Encephalogram and X-ray photograph

Encephalogram noun - An X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast.

X-ray photograph and encephalogram are semantically related. In some cases you can use "X-ray photograph" instead a noun "Encephalogram".

X-ray photograph noun - A radiogram made by exposing photographic film to X rays; used in medical diagnosis.

Encephalogram and X-ray photograph are semantically related. Sometimes you can replace term "Encephalogram" with "X-ray photograph", this terms are similar.