Photofluorography
Photofluorography (sometimes called just fluorography) is photography of X-ray images from fluorescent screen.[1] It is commonly used in some countries for chest X-ray screening, e.g. to diagnose tuberculosis or lung cancer (see Abreugraphy for more information on such usage of this technique).
METHOD OF IMAGE FORMATION IN PHOTOFLUOROGRAPHY'
X-Ray beam from the tube gets attenuated by the patient producing a transmited radiation intensity corresponding to the part of the body traversed by the x-ray beam. Transmitted intensities now falls on the photocathode stimulating it to produce electrons in quantities external to the lights intensities emitted by the input. This is caused by the formation of a light image of the transmitted radition pattern. Eectron from the photocathode are accelerated and focused electronically out on the output phosphor which emits lights as a result of electron bombardment. This shows a magnified image of what appears on the input phosphor. The semitransparent mirror splits the image inwhich one part is focused by te camera lens unto the film to form the image. The image size depends on the focal length of the camera lens. At the same time, the TV camera lense focuses the light to form an image on the TV camera photorreceptor where the image is transformed to a complex elctronic signal and sent to the electronic image distrubutor. This then passes the image tot ehvarious display or recording deveices e.g. the videotape recorder, kinescopr, TV ,oitor or display for cine recording and video memory.