Objective To assess the value of intracranial time-of-flight magnetic resonance angiography(MRA)based on spiral imaging technology(MRAspiral)compared to compressed sensing(CS)reconstruction(MRACS).Methods From 29 May 2021 to 11 June 2022,brain MRA of 49 patients with suspected cerebrovascular disease was prospectively analyzed.MRA sequences with CS factor of 4(MRACS4)and MRAspiral(the acquisition window τ is 4,6,8,12)were acquired.The regions of interest were placed in the proximal and distal segments of the anterior cerebral artery,middle cerebral artery,and posterior cerebral artery(PCA)to calculate the contrast ratio(CR)with the corpus callosum as the background on both sequences.Qualitative analysis of image quality and diagnostic feasibility were performed independently by two experienced radiologists.One-way repeated measures ANOVA analysis was used to compare the differences in CR values and Friedman test was used to evaluate the differences in qualitative analysis.Results The CR value in the distal PCA(2.61±1.09)of MRAτ6 was significantly lower(P=0.014)than that of MRACS4(3.16±1.62).The CR values of the other MRAspiral images(MRAτ4:2.73±1.45,MRAτ8:2.78±1.28,MRAτ12:2.64±1.43)were not significantly different from those of MRACS4(P＞0.05).The CR values in the MRAτ4(4.78±0.41),MRAτ6(4.77±0.42)and MRAτ8(4.55±0.52)were significantly better than MRACS4 in distal vascular visualization(P＜0.005).MRACS4 showed better performance than MRAspiral in proximal vessels(P＞0.005).Conclusion MRAspiral is superior to MRACS in displaying distal intracranial vessels,allowing for a better assessment of the degree of intracranial vascular stenosis.MRAτ8 can reduce acquisition time while ensuring image quality.
关键词
磁共振血管成像/螺旋采集/压缩感知/脑动脉
Key words
Magnetic resonance angiography/Spiral acquisition/Compressed sensing/Cerebral artery
维普
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