Why place patient between X-ray tube and film cassette?

The patient is placed between the X-ray tube and the film cassette in order to ensure that the X-rays pass through the patient's body and are captured on the film. This is important because it allows the radiographer to obtain a clear image of the patient's anatomy.

When the X-ray tube is turned on, it emits a beam of X-rays. These X-rays travel through the patient's body and interact with the atoms and molecules in the body. The X-rays are either absorbed or scattered by these atoms and molecules, depending on their density. The denser the tissue, the more X-rays are absorbed.

The X-rays that pass through the patient's body eventually reach the film cassette. The film cassette contains a piece of film that is sensitive to X-rays. When the X-rays strike the film, they cause a chemical reaction that produces an image. The denser the tissue, the more X-rays are absorbed, and the less light reaches the film. This results in a darker area on the film, while less dense tissue appears lighter.

By placing the patient between the X-ray tube and the film cassette, the radiographer can obtain a clear image of the patient's anatomy. This image can then be used to diagnose and treat medical conditions.