What is the primary use of CNR in imaging?

The primary use of Contrast-to-Noise Ratio (CNR) in imaging is to determine the contrast for large objects. CNR is a measure that evaluates the visibility of an object's features against the background noise in an image. It is particularly important in assessing how clearly large structures can be distinguished from their surrounding environment.

In imaging techniques, such as fluoroscopy, CNR helps in determining how effectively large anatomical structures can be visualized. High CNR values indicate that there is a strong contrast between the large object and the background, making it easier to identify and analyze these structures within the image. Therefore, a thorough understanding of CNR is essential for optimizing imaging protocols and achieving the best diagnostic outcomes.

Other choices may involve aspects of imaging, such as assessing safety, calculating dose, or enhancing clarity for small details, but they do not specifically focus on the contrast perception for larger objects, which is the primary context of CNR application.