The contrast resolution of a CT system is recorded in which units?

The contrast resolution of a CT system is measured in Hounsfield units (HU), which provide a standardized way to quantify the density of different tissues as displayed in the images. Hounsfield units are defined based on water being assigned a value of 0 HU and air being assigned a value of -1000 HU, while denser materials such as bone have positive values greater than 0 HU. This scale is crucial for differentiating between various tissues based on their density, which plays a significant role in diagnosing conditions and analyzing CT images.

In contrast, line pairs per centimeter typically relate to spatial resolution rather than contrast resolution, thus are not applicable to this measurement. Electron volts are units used primarily in the context of energy, particularly in regard to photons and particles, not directly related to CT imaging. Milliamperage (mA) refers to the tube current in the CT scanner, affecting the quantity of radiation produced and, indirectly, image quality, but does not specifically measure contrast resolution. Therefore, Hounsfield units are the appropriate unit of measurement for contrast resolution in computerized tomography.