With this experiment we have conclusion as follows. $cdot$ Total FCR-9501 are 8 units. $cdot$ All hospitals under study are conducting the high kvp radiographing with 115-120kvp and 4$sim$10mAs. $cdot$ The mean value of the chest exposure was 0.524$sim$0.301mGy. $cdot$ The percentage of the absorber finding from phantom was more the 85% with a range of 100$sim$136 kvp. $cdot$ The mean dose from phantom was 0.990mGy with 124 kvp and 16 mAs. $cdot$ There is no difference in the amount of information due to the change of kvp and mAs, but some coarseness of images can be seen in the magnified images. $cdot$ The resolving power was about 1.5/mm. $cdot$ The increase and decrease of 10$sim$30 kvp from common kvp has not influenced on the amount of information. $cdot$ The exposure could be reduced by 0.170$sim$0.570mGy.