What happens to recorded detail when OID increases?

When the object-to-image receptor distance (OID) increases, recorded detail is inversely affected, leading to a decrease in recorded detail. This occurs because an increase in OID results in more scatter radiation reaching the image receptor, which reduces contrast and sharpness. Additionally, the image becomes less sharp due to the increased distance between the object being imaged and the image receptor.

When OID increases, the x-ray beam has to diverge more as it travels from the object to the receptor, which can cause a blurring effect and reduce the sharpness of the recorded image. This is why recorded detail is inversely related to OID—increasing the distance tends to lead to a loss in the precision and clarity of the radiographic image.