摘要
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16s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。
Objective To compare image quality of liver on conventional three dimensional-volumetric interpolated breathhold 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 16s,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.
引文
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