Science & Education
1. A 25-year-old woman undergoes cerebral angiography and a CT scan of the brain involving 2-mm-thick sections that include the orbits. What is the patient’s estimated lifetime risk probability for radiation-induced cataracts?
A. 0% B. 0.01% C. 0.1% D. 1.0% E. 10.0%
2. Which of the following statements best characterizes radiation-induced cataracts? A. Cataracts begin in the anterior portion of the lens. B. A dose of 1 Gy over 5 years is likely to produce a cataract. C. Prescription eyeglasses protect from 80% of the dose to the lens from diagnostic x–rays. D. Vision-impairing cataracts are preceded by asymptomatic opacities in the lens.
3. Which of the following statements concerning radiation-induced cataracts are true? (Select all that apply.) A. A cataract is a stochastic effect. B. The minimum single acute dose of x rays that will produce a cataract is 2 Gy. C. A single dose of radiation is more likely to induce a cataract than the same amount of radiation administered in 10 fractions. D. For a given dose, neutrons are more effective than gamma rays in producing cataracts.
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