Chest DR image of a pediatric participant in the supine APP group (unit A).The image shown is that of a 38-month-old female with a height of 109 cm, a weight of 15 kg, and a BMI of 12.63 kg/m2. The ESD value was 0.07 mGy, the DAP value was 0.22 dGy•cm2, the VGAS was 29, the right LFA was 64.80 cm2, the left LFA was 50.50 cm2, the total LFA was 115.30 cm2, and the LD was 11.50 cm.