What is the typical pattern of low-dose CT screening interval for at-risk individuals?

• A. Annual screening.
• B. Biannual screening.
• C. Quarterly screening.
• D. One-time screening only.

Answer: (A)

Annual screening is used because the risk of developing and progressing lung cancer remains elevated year after year in high-risk individuals, and yearly imaging best balances early detection with minimizing missed cancers and radiation exposure. Evidence shows that repeating the low-dose CT each year detects cancers at smaller, more curable stages and reduces mortality, whereas a one-time screen misses cancers that develop later and longer intervals risk missing evolving disease. More frequent screening increases radiation exposure without proven added mortality benefit, and less frequent screening misses cancers. So the typical pattern is to screen once every year.