The HU for Air is

Study for the Image Modalities Test. Learn with flashcards and multiple choice questions, each comes with hints and explanations. Get ready for your credentialing exam in the field of medical imaging!

Multiple Choice

The HU for Air is

Explanation:
Hounsfield units measure how strongly a material attenuates X-rays compared to water. Air attenuates far less than water, so its value sits at the far negative end of the scale. Water is the reference point, bones attenuate much more and appear at the far positive end. So air has the most negative HU on the standard CT scale.

Hounsfield units measure how strongly a material attenuates X-rays compared to water. Air attenuates far less than water, so its value sits at the far negative end of the scale. Water is the reference point, bones attenuate much more and appear at the far positive end. So air has the most negative HU on the standard CT scale.

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