What is the term for the unwanted information in a CT image due to various factors, including photon insufficiency?

The term for unwanted information in a CT image resulting from various factors, including photon insufficiency, is noise. In the context of imaging, noise refers to random variations in the image data that can obscure or distort the true signal. This is particularly evident when there is insufficient data or low radiation exposure, leading to fluctuations that do not correspond to the actual structures being imaged. Noise can result in granularity or blurriness of the image, making it difficult to identify fine details.

Understanding noise is critical in CT imaging, as it impacts the overall quality of the images and can affect diagnostic outcomes. Reducing noise often involves optimizing scan parameters and ensuring adequate dose delivery.