According to the NCRP Report #160

According to the NCRP Report #160,

A) individual effective doses have nearly quadrupled since the early 1980s.
B) individual exposures have increased principally due to increased utilization of digital imaging technologies.
C) the effective dose per individual in the United States primarily increased because of increased fluoroscopic interventional procedures and CT scans.
D) individual exposures have decreased due to improved technology and more discrete utilization.