CAMRT Radiography Practice Exam

Which parameter primarily influences image contrast in radiography?

1. Window level

2. Window width

3. Tube current

4. Exposure time

The correct answer is: Window width

Image contrast in radiography refers to the difference in density between different areas of an image, allowing for distinctions between various tissues or structures. The primary parameter that influences image contrast is window width. Window width determines the range of pixel values (or shades of gray) that are displayed on a radiographic image. A narrow window width enhances contrast by highlighting differences in tissue density within a limited range, making subtle differences more apparent. Conversely, a wider window width encompasses a broader range of densities, leading to a more uniform appearance and reduced contrast. In summary, adjusting the window width effectively manipulates how the varying densities of structures are visualized on the monitor, directly impacting the contrast of the resulting image. This understanding of window width is crucial for optimal image interpretation in radiography.