Final answer:
The statement that is not true is that if a pediatric patient is in respiratory distress, a chest radiograph should be obtained in the AP projection rather than in the standard PA projection.
Step-by-step explanation:
All of the statements regarding pediatric positioning are true except B. If a pediatric patient is in respiratory distress, a chest radiograph should be obtained in the AP projection rather than in the standard PA projection.
In pediatric patients, the standard PA projection is preferred for chest radiography to reduce radiation exposure to sensitive structures like the breasts and thyroid gland. However, in cases of respiratory distress, an AP projection may be necessary to minimize the movement of the patient during the scan.
For radiography of the kidneys, the CR should be directed midway between the diaphragm and symphysis pubis. Radiography of pediatric patients with a myelomeningocele defect should be performed in the supine position.