How does increasing the size of the output screen relative to the input screen affect image brightness?

Increasing the size of the output screen relative to the input screen enhances image brightness due to a phenomenon known as "image magnification." When the output screen is larger while maintaining the same amount of light input from the input screen, the total area over which that light is spread increases, resulting in a lower density of light per unit area on the output screen. However, the actual visual perception of brightness can improve because the larger screen allows for the display of more photons which can enhance detailed visibility and make the image appear brighter, particularly in terms of contrast and perceived clarity.

This effect is especially important in fluoroscopy where dynamic imaging is often performed. Larger output images can enhance the clinician's ability to visualize and interpret the nuances of the anatomical structures being examined, helping to improve diagnostic accuracy. Hence, this relationship between the sizes of the input and output screens is crucial in understanding the dynamics of image brightness in medical imaging practices.