What is the best method to evaluate grid uniformity and alignment?

Producing a radiograph of a homogeneous phantom is the best method to evaluate grid uniformity and alignment because it provides a controlled and consistent way to assess the performance of the grid under standardized conditions. When using a homogeneous phantom—an object with uniform density—the resulting radiographic image can reveal any variations in the grid’s performance. These variations may indicate misalignment or discrepancies in grid uniformity, which are critical for ensuring optimal image quality.

This method allows for the quantification of how effectively the grid is working across the entire image area. Any imperfections or misalignments will show up as inconsistencies in the exposure across the phantom, making it easier to identify and address issues. As a result, this approach is the most reliable way to evaluate grid performance and correct any defects that can affect diagnostic imaging outcomes.

Other methods, while potentially useful for evaluating different aspects of imaging systems, do not provide the same level of specific feedback regarding grid performance.