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Problems with X-ray Imaging – Solutions! 1) Image Intensification An intensifying screen is placed either side of the p_____________ film When _____ photons hit crystals in this screen, the atoms become excited, then relax back o their ground state and fluoresce (emit visible light photons) Photographic film is much more efficient at absorbing these v______ light photons rather than x-ray photons This gives more con_____ but not a clearer image Also, less x-rays are required so less ex_______ for patient 2) A Contrast Medium is applied Patients can be asked to swallow, are given an enema, or are injected with an X-ray absorbing substance. These will be substances with a high atomic number e.g. Barium Sulphate. This is called a Barium meal and it allows soft tissues to be imaged. 3) Use a Photocathode (make it Digital) Rather than using photographic film, a phosphor screen backed by a photocathode is used. When visible light photons hit the photocathode, an electron is produced, creating an electrical signal that is sent to a computer. This allows a changing image to be viewed. Problems with X-ray Imaging – Solutions! 1) Image Intensification An intensifying screen is placed either side of the p_____________ film When _____ photons hit crystals in this screen, the atoms become excited, then relax back o their ground state and fluoresce (emit visible light photons) Photographic film is much more efficient at absorbing these v______ light photons rather than x-ray photons This gives more con_____ but not a clearer image Also, less x-rays are required so less ex_______ for patient 2) A Contrast Medium is applied Patients can be asked to swallow, are given an enema, or are injected with an X-ray absorbing substance. These will be substances with a high atomic number e.g. Barium Sulphate. This is called a Barium meal and it allows soft tissues to be imaged. 3) Use a Photocathode (make it Digital) Rather than using photographic film, a phosphor screen backed by a photocathode is used. When visible light photons hit the photocathode, an electron is produced, creating an electrical signal that is sent to a computer. This allows a changing image to be viewed.