CAMRT Radiography Practice Exam

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Study for the CAMRT Radiography Exam. Prepare with our comprehensive quiz that features multiple choice questions along with hints and explanations designed to enhance your understanding. Get ready to excel in your exam!

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The attenuation of a specific tissue relative to water is referred to as what?

CT number
Window width
Echo coefficient
Positron absorption

The correct answer is: CT number

The attenuation of a specific tissue relative to water is identified by the CT number, also known as the Hounsfield unit. This term is used in computed tomography (CT) imaging to quantify the level of X-ray attenuation as compared to water, which is assigned a CT number of 0. Each type of tissue attenuates X-rays differently based on its density and composition, resulting in varying levels of brightness on the CT images. For instance, air has a negative CT number, while bone has a positive CT number that is significantly higher than that of water. This system allows radiologists to differentiate between various types of tissues and abnormalities based on their CT attenuation properties. The other choices refer to different concepts. Window width describes the range of Hounsfield units that are displayed on a CT image, affecting the contrast. The echo coefficient typically pertains to ultrasound and describes how much sound is reflected by different tissues. Positron absorption is related to PET imaging rather than CT imaging and does not refer to the attenuation of specific tissue types relative to water.