The difference between DR and CT is mainly the following: 1. 2, the two indications are different, DR examination is usually used for lung and skeletal system diseases, while CT its indications are more extensive, from the head, chest, abdomen to the skeletal system, almost all can be examined; 3, their radiation to the body is different, DR radiation to the body will be less, while CT is usually several times the DR or even dozens of times; 4, the price of the two is different, the price of DR in the tens of dollars, while the price of CT between 100-200 yuan.