The HU for Air is

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Study for the Image Modalities Test to enhance your knowledge of various imaging techniques. Prepare with flashcards and multiple choice questions, each accompanied by hints and explanations. Get ready to ace your exam!

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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