CAMRT Radiography Practice Exam

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What is the CT number for plain fat typically measured at?

  1. -75

  2. -25

  3. 0

  4. 25

The correct answer is: -75

The CT number, also known as Hounsfield Unit (HU), is a quantitative measurement that reflects the attenuation properties of a substance relative to water. Plain fat typically measures around -75 Hounsfield Units on a CT scan. This negative value indicates that fat is less dense than water, which has a CT number of 0. Fat's lower density results in a lower CT number compared to other soft tissues and materials. In this context, the negative45 range for fat helps radiologists differentiate between various types of tissues in the body and evaluate the composition of lesions or abnormalities. By understanding the CT numbers associated with different tissues, healthcare professionals can improve diagnostic accuracy and make more informed decisions regarding patient treatment and management.

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