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Stationary and moving mammography grids: comparative radiation dose
AJR. American Journal of Roentgenology
|September 1, 1986
Summary
Using a grid during mammography significantly increases breast radiation dose. While both stationary and moving grids raise radiation exposure, moving grids avoid visible grid lines on images, potentially influencing device choice.
Area of Science:
- Radiology
- Medical Imaging
- Radiation Physics
Background:
- Mammography is a crucial tool for breast cancer screening.
- The use of grids in mammography aims to improve image quality by reducing scattered radiation.
- Different grid types may impact radiation dose and image characteristics.
Purpose of the Study:
- To compare the effects of stationary and moving grids on mammography radiation dose and image quality.
- To evaluate the visibility of grid lines in mammograms produced with different grid types.
Main Methods:
- Mammography was performed on 46 women using three techniques: no grid, a stationary grid, and a moving grid.
- Mean breast gland dose was measured for each technique.
- Image quality was assessed, focusing on the presence of grid lines.
Main Results:
- The mean breast gland dose increased two to fourfold when using either a stationary or a moving grid compared to mammography without a grid.
- Grid lines were visible on images acquired with the stationary grid.
- Grid lines were not apparent on images acquired with the moving grid.
Conclusions:
- Both stationary and moving grids significantly increase radiation dose in mammography.
- Moving grids offer an advantage by producing images free of visible grid lines.
- The choice between stationary and moving grids may depend on balancing radiation dose considerations with image artifact preferences.