What's the difference between dr chest film and x-ray irradiation of lung?

Dr is the abbreviation of digital direct imaging system, which is also often written as DR. Compared with traditional X-ray imaging, DR has the advantages of clearer image, lower radiation, faster inspection speed and higher success rate.

However, please note: the X-ray dose and intensity of chest lateral position (similarly: lumbar lateral position) are much greater than that of chest upright position! So use it with caution!