What SID is recommended for plantodorsal axial calcaneus radiographs?

The recommended Source-to-Image Distance (SID) for plantodorsal axial calcaneus radiographs is 40 inches. This distance helps to achieve optimal image quality and reduces distortion of the anatomical structures being visualized.

Using a SID of 40 inches provides a good balance between magnification and sharpness, which is crucial for accurately assessing the calcaneus. Proper alignment of the x-ray beam and the receptor at this distance ensures that the anatomy is well-projected, allowing for a clear view of the heel bone's features. This is particularly important in radiography to avoid misinterpretation of pathologies or fractures.

SIDs that are significantly shorter or longer could lead to increased magnification or decreased resolution, potentially compromising the diagnostic quality of the radiograph. Therefore, maintaining the recommended 40-inch SID is essential for obtaining the best possible images when performing plantodorsal axial projections of the calcaneus.