”Every year the unit has a medical checkup, and last year nothing happened!” Ms. Wang just had a chest X-ray for coughing, and the report said “left lung shadow”. The next series of laboratory tests suggested by the thoracic surgeon made Ms. Wang vaguely feel that she had lung cancer, but she really couldn’t accept this fact. In fact, cases like Ms. Wang’s are often encountered in clinical work. With the improvement of living standards, people’s awareness of their own health care has increased significantly, and most units arrange annual medical checkups for their employees, which has played a very positive role in the health of the whole population. However, due to the nature of the census, the economic situation of each unit is different, the means of inspection is relatively simple. For chest examinations, fluoroscopy is often chosen, unaware of the great disadvantages of fluoroscopy in the census. The biggest problem is that due to the limitation of radiation dose, it is impossible for the examining physician to carefully observe the irradiated field. In contrast, the harsh fact before us is that the data from home and abroad show that lung cancer has become the tumor with the highest morbidity and mortality rate, so the “three early” principles of “early detection, early diagnosis, and early treatment” are advocated, and the disadvantages of fluoroscopy have become “early detection” and “early treatment”. The disadvantage of fluoroscopy has become the biggest obstacle to “early detection”. The aforementioned Ms. Wang had a chest X-ray last year, so how can we prove that she must not have had a problem last year? Now digital imaging technology has become very popular, digital photography has a low dose of radiation, clear image characteristics, and the price has been generally accepted, the information is easy to save, so in the face of their own health-related medical examination, you will still choose chest X-ray?