Clinical Value of Double Respiratory Navigator-gated High-resolution Black-blood Coronary Artery Wall Magnetic Resonance Imaging

Objective To explore the value of phase ordering with automatic window selection(PAWS)and simultaneous multiple volume(SMV)algorithm double respiratory navigator-gated two-dimensional(2DNAV)dual inversion recovery(DIR)fast spin echo(FSE)high-resolution black-blood coronary artery wall magnetic resonance imaging(MRI)and evaluate its advantages and limitations.Methods PAWS and SMV 2DNAV DIR FSE high-resolution black-blood MRI was performed in 21 healthy volunteers.The images were evaluated qualitatively by using four grades(grade 0:can not evaluate;grade 1:bad;grade 2:good;grade 3:perfect).Images defined as grade 0 and grade 1 were excluded and those defined as grade 2 and 3 were evaluated further.Thickness of proximal(or middle)segment of right coronary artery(RCA)and left anterior descending branch(LAD)were measured.The difference of wall thickness was analyzed by using two-tailed independent sample t-test.P values of less than 0.05 were considered statistically significant.Results Among the 38 slice images,31 slices(RCA:13 slices,LAD:18 slices;grade 2:14 slices,grade 3:17 slices)were obtained for further evaluation.The mean thickness of RCA and LAD was(0.94±0.16)and(0.89±0.15)mm,respectively,and the difference was not significant(t=-0.790,P0.05).Conclusion PAWS and SMV algorithm 2DNAV DIR FSE high-resolution black-blood MRI has certain clinical value for coronary artery wall imaging.