What are the black, white and grey regions of the x ray?
The x-ray is a negative image. The black areas represents soft human tissue that lets the rays pass through. Examples: Lungs, The air spaces within the bowel (in an abdominal x-ray). The white areas represent dense human tissues that do not let the x rays to pass through. Example: bones. The grey areas are tissues that allow part of the x ray to pass through. Examples: Liver, kidney, muscle. The final image is a composite shadow of the passage of the shadow through the human body. When there is an irregularity in the pattern of the image the doctor is able to diagnose the problem.
