Which statements are true regarding testing for screen/film contact?

• A. 1 and 2
• B. 1 and 3
• C. 2 and 3
• D. 1, 2, and 3

Answer: (C)

Testing screen-film contact emphasizes how tightly the film sits against the phosphor screen, because any gap lets light spread during exposure and blurs the image, reducing spatial resolution. The standard way to check this is to place a high-contrast test pattern, like a wire mesh, between the screen and the film and make a radiographic exposure as you would for real exams. When contact is good across the cassette surface, the pattern appears as sharp lines with uniform density elsewhere. If there are gaps, those lines become blurred or bleed into the surrounding area, clearly showing where contact is insufficient. So the true statements describe using a patterned test target to visualize contact and interpret the resulting image by looking for sharpness of the pattern and overall uniformity. Any statement that contradicts this approach or the interpretation of the results wouldn’t fit with how screen-film contact testing is actually performed.