Pulse Sequences and Reconstruction in Fast MR Imaging of the Liver

Abstract

The liver moves with respiratory motion. Respiratory motion causes image artifacts as MRI is a motionsensitive 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 1 -and T 2 -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.

Feasibility of deep learning-reconstructed thin-slice single-breath-hold HASTE for detecting pancreatic lesions: A comparison with two conventional T2-weighted imaging sequences

“…However, conventional T2-weighted turbo spin echo (TSE) sequences are time-consuming (several minutes) and prone to motion artifacts due to multiple breath-hold and respiratory-triggered acquisitions [3] . These motion or respiratory artifacts can undermine radiologists’ confidence and accuracy in pancreatic diagnosis [4] . Furthermore, the pancreas, being thinner and surrounded by adjacent tissues, requires higher image quality compared to other abdominal organs[ 5 , 6 ].…”