Image quality scores were higher with dynamic-TI than without dynamic-TI ( 2.2 0.9 vs. 1.8 1.1 , P = 0.008 ) , as were blood-myocardium CGRs ( 13.8 7.6 vs. 8.3 6.1 , P = 0.003 ) and blood SGRs ( 19.6 8.5 vs. 13.1 8.0 , P = 0.003 ) .