Certified Imaging Informatics Professional (CIIP) Practice Exam 2025 – All-in-One Guide to Exam Success!

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What is the typical CT number for lung areas on a CT image?

-400

-800

The typical CT number for lung areas on a CT image is -800. This arises from the way CT imaging works, where different tissues and substances within the body have varying densities, which result in specific CT numbers on the Hounsfield scale. Air, which is present in the lungs, is very low in density compared to other tissues. As a result, air-filled structures like the lungs will have a CT number around -800, indicating their low density relative to water, which has a CT number of 0.

Understanding the properties of the tissues helps in the interpretation of CT images. For instance, soft tissues appear closer to 0, while fat may have a CT number ranging from -100 to -200, and denser materials, like bone, will show positive CT numbers, often in the range of +400 to +1000. Thus, knowing that lung tissue is one of the least dense structures helps solidify why the correct CT number is -800.

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