Department of Radiological Sciences, School of Healthcare Sciences at Narita, International University of Health and Welfare.
Department of Radiology, School of Medicine, International University of Health and Welfare.
Magn Reson Med Sci. 2023 Apr 1;22(2):176-190. doi: 10.2463/mrms.rev.2022-0114. Epub 2023 Feb 7.
The liver moves with respiratory motion. Respiratory motion causes image artifacts as MRI is a motion-sensitive imaging modality; thus, MRI scan speed improvement has been an important technical development target for liver MRI for years. Recent pulse sequence and image reconstruction technology advancement has realized a fast liver MRI acquisition method. Such new technologies allow us to obtain liver MRI in a shorter time, particularly, within breath-holding time. Other benefits of new the technology and the higher spatial resolution liver MRI within a given scan time are improved slice coverage and smaller pixel size. In this review, MRI pulse sequence and reconstruction technologies to accelerate scan speed for T- and T-weighted liver MRI will be discussed. Technologies that reduce scan time while keeping image contrast, SNR and image spatial resolution are needed for fast MRI acquisition. We will discuss the progress of MRI acquisition methods, the enabling technology, established applications, current trends, and the future outlook.
肝脏随呼吸运动移动。由于 MRI 是一种对运动敏感的成像方式，呼吸运动会导致图像伪影；因此，多年来，提高 MRI 扫描速度一直是肝脏 MRI 的一个重要技术发展目标。近年来，脉冲序列和图像重建技术的进步实现了快速肝脏 MRI 采集方法。这些新技术使我们能够在更短的时间内获得肝脏 MRI，特别是在屏气时间内。新技术的其他好处以及在给定扫描时间内更高的空间分辨率肝脏 MRI 是改善的切片覆盖范围和更小的像素大小。在这篇综述中，将讨论用于加速 T1 和 T2 加权肝脏 MRI 扫描速度的 MRI 脉冲序列和重建技术。在快速 MRI 采集中，需要在保持图像对比度、信噪比和图像空间分辨率的同时减少扫描时间的技术。我们将讨论 MRI 采集方法的进展、使能技术、已建立的应用、当前趋势和未来展望。
