What is a basic difference between a radiograph and a fluoroscopic image?

The distinction between a radiograph and a fluoroscopic image centers on the nature of the images produced by these two techniques in radiographic testing. Fluoroscopic imaging generates continuous, real-time images of the internal structures of an object or body, allowing for observation of motion and changes within the subject. These images are typically positive, meaning that the areas exposed to radiation appear bright, whereas the areas that are not exposed appear darker.

On the other hand, radiographs are static images often captured on film or digitally, creating a negative transparency. In a radiograph, denser materials absorb more radiation and appear lighter, while less dense areas appear darker, presenting an inverse representation of the actual structures.

Therefore, the correct answer emphasizes that fluoroscopic images are positive, which aligns with the way these images are displayed and interpreted, making this distinction fundamental in understanding how both imaging techniques function in radiographic testing.