What is the range of the CT number for fat?

The range of the CT number, also known as the Hounsfield units, for fat typically falls between -100 to -50. This is a result of the way different tissues attenuate X-rays during a computed tomography scan. Fat has a lower density compared to water, which is assigned a value of 0 Hounsfield units.

The negative values for fat reflect its lower attenuation coefficient when X-rays pass through it compared to denser tissues such as muscle or bone. Knowing this range is particularly important in medical imaging as it aids in differentiating fat from other tissues during the interpretation of CT scans. Recognizing the specific CT number for fat can help in assessing various conditions, analyzing the composition of lesions, and formulating treatment plans.

Other ranges mentioned do not accurately reflect the known properties of fat within the realm of CT imaging.