Which of the following factors can affect image magnification in radiography?

Image magnification in radiography is primarily influenced by the Source-to-Image Distance (SID). When the distance between the X-ray tube (the source) and the imaging receptor (the image) changes, it directly affects how much the image of the anatomy appears enlarged or reduced.

When SID is increased, the size of the radiographic image tends to decrease due to the geometric principles of radiation propagation, which reduce the divergence of the X-ray beam. Conversely, a shorter SID increases the magnification of the anatomical details because the X-rays diverge more, causing a larger projection of the object on the film or digital detector.

This principle is fundamental in radiographic technique, especially when precise measurements are necessary, as in radiography for orthopedic or dental purposes where accurate representation is crucial for diagnosis and treatment planning. Understanding the impact of SID on image magnification helps radiographers optimize their technique for the best possible image quality.

Other factors mentioned, such as exposure time, film type, and patient age, do not have a direct influence on the geometric magnification of the image. Exposure time is related to the amount of X-ray exposure and image density, film type impacts image resolution and contrast, while patient age can influence factors like body composition or