Abstract
In the CT scanning of the extremities, defects of the pixels of long bone has been observed. This phenomenon was studied experimentally. In the repeated CT scanning of variously concentrated BaSO_4 solutions, EMI number unexpectedly changed from positive value into negative at certain concentration level. Similar phenomenon was observed in the CT scanning of phantom of extremity in which same solutions were used for bones. We concluded that it is the one of imaging characteristics of our scanner EMI 5005.
