What Is Hu in Radiology

The Hounsfield unit (HU) is a relative quantitative measurement of radio density used by radiologists in the interpretation of computed tomography (CT

What is HU value?

The Hounsfield Units (HU) make up the grayscale in medical CT imaging. It is a scale from black to white of 4096 values (12 bit) and ranges from -1024 HU to 3071 HU (zero is also a value). It is defined by the following: -1024 HU is black and represents air (in the lungs).

What do Hounsfield units measure?

Measuring computed tomography (CT) attenuation in Hounsfield units (HU) has been proposed as an alternate means of assessing bone quality. HUs measure attenuation of tissue using a linear scale with 0 defined as water and -1000 defined as air.