Can MR Fluoroscopic Triggering Technique and Slow Rate Injection Provide Appropriate Arterial Phase Images With Reducing Artifacts on Gadoxetic Acid-DTPA (Gd-EOB-DTPA) -Enhanced Hepatic MR Imaging?
Can MR Fluoroscopic Triggering Technique and Slow Rate Injection Provide Appropriate Arterial Phase Images With Reducing Artifacts on Gadoxetic Acid-DTPA (Gd-EOB-DTPA) -Enhanced Hepatic MR Imaging?
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DOI：
10.1002/jmri.22241
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发表时间：
2010-08-01
影响因子：
4.4
通讯作者：
Colagrande, Stefano
中科院分区：
文献类型：
--
作者：
Haradome, Hiroki;Grazioli, Luigi;Colagrande, Stefano
目的：目的：探讨磁共振荧光透视触发技术和慢速注射是否能改善钆塞酸-DTPA增强（Gd-EOB-DTPA）磁共振成像中动脉期图像的质量，以减少伪影。所有MR图像均采用两种Gd-EOB-DTPA注射方案获得：（i）联合方案，其中使用MR透视触发技术和慢速注射（1 mL/s）;和（ii）作为比较，常规方案，其中采用调整的固定扫描延迟和普通速率注射（2 mL/s）。计算动脉期图像主动脉、门静脉和肝实质的信噪比（SNR）。结果：联合方案组主动脉和门静脉在动脉期图像上的SNR显著高于对照组，而联合方案组的SNR显著高于对照组主动脉/门静脉（221.9 ± 91.9/197.1 ± 89.8）与常规方案组（169.8 ± 97.4/92.7 ± 48.5）比较，差异有统计学意义（P < 0.05）。联合方案的动脉期图像采集时间明显优于常规方案（P < 0.01）。联合方案的图像质量明显高于常规方案（P < 0.01）。结论：Gd-EOB-DTPA磁共振成像中，常规触发技术与慢速率注射技术相结合，可获得较好的动脉期图像，减少了Gd-EOB-DTPA磁共振成像中的伪影。
Purpose: To evaluate whether using MR fluoroscopic triggering technique and slow rate injection improves the quality of arterial phase images in gadoxetic acid-DTPA-enhanced (Gd-EOB-DTPA) MR imaging because of proper acquisition timing and reduction of artifacts.Materials and Methods: Two hundred sixteen patients undergoing examination for liver diseases were retrospectively reviewed. All MR images were obtained with two Gd-EOB-DTPA injection protocols: (i) a combination protocol, in which the MR fluoroscopic triggering technique and slow rate injection (1 mL/s) were used; and for comparison, (ii) a conventional protocol, in which adjusted fixed scan delay and ordinary rate injection (2 mL/s) were adopted. Signal-to-noise ratio (SNR) of aorta, portal vein, and liver parenchyma on arterial phase images were calculated. Two blinded readers independently evaluated the obtained arterial phase images in terms of acquisition timing and degree of artifacts.Results: The SNRs of aorta and portal vein on arterial phase images were significantly higher in the combination protocol group (aorta/portal: 221.9 +/- 91.9/197.1 +/- 89.8) than that in the conventional protocol group (aorta/portal: 169.8 +/- 97.4/92.7 +/- 48.5) (P < 0.05). The acquisition timing for arterial phase images with the combination protocol was significantly better than that with the conventional protocol (P < 0.01). The image quality of the combination protocol was significantly higher than that of the conventional protocol (P < 0.01). The occurrence rate of moderate or severe degree of artifacts in the conventional protocol (38.0%) was more prominent than that in the combination protocol (18.5%).Conclusion: The combination of the MR fluoroscopic triggering technique and slow rate injection provides proper arterial phase images and reduces the artifacts in Gd-EOB-DTPA MR imaging.