Question

When used as a contrast medium, CO₂ appears as which of the following on x-ray?

1) White
2) Black
3) Gray
4) Colorless

Answer 1

The Correct option is 2). In medical imaging, CO2 used as a contrast medium appears black on an X-ray due to its low density, which results in less absorption of X-ray radiation compared to denser materials.

Step-by-step explanation:

When used as a contrast medium in medical imaging, CO₂ appears black on an x-ray. This is due to its low density and relatively low atomic number, which means it does not absorb much of the X-ray radiation. On X-ray images, denser materials, such as bones, appear white or light-toned because they absorb more radiation, while less dense materials, like gases, appear darker or black because they absorb less radiation.