摘要
Abstract
Objective To explore the feasibility of reducing the number of signal averages(NSA)to shorten MRI scanning time in patients with brain tumors.Methods Imaging data from 46 patients who were suspected of brain tumors and underwent contrast-enhanced brain MRI scans at Sun Yat-sen Memorial Hospital of Sun Yat-sen University were retrospectively analyzed between March 2015 and October 2024.The number of lesions detected,signal-to-noise ratio(SNR),contrast-to-noise ratio(CNR),overall image quality,and subjective scores of lesion boundaries were compared between the contrast-enhanced axial T1-weighted sequences with NSA=1 and those with NSA=2 for each patient.Results The SNRs,CNRs,and overall image quality scores of the contrast-enhanced sequence with NSA=2 were 310.78±248.05,112.80±151.63,and 4.74±0.58,respectively.In contrast,those of the contrast-enhanced sequence with NSA=1 were 237.40±159.74,89.29±110.18,and 4.5±0.59,respectively.The SNRs,CNRs,and overall image quality scores of the sequence were all significantly higher than the latter(P<0.001,P=0.002,and P=0.028,respectively).There were no statistically significant differences in the number of lesions detected or lesion boundary scores(both were 4.67±0.56)between the contrast-enhanced sequences with NSA=2 and those with NSA=1(P=0.564 and P=1.000,respectively).Conclusion Reducing NSA of the contrast-enhanced sequence from 2 to 1 significantly shortened scanning time while maintaining the samediagnostic performance.Thus,reducing NSA of the contrast-enhanced sequence from 2 to 1 to shorten the scanning time of brain tumor patients is feasible.关键词
脑肿瘤/对比增强磁共振检查/信号平均次数/扫描时间Key words
brain neoplasm/contrast-enhanced magnetic resonance imaging/number of signal averaged/scanning time分类
临床医学
