What is the impact of increasing the OID on spatial resolution?

Increasing the Object-to-Image Distance (OID) typically leads to a decrease in spatial resolution. This occurs because as the OID increases, the amount of scatter radiation that reaches the image receptor also increases. This scattering can blur the image and reduce the sharpness of the details captured, leading to a less defined image.

Moreover, with greater OID, the geometry of the image acquisition changes, which can cause a reduction in the effective resolution. In radiographic imaging, maintaining a low OID is crucial for achieving high-quality images with better detail visibility; thus, reducing OID is often a technique employed to improve clarity and resolution.

The other options suggest that increasing the OID either improves resolution, has no effect, or enhances sharpness, which does not align with the principles of image acquisition and the understanding of how OID influences the clarity and definition of images. Therefore, the connection between increased OID and decreased spatial resolution is well-established in imaging practices.