MRI VIBE序列动态增强对肝脏局灶性病变的诊断价值

目的 探讨MRI快速梯度回波的三维容积式插入法屏气检查（three-dimensional volumetric interpolated breath—hold examination，3D-VIBE）序列动态增强扫描对肝脏局灶性病变的诊断价值。方法 对51例CT及US检查未明确诊断的肝脏局灶性病变病例相继进行常规自旋回波（spin—echo，SE）T2W、2DGRET1W平扫和3D-VIBE序列的钆剂增强多期（动脉早期、动脉晚期和门静脉期）扫描，分别观察各种病灶在平扫和多期增强扫描各时相的信噪比（SNR）、对噪比（CNR）、信号强度和强化规律，并与临床、手术病理结果等对照。结果 各种类型的肝脏局灶性病变的SNR和CNR，信号强度及强化特点存在不同程度的差异。结论 MRI3D-VIBE序列动态增强对肝脏各种局灶性病变具有重要的定性诊断及鉴别诊断价值。

Diagnostic Value of Contrast-Enhanced Volumetric Interpolated Breath-Hold Examination MR Sequence in Focal Hepatic Lesions

Objective To investigate the diagnostic value of a fast gradient-echo(GRE) three-dimensional contrast-enhanced volumetric interpolated breath-hold examination(3D-VIBE) MR sequence in evaluating focal liver lesions.Methods Conventional spin-echo T2W,2D GRE T1W plain scan and Gd-enhanced 3D-VIBE multi-phasic(early arterial,late arterial and portal venous phases) acquisitions were prospectively performed for 51 consecutive patients suspected of having focal liver lesions on CT or ultrasound imaging.Native T2W and 2D GRE T1W were acquired first,then 3D-VIBE fast scanning at early arterial,late arterial and portal venous phases respectively.The SNR and CNR of the liver lesions on plain scan and the enhancement patterns on contrast-enhanced 3D-VIBE images were carefully observed with correlation of the clinical and surgical pathological findings.Results There exited certain differences in SNR,CNR,and the enhancement patterns of different kinds of focal hepatic lesions in plain scan and Gd-enhanced multi-phasic 3D-VIBE acquisitions.Conclusion 3D-VIBE MR sequence is helpful in the detection and characterization of focal liver lesions.