Which anode angle should be used if maximum spatial resolution is desired?

To achieve maximum spatial resolution in radiography, a smaller anode angle is preferable. When the anode angle is reduced, the effective focal spot size decreases, allowing for sharper and more defined images. A 7-degree anode angle minimizes the size of the projected focal spot, which directly enhances the spatial resolution of the radiographic image.

Smaller angles produce a more isotropic x-ray beam with a tighter focus, leading to better detail and contrast in the resulting images. This is critical for imaging structures that require high detail, such as in orthopedics or certain diagnostic scenarios. In contrast, larger anode angles reduce spatial resolution due to a larger effective focal spot size, resulting in more blurring and less clarity in image representation. Therefore, the choice of a 7-degree angle is optimal for the highest spatial resolution.