On @-Tesla MRA , remnants were larger than on @-Tesla MRA ( difference : @ mm ; @ % CI : @-@ @ ) and larger than on IA-DSA ( difference : @ mm ; @ % CI : @-@ @ ) with similar agreement on occlusion levels with IA-DSA for both field strengths ( @ ; @ % CI : @-@ @ for @-Tesla MRA and IA-DSA ; @ ; @ % CI : @-@ @ for @-Tesla MRA and IA-DSA ) .