3.0T MR LAVA序列在上腹部检查的优势

目的 探讨3.0T MR LAVA序列多期动态增强扫描对上腹部病变检出率的优势.方法 对42例临床怀疑肝脏占位患者行MR检查,15例无肝脏病变患者作对照.常规MR T_1WI和T_2WI扫描,包括T1WI 2D和3D FSPGR序列,增强采用LAVA屏气动态多期扫描.分别对2D和3D及LAVA序列图像对病灶检出率进行比较分析,并测量肝、脾的信噪比等情况.结果 LAVA序列对42例肝脏病变患者做多期增强扫描后发现68个病灶,其显示率达100%,对病灶定性诊断准确率达95.6%(65/68).3D T_1WI FSPGR序列增强扫描对病灶显示率为91.2%(62/68),对病灶定性准确率为76.5%(52/68).2D T_1WI FSPGR序列病灶显示率为89.7%(61/68),对病灶定性准确率为70.6%(48/68).15例正常肝、脾组织,使用不同序列测量所得信噪比为:平扫LAVA肝29.68±2.31,脾36.21±3.67,2D肝46.21±5.32,脾58.75±4.68,3D肝19.79±2.23,脾23.36±2.14.增强LAVA肝41.75±5.13,脾57.96±6.13,2D肝56.33±5.63,脾63.21±5.32,3D肝29.05±4.68,脾46.37±5.17.结论 LAVA序列多期动态增强扫描对肝脏病灶的显示及肝血管显示方面较常规2D和3D序列优越.

The Advantages of MR LAVA Sequence in Abdominal Examination at 3.0T Magneton

Objective To evaluate the advantages of MR LAVA multi-phase dynamic contrast enhancement in abdominal MRI.Methods 42 cases which clinically suspected liver lesions and 15 normal volunteers underwent MRI examination,including routine T_1WI and T_2WI scan,T_1W 2D and 3D FSPGR,LAV A multi-phase contrast enhancement.The detecting rates of 2D,3D and LAVA images were analysed and the signal noise ratio(SNR)of the liver and spleen was observed.Results 68 lesions were detected by LAVA sequence,the detecting rate was 100%,the accurate rate of diagnosis was 95.6%(65/68),while the detecting rates of the lesions were 91.2%(62/68)and 89.7%(61/68)with 3D T1W FSPGR and 2D T1W FSPGR,respectively,the accurate rates in diagnosing the lesions were 76.5%(52/68)and 70.6%(48/68)with 3D and 2D sequences,respectively.The SNR of liver,spleen of 15 normal volunteers were:29.68±2.31 in liver,36.21 ±3.67 in spleen at LAVA plain scan,46.21 ±5.32 in liver,58.75±4.68 in spleen at 2D T_1W FSPGR,19.79±2.23 in liver,23.63±2.14 in spleen at 3D T_1W FSPGR,41.75±5.13 in liver,57.96±6.13 in spleen at LAVA contrast enhancement,56.33±5.63 in liver,63.21±5.32 in spleen at 2D contrast enhancement,29.05±4.68 in liver,46.37±5.17 in spleen at 3D contrast enhancement sequence.Conclusion LAVA multi-phase dynamic contrast enhancement is more predominant than T1W 2D and 3D and 3D FSPGR in displaying the lesions and blood vessels of liver.