American Registry of Radiologic Technologists (ARRT) Practice Exam

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Prepare for the American Registry of Radiologic Technologists Test with engaging quizzes and detailed explanations. Boost your test readiness with multiple-choice questions designed to enhance your knowledge and confidence.

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What type of contrast material is specifically used in myelograms?

Ionic contrast
Non-ionic contrast
Air contrast
Metallic contrast

The correct answer is: Non-ionic contrast

The use of non-ionic contrast material in myelograms is particularly important due to its favorable properties compared to other types. Non-ionic contrast agents have a lower osmolality, which means they are less likely to cause adverse reactions, such as discomfort or allergic responses. This is crucial in myelography, where the contrast material is injected into the spinal canal to enhance the visualization of the spinal cord and nerve roots during imaging. Non-ionic contrast materials also have better diffusion characteristics, which allow for clearer imaging of the structures within the central nervous system. This helps in achieving optimal diagnostic results without causing excessive irritation or complications at the injection site. The safety profile and enhanced imaging capabilities make non-ionic contrast the preferred choice in myelographic procedures. In contrast, ionic contrast agents can lead to higher rates of complications and discomfort due to their higher osmolality. Air contrast is not typically used in myelograms as it can result in artifacts and obscure important anatomical details. Metallic contrast is not utilized in myelography due to its different physical and chemical properties that are not suitable for soft tissue imaging.