title: A method to absorb scattered radiation without attenuation of the primary beam.
abstract: A method is presented for improving image quality by decreasing the scattered radiation. Two pairs of lead plates, one above and one below the patient, move in arcs with a common pivot point, the focal spot of the x-ray tube. The lower plates are separated by a 1-cm slot. The upper plates are also separated by a slot, the edges of which lie on common radii from the focal spot. The image is formed by moving the slots so that the X-ray beam emerging from the object sweeps across the film with a uniform speed during the exposure.
mesh_terms: D006801:Humans; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement; D012542:Scattering, Radiation; D013679:Technology, Radiologic / Q000295:instrumentation*; D014965:X-Rays