The chest radiograph was one of the first clinical examinations to use the then-new technology of diagnostic radiography.^[1]It remains the most common x-ray examination and one of the most difficult examinations to interpret. With careful evaluation, it yields a large amount of anatomic and physiologic information, but it is difficult and sometimes even impossible to extract the information that it contains. The major variables that determine what can be learned from the chest x-ray include the technical factors (milliamperage [mA], …