Dual-echo arteriovenography imaging with 7T MRI.

Dual-echo arteriovenography imaging with 7T MRI.
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DOI:
10.1002/jmri.22019
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发表时间:
2010-01
影响因子:
4.4
通讯作者:
Zhao, Tiejun
Zhao, Tiejun
中科院分区:
医学2区
文献类型:
--
作者:
Bae, Kyongtae Ty;Park, Sung-Hong;Moon, Chan-Hong;Kim, Jung-Hwan;Kaya, Diana;Zhao, Tiejun

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实施 7T 双回波序列 MR 成像技术,在单次 MR 采集中同时采集飞行时间 (TOF) MR 血管造影 (MRA) 和血氧水平依赖 (BOLD) MR 静脉造影 (MRV),并将图像质量与 3T 采集的图像质量进行比较。我们实现了具有特定回波 K 空间重新排序方案的双回波序列,以解耦 7T 下 MRA 和 MRV 的扫描参数要求。通过最大程度地分离为 MRA 和 MRV 采集的 K 空间中心区域以及通过调整和应用 MRA 和 MRV 之间兼容的扫描参数来增强 MRA 和 MRV 血管对比度。在 3T 下实施相同的成像序列。四名正常受试者在 3T 和 7T 下进行成像。在使用和不使用相位掩模滤波的情况下均重建了 7T 的 MRA 和 MRV,并与使用相位掩模滤波的 3T 的 MRA 和 MRV 进行了定量和定性比较。 7T 时 MRA 和 MRV 上对小皮质动脉和静脉的描绘明显好于 3T 时的情况,因为动脉(164±57 比 77±26)和静脉(72±8 比 36±6)的对比度噪声比高出大约两倍。即使不使用相位掩蔽滤波,7T 时的静脉对比度 (65±7) 也高于 3T 时滤波的静脉对比度 (36±6)。我们在 7T 实施的双回波动静脉造影技术可以改善 MRA 和 MRV 中小血管的可视化,因为与 3T 相比,信噪比和磁敏感对比度大大提高。
To implement a dual-echo sequence MR imaging technique at 7T for simultaneous acquisition of time-of-flight (TOF) MR angiogram (MRA) and blood oxygenation level-dependent (BOLD) MR venogram (MRV) in a single MR acquisition and to compare the image qualities with those acquired at 3T. We implemented a dual-echo sequence with an echo-specific K-space reordering scheme to uncouple the scan parameter requirements for MRA and MRV at 7T. The MRA and MRV vascular contrast was enhanced by maximally separating the K-space center regions acquired for the MRA and MRV and by adjusting and applying scan parameters compatible between the MRA and MRV. The same imaging sequence was implemented at 3T. Four normal subjects were imaged at both 3T and 7T. MRA and MRV at 7T were reconstructed both with and without phase-mask filtering and were compared with those at 3T with phase-mask filtering quantitatively and qualitatively. The depiction of small cortical arteries and veins on MRA and MRV at 7T was substantially better than that at 3T, due to about twice higher contrast-to-noise ratio for both arteries (164±57 vs. 77±26) and veins (72±8 vs. 36±6). Even without use of the phase-masking filtering, the venous contrast at 7T (65±7) was higher than that with the filtering at 3T (36±6). The dual-echo arteriovenography technique we implemented at 7T allows the improved visualization of small vessels in both the MRA and MRV because of the greatly increased SNR and susceptibility contrast, compared to 3T.
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