What generally happens to radiation dose as the S-value increases?

When considering the relationship between radiation dose and the S-value, it's crucial to understand the implications of changes in the S-value in imaging and fluoroscopy contexts. The S-value, often referred to as the dose efficiency parameter, represents the signal-to-noise ratio in imaging systems.

As the S-value increases, it generally indicates that the system is becoming more efficient in producing a useful signal relative to background noise. This means that less radiation is needed to achieve a satisfactory image quality, leading to a decrease in the radiation dose required for imaging. Consequently, as the dose decreases, the noise level relative to the signal often increases, potentially meaning that while the image may still be acceptable, it could have more graininess or clarity issues than when a higher dose is utilized.

This relationship emphasizes the balance between radiation exposure and the quality of the resulting images. When operating at higher S-values, the aim is to optimize image quality while minimizing patient exposure to harmful radiation, aligning with the principles of radiation safety and responsible imaging practices.