常规三维容积内插屏气检查序列与自由呼吸StarVIBE序列T1WI肝脏图像质量对比

目的 对比分析常规三维容积内插屏气检查（VIBE）与StarVIBE序列的图像质量,探讨StarVIBE序列自由呼吸扫描在肝脏T1WI中的应用价值。方法 对48例超声提示肝脏病变患者行StarVIBE序列自由呼吸扫描及常规VIBE序列屏气扫描,根据患者能否配合屏气16 s分为无法屏气组（n=24）及配合屏气组（n=24）;采用"5分法"对肝脏边缘锐利度、肝脏血管清晰度、病变清晰度、伪影、脂肪抑制效果及图像总体质量进行主观评分,并计算平扫信号强度变异系数（CV）及增强后病灶肝脏信号比（LLR）;比较组内2序列间及2组间StarVIBE序列的图像质量差异。结果 无法屏气组StarVIBE序列图像的主观评分及定量评估参数值均高于常规VIBE序列（P均<0.05）;配合屏气组StarVIBE序列图像病灶清晰度（平扫）、伪影及脂肪抑制效果评分低于常规VIBE序列（P均<0.05）,而2序列间其余主观评分及定量评估差异均无统计学意义（P均>0.05）。2组间StarVIBE序列LLR差异有统计学意义（P<0.05）,各项主观评分及CV差异均无统计学意义（P均>0.05）。结论 在肝脏T1WI中,对于能配合屏气患者,StarVIBE序列图像质量略差于常规VIBE序列;而对于无法屏气患者,StarVIBE序列可获得更佳图像质量。

Comparative on image quality of liver between conventional 3D volumetric interpolated breath-hold examination sequence and free-breathing StarVIBE sequence T1WI

Objective To compare image quality of liver on conventional three dimensional-volumetric interpolated breath-hold examination (VIBE) and StarVIBE sequence TIWI, and to investigate the application value of StarVIBE sequence.Methods Totally 48 patients with ultrasound suggested liver lesions underwent StarVIBE sequence free-breathing and conventional VIBE sequence breath-hold scanning. According to whether the patient cooperated with breath-holding 16 s, the patients were divided into unable to hold breath group (n=24) and able to hold breath group (n=24). The liver edge sharpness, hepatic vessel clarity, lesion conspicuity, artifacts, fat saturation, and overall image quality were subjectively scored using "five-point method". The precontrast signal coefficient of variation (CV) and the postcontrast lesion-to-liver signal intensity ratios (LLR) were measured and calculated. The image quality of two sequences within the group and the image quality of StarVIBE sequence between two groups were compared.Results For non-breath-hold group, the subjective scoring and quantitative evaluation value of images quality of StarVIBE sequence were higher than those of conventional VIBE sequence (all P<0.05). For breath-hold group, scores of lesion conspicuity (pre-contrast), artifacts and fat saturation of StarVIBE sequence were lower than those of conventional VIBE sequence (all P<0.05), while the remaining subjective scoring and quantitative evaluation had no significant statistical differences between the two sequences (all P>0.05). LLR of StarVIBE sequence between two groups had significant statistical difference (P<0.05), while no significant statistical difference was found in CV and all subjective scoring (all P>0.05).Conclusion For liver T1WI, in breath-hold patients, image quality of StarVIBE sequence is slightly poorer than that of conventional VIBE sequence, while in non-breath-hold patients, StarVIBE sequence can obtain better image quality.