We also found a statistically significant reduction in noise ( p = @ ) and increase in CNR ( p@ @ ) with increasing percentage of ASIR ; in addition , we noted statistically significant increases in image quality scores for the labrum and cartilage , subchondral bone , overall diagnostic quality ( up to @ % ASIR ) , and subjective noise ( p@ @ ) , and statistically significant reductions for the trabecular bone and muscles ( p@ @ ) .