Which method is best for assessing blur caused by geometric factors?

Using specific test phantoms is the best method for assessing blur caused by geometric factors because test phantoms are designed to provide a controlled way to analyze and quantify image quality. Specifically, phantoms can simulate various anatomical structures and densities, allowing for the evaluation of different types of blur that can occur due to geometrical inaccuracies such as patient positioning or equipment alignment.

Test phantoms facilitate precise assessment by providing known references for spatial resolution and image sharpness. When using these phantoms, different geometric configurations can be evaluated systematically to identify how factors like distance from the X-ray source, angling, or focusing affect image clarity. This method allows for the isolation and measurement of specific blurring effects, which is essential for optimizing imaging protocols and ensuring high-quality diagnostic outputs.

The other methods mentioned may provide some information about image quality overall, but they do not specifically target the geometric factors that contribute to blur, making them less effective in this context.