With proper technique, the standard 6-ft. posterior-anterior radiograph of the chest usually provides a satisfactory soft-tissue study of the cervical portion of the carotid arteries. In a random study of 1,000 chest radiographs of persons more than 40 years of age, 216 individuals demonstrated carotid calcification. There is a rising frequency with aging. For corresponding age groups, carotid calcification is somewhat more frequent in males than in females. In individuals more than 80 years of age, aortic arch calcification is practically universal, and carotid calcification is visible in 70% or more of both sexes.
Ring BA, Eddy WM. Calcification of Carotid Arteries: Routine Radiographs of the Chest. JAMA. 1963;184(11):866–869. doi:https://doi.org/10.1001/jama.1963.03700240058009
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