2009年12月20日 · 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 ...

2022年5月10日 · We demonstrate the feasibility of this technique for depiction of intracranial vasculature at 7 T and highlight the exquisite detail gained with ultra-high-field-strength MRI. These advantages may play a key role in the added detection and characterization of abnormalities of the cerebral venous system. Disclosures of conflicts of interest: D.A.L.

2024年4月1日 · In this article, we will review the current techniques used in clinical cerebrovascular imaging, including TOF-MRA, MPRAGE-MRA, phase-contrast MRA (PC-MRA), vessel wall MRI (VW-MRI), MR venography (MRV), and discuss current problems and obstacles encountered at 7T MR systems.

2023年10月28日 · 7t双回波动静脉成像可提高mra和swi-mr静脉成像（mrv）对小血管的显示，其信噪比和磁敏感对比均优于3t。 颅内动脉粥样硬化斑块 与1.5T或3T TOF-MRA相比，7T MRA能更清晰地显示颅内血管，其测量狭窄的准确性也已在在体模型中得到了很好的验证。

2025年1月13日 · In this work, we propose an uncertainty-aware reconstruction model for accelerated 7T TOF-MRA, which combines the merits of deep unrolling and evidential deep learning, such that our model not only provides promising MRI reconstruction, but also supports uncertainty quantification within a single inference. Moreover, we propose a maximum ...

We have implemented and demonstrated markedly improved imaging of both time-of-flight (TOF) MR angiogram (MRA) and blood oxygenation level-dependent (BOLD) MR venogram (MRV) at 7T that were acquired simultaneously using a newly developed compatible dual-echo arteriovenography (CODEA) technique, in comparison with the CODEA MRA/MRV at 3T.

2020年1月1日 · In the present review, we examine emerging neurosurgical applications of 7T MR imaging in vascular imaging of diverse conditions and discuss current limitations and future directions for this technique. MR imaging at 7T is particularly …

7T MRA的超高分辨率和优异的图像质量使我们能够探索详细的形态学和血流动力学信息，发现早期细微的病理变化，为更深入地了解各种脑血管疾病的病理机制提供新的见解。 然而，在超高场强带来的好处的同时，也存在一些挑战和担忧。 尽管如此，持续的技术发展和临床导向研究将在不久的将来促进 7T MRA 的广泛临床应用。 在这篇综述文章中，我们总结了 7T MRA 在颅内血管疾病评估中的技术方面、临床应用和最新进展。 本综述的目的是为 7T MRA 评估颅内血管疾病的 …

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 signal-to-noise ratio (SNR) and susceptibility contrast, compared to 3T.

7T susceptibility-weighted imaging (SWI) permits visualization and quantification of deep medullary veins. Dual-echo arteriovenography at 7T can improve visualization of small vessels on MRA and SWI-MRV due to the increased SNR and susceptibility contrast compared to 3T.