, scatter fraction, and signal-to-noise improvement factor (SIF).
Main Results:
- Grids with low atomic number interspace/cover materials showed up to 15% higher SIF than aluminum.
- A 12:1 grid ratio consistently yielded the highest SIF across tested conditions.
Conclusions:
- A 12:1 grid with low atomic number materials is recommended as a general-purpose, non-removable grid for fixed DR systems.
- This grid selection optimizes performance across diverse imaging scenarios.