Chest DR image of a pediatric participant in the standing APP group (unit A).The image shown is that of a 40-month-old female with a height of 105 cm, a weight of 17 kg, and a BMI of 15.42 kg/m2. The ESD value was 0.06 mGy, the DAP value was 0.20 dGy•cm2, the VGAS was 29, the right LFA was 68.95 cm2, the left LFA was 49.82 cm2, the total LFA was 118.77 cm2, and the LD was 12.77 cm.