对比5.0T与3.0T平扫MRI显示胰岛素瘤质量

目的 对比5.0T与3.0T平扫MRI显示胰岛素瘤质量。方法 前瞻性对12例胰岛素瘤患者以5.0T和3.0T MR仪采集术前腹部T1WI、T2WI平扫并行弥散加权成像(DWI),对比5.0T与3.0T各序列MR图像质量主观评分及肿瘤-胰腺实质对比度评分,观察肿瘤信噪比(SNR)和对比度噪声比(CNR),比较各序列图像及总体肿瘤显示率。结果 5.0T T1WI和DWI显示胰岛素瘤的主观评分均高于3.0T T1WI和DWI(P均<0.05),5.0T T2WI主观评分与3.0T T2WI差异无统计学意义(P=0.166)。针对肿瘤-胰腺实质对比度评分,5.0T T1WI高于3.0T T1WI(P=0.023),而5.0T T2WI与3.0T T2WI、5.0T DWI与3.0T DWI差异均无统计学意义(P均>0.05)。胰岛素瘤SNR在5.0T T2WI高于3.0T T2WI(P=0.015),5.0T T1WI与3.0T T1WI、5.0T DWI与3.0T DWI之间差异均无统计学意义(P均>0.05);胰岛素瘤CNR在5.0T与3.0T各序列图像差异均无统计学意义(P均>0.05)。5.0T T1WI、T2WI及DWI胰岛素瘤显示率分别为100%(12/12)、66.67%(8/12)及83.33%(10/12),3.0T T1WI、T2WI及DWI分别为75.00%(9/12)、58.33%(7/12)及66.67%(8/12);5.0T MRI胰岛素瘤总体显示率为100%(12/12),3.0T MRI为83.33%(10/12)。结论 相比3.0T MRI,胰岛素瘤5.0T MRI显示胰岛素瘤更佳并有利于诊断。

Comparison on image quality of insulinoma 5.0T and 3.0T non-contrast MRI

Objective To compare image quality of 5.0T and 3.0T non-contrast MRI for displaying insulinoma. Methods Twelve patients with insulinoma were prospectively enrolled, and non-contrast abdominal T1WI, T2WI as well as diffusion-weighted imaging (DWI) were acquired using 5.0T and 3.0T MR scanners, respectively. The subjective scores of image quality of each sequence of 5.0T and 3.0T MRI, also of tumor-pancreas parenchyma contrast scores were compared. The signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of insulinomas were observed, and the displayed rate of insulinoma by each sequence and overall MRI were compared. Results The subjective scores of 5.0T T1WI and DWI were higher than those of 3.0T T1WI and DWI (both P<0.05), but not significantly different between 5.0T and 3.0T T2WI (P=0.166). Furthermore, the tumor-pancreas parenchyma contrast score of 5.0T T1WI was higher than that of 3.0T T1WI (P=0.023), but not significantly different between 5.0T and 3.0T T2WI, nor between 5.0T and 3.0T DWI (both P>0.05). SNR of insulinomas on 5.0T T2WI were higher than on 3.0T T2WI (P=0.015), however, no significant difference of SNR was found between 5.0T and 3.0T T1WI,nor between 5.0T and 3.0T DWI (both P>0.05). CNR of insulinomas on all 5.0T MRI were not significantly different with those on 3.0T MRI (all P>0.05). The displayed rate of insulinoma on 5.0T T1WI, T2WI and DWI was 100% (12/12), 66.67% (8/12) and 83.33% (10/12), respectively, on 3.0T T1WI, T2WI and DWI was 75.00% (9/12), 58.33% (7/12), 66.67% (8/12), respectively. The overall displayed rate of insulinoma on 5.0T and 3.0T MRI was 100% (12/12) and 83.33% (10/12), respectively. Conclusion Compared with 3.0T MRI, 5.0T MRI was superior for displaying insulinoma, hence being helpful for diagnosis.