Ultrashort echo time and zero echo time MR imaging and their applications at high magnetic fields: A literature survey

TL;DR

This literature survey reviews the development and application of Ultrashort Echo Time (UTE) and Zero Echo Time (ZTE) MRI sequences at high magnetic fields, highlighting their ability to image tissues with short T2 signals that conventional MRI cannot detect.

Contribution

It provides a comprehensive overview of UTE and ZTE techniques, their integration with high-field MRI, and their clinical applications across various body regions.

Findings

UTE and ZTE sequences enable imaging of short T2 tissues.

Coupling with high magnetic fields improves signal quality and sensitivity.

These techniques are crucial for musculoskeletal, neural, lung, and dental imaging.

Abstract

UTE (Ultrashort Echo Time) and ZTE (Zero Echo Time) sequences have been developed to detect short T2 relaxation signals coming from regions that are unable to be detected by conventional MRI methods. Due to the high dipole-dipole interactions in solid and semi-solid tissues, the echo time generated is simply not enough to produce a signal using conventional imaging method, often leading to void signal coming from the discussed areas. By the application of these techniques, solid and semi-solid areas can be imaged which can have a profound impact in clinical imaging. High and Ultra-high field strength (UHF) provides a vital advantage in providing better sensitivity and specificity of MR imaging. When coupled with the UTE and ZTE sequences, the image can recover void signals as well as a much-improved signal quality. To further this strategy, secondary data from various research tools was obtained to further validate the research while addressing the drawbacks to this approach. It was found that UTE and ZTE sequences coupled with some techniques such as qualitative imaging and new trajectories are very crucial for accurate image depiction of the areas of the musculoskeletal system, neural system, lung imaging and dental imaging.