Radiologic Technologist Practice Exam

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What is the unit of measure for display monitor luminance?

Cd/m2
mGy/s
Lp/mm
Lines/cm

The correct answer is: Cd/m2

The unit of measure for display monitor luminance is candela per square meter (Cd/m²). This unit quantifies the brightness of a display screen, indicating how much light is emitted in a specific direction from a surface area of one square meter. Understanding luminance is crucial for radiologic technologists, as proper display monitor settings are essential for accurately interpreting medical images. Luminance affects visibility and clarity, impacting diagnostic accuracy. If the luminance is not set correctly, critical details may be missed, leading to misdiagnosis or improper treatment. The other choices pertain to different concepts: - mGy/s measures the rate of radiation exposure, relevant for assessing patient dosages but not for display characteristics. - Lp/mm refers to line pairs per millimeter, a measure of resolution in imaging systems, indicating the ability to distinguish between closely spaced lines. - Lines/cm is another measure related to resolution, focusing on the number of lines that can be displayed in one centimeter. Thus, knowing that luminance is expressed in Cd/m² helps reinforce the importance of image quality in radiology, while the other options cover different technical aspects of radiologic imaging.