How is an x-ray image produced?

An x-ray image (also known as radiograph) is produced when a small amount of radiation passes through a body part and is recorded on film or computer to produce a black and white anatomical image. Areas that are more difficult for x-rays to penetrate such as bone appear white on the image and areas that x-rays penetrate more easily such as lungs or other areas filled with air appear black. Soft tissue, vessels and organs appear as various shades of grey on the x ray image depending on their composition.