Increasing the OID from 1 inch to 2 inches will result in:

Increasing the object-to-image distance (OID) generally results in decreased spatial resolution. Spatial resolution refers to the ability of an imaging system to distinguish small details or closely spaced objects.

As the OID increases, the geometric unsharpness also increases because the spread of the X-ray beam becomes larger as it travels toward the image receptor. This larger beam spread causes a blurring effect on the image since the X-rays diverge more before reaching the detector. Consequently, with a greater OID, fine details may not be as sharp or clearly defined, leading to a reduction in spatial resolution.

In imaging, a lower OID is typically preferred because it minimizes this geometric unsharpness, resulting in sharper images with better detail visibility. Therefore, when the OID is increased from one inch to two inches, the resulting effect is decreased spatial resolution. Other choices, like no change or complete loss of resolution, don’t accurately capture the relationship between OID and spatial resolution as explained.