Improving image quality by comparing two chest MRI sequences: free-breathing T1-weighted Star-VIBE and breath-holding T1-weighted 3D VIBE Dixon.

Zhanli Ren, Xirong Zhang, Haifeng Duan, Yu Nan
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Abstract

Objective: To explore the feasibility of using magnetic resonance imaging (MRI) with T1-weighted free-breathing Star-VIBE sequences for improving image quality in chest examinations compared with conventional T1-weighted breath-hold VIBE (C-VIBE) sequences.

Methods: The data of 20 patients with chest MRI examinations in our hospital were prospectively collected. The scanning sequences included conventional breath-hold T1-weighted VIBE sequences (echo time [TE]: 1.29 ms; repetition time [TR]: 3.97 ms) and free-breathing T1-weighted Star-VIBE sequences (TE: 1.39 ms; TR: 2.79 ms). The signal intensity (SI) and standard deviation (SD) of the ascending aorta, pulmonary artery trunk, and descending aorta were measured at the level of the main pulmonary artery. The signal-to-noise ratio (SNR = SI/SD) and coefficient of variation (CV = SD/SI) of SI were calculated. The MR image quality was subjectively scored double-blindly using a 5-point scoring system by two radiologists who had more than 10 years' experience in diagnosing chest diseases and more than 5 years' experience in MR diagnosis of chest diseases.

Results: The SNR of the ascending aorta, pulmonary artery trunk, and descending aorta with free-breathing T1-weighted Star-VIBE sequences was significantly higher than that of conventional breath-hold T1-weighted VIBE sequences (p < 0.05), while the CV of SI with the former sequences was significantly lower than that of the latter sequences (p < 0.05). The subjective scores of the two radiologists regarding the image quality of the two types of sequences had excellent consistency (κ > 0.80, p < 0.05); the subjective scores for free-breathing T1-weighted Star-VIBE sequences were significantly higher than for conventional breath-hold T1-weighted VIBE sequences (p < 0.05).

Conclusion: Magnetic resonance imaging with free-breathing T1-weighted Star-VIBE sequences can significantly improve image quality of chest studies compared with conventional breath-hold T1-weighted VIBE sequences.

通过比较两种胸部MRI序列:自由呼吸t1加权Star-VIBE和屏息t1加权3D VIBE Dixon,提高图像质量。
目的:探讨与常规t1加权憋气VIBE (C-VIBE)序列相比,利用t1加权自由呼吸Star-VIBE序列磁共振成像(MRI)提高胸部检查图像质量的可行性。方法:前瞻性收集我院20例胸部MRI检查患者的资料。扫描序列包括常规憋气t1加权VIBE序列(回波时间[TE]: 1.29 ms;重复时间[TR]: 3.97 ms)和自由呼吸t1加权Star-VIBE序列(TE: 1.39 ms;TR: 2.79 ms)。在肺动脉主干水平测量升主动脉、肺动脉干和降主动脉的信号强度(SI)和标准差(SD)。计算SI的信噪比(SNR = SI/SD)和变异系数(CV = SD/SI)。MR图像质量由两名具有10年以上胸部疾病诊断经验和5年以上胸部疾病MR诊断经验的放射科医师主观双盲评分,采用5分制评分。结果:自由呼吸t1加权Star-VIBE序列的升主动脉、肺动脉干和降主动脉的信噪比显著高于常规屏气t1加权VIBE序列(p 0.80,p )。结论:与常规屏气t1加权VIBE序列相比,自由呼吸t1加权Star-VIBE序列的磁共振成像可显著提高胸部研究的图像质量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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