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A significant portion of the dose received by a patient during a radiographic x -ray examination results from absorption of the beam in the various patient support structures through which the beam must pass. New materials are becomingavailable that offer reduced absorption of x -rays while providing the strength and rigidity required. One such material isCFM. Comparative measurements on CFM and conventional materials (CM) under laboratory and practical conditions arepresented. These measurements address the effect of these materials on patient dose, scattered radiation, and contrast.IntroductionNew techniques now being developed or applied in diagnostic radiology offer the potential of reducing patient exposure without adversely affecting the diagnostic quality of the radiograph. These techniques include the use of rare earthscreens, new scatter rejection techniques, x ray spectrum shape optimization, and low attenuation post -patient support materials. One such material is carbon fiber composite material (CFM)2 available in the form of fixed and movable tabletops, cassette faces, Bucky covers, and rapid film changer pressure plates and dust covers. |
