Figure 2. Posteroanterior(PA) chest radiographs obtained with computed radiography and direct digital radiography. (a) Direct digital radiography: female, 47 years old, 125 kVp, focus to skin distance (FSD) = 155 cm. (b) Computed radiography: male, 28 years old, 125 kVp, FSD = 151 cm. Both images satisfy the quality criteria for PA chest radiographs given in the European Guidelines [7].