How does the image on the image intensifier's output phosphor compare with the image on its input phosphor?

How does the image on the image intensifier's output phosphor compare with the image on its input phosphor?

• A. The output image is larger and inverted.
• B. The output image is minified, brighter, and inverted.
• C. The output image is identical to the input image.
• D. The output image is duller and upright.

Answer: (B)

The output image on the image intensifier's output phosphor is indeed minified, brighter, and inverted compared to the image on its input phosphor.

In the image intensifier, the system is designed to enhance the brightness of the image. The input phosphor converts incoming x-ray photons into visible light photons, and this light is then focused onto a smaller output phosphor. This process creates an image that is minified, meaning it occupies a smaller area than the input image, allowing for a more concentrated and brighter output.

Additionally, the output image is inverted due to the way light photons are directed within the intensifier. The geometry of the system causes the image to flip both horizontally and vertically. Therefore, the output you receive is not only more intense due to the reduced area but also reversed from how it initially appeared on the input.

Recognizing these characteristics is essential for understanding the function of image intensifiers in radiographic imaging.