Figure 1: Screen shots of the CT Gently app running in the CT mode (left and middle panels) and CBCT mode (right panel), respectively. Specifically, a head CT scan is shown on the left with the mean radiation dose to the brain tissue and relative cancer risk calculated for the reference and optimized settings, respectively. Similarly, a chest CT scan and an abdominal CBCT scan are illustrated in the middle and right with lung tissue and red bone marrow as the critical structures, respectively.

Figure 2: Estimated organ doses as a function of age at time of study for the girls of 1 to 20 years old using CT Gently app. Specifically, (a), (c) and (e) indicate the doses to the brain, the lungs, and the red bone marrow, respectively from a reference CT scan as well as an optimized CT scan. The corresponding organ doses from CBCT scans are shown in (b), (d), and (f), respectively.

Figure 3: Estimated excessive cancer risks as a function of age at time of study for the girls of 1 to 20 years old using CT Gently app. Specifically, (a), (c) and (e) indicate the excessive risks for the brain tumor, the lung tumor, and the leukemia, respectively from a reference CT scan as well as an optimized CT scan. The corresponding excessive risks from CBCT scans are shown in (b), (d), and (f), respectively.