CLO09: Differentiate between size and shape distortion.
Size distortion is the increase in size of the image’s anatomical part compared to the part’s actual size and must occur over the entire image. SID and OID are factors that affect magnification and especially size distortion. Sometimes size distortion will always occur because of OID. SID can affect magnification because as it increases, size distortion decreases. There is an inverse relationship. Shape distortion is the misrepresentation of the image’s shape. The image can then be elongated or foreshortened. A few errors that can cause shape distortion is the misalignment of the central ray of the x-ray tube, anatomical part or image receptor.
Rad Radiography 