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Typical Hounsfield unit (HU) values are −20 to −150 HU for adipose tissue and 20 to 50 HU for kidney. If an adrenal mass is less than 0 HU on unenhanced CT, it is almost certainly a benign adenoma.
- What is Hounsfield unit in a CT scan?
- What does high Hounsfield unit mean?
- Is CT number the same as Hounsfield unit?
- Why are Hounsfield Units important?
What is Hounsfield unit in a CT scan?
Definition/Introduction. The Hounsfield unit (HU) is a relative quantitative measurement of radio density used by radiologists in the interpretation of computed tomography (CT) images. The absorption/attenuation coefficient of radiation within a tissue is used during CT reconstruction to produce a grayscale image.
What does high Hounsfield unit mean?
The HU scale ranges from -1000 to +1000, with water having a Hounsfield unit of 0. Tissues with a high HU (such as bone) absorb more x-rays than tissues with a low HU (such as lung tissue). The application of HU allows radiologists to more accurately interpret CT images.
Is CT number the same as Hounsfield unit?
The Hounsfield scale /ˈhaʊnzˌfiːld/, named after Sir Godfrey Hounsfield, is a quantitative scale for describing radiodensity. It is frequently used in CT scans, where its value is also termed CT number.
Why are Hounsfield Units important?
The Hounsfield unit is a way to characterize radiation attenuation in different tissues and thus making it easier to define what a given finding may represent. It measures radiodensity and is a quantitative scale.
