Synopsis

Keywords: Contrast mechanisms: Spectroscopic Imaging (MRSI), Image acquisition: Image processing, Image acquisition: Sequences

MRSI can visualize the spatial distribution and concentration (or level) of some metabolites in vivo, with potential benefits for clinical diagnosis. MRSI initially utilized phase encoding along all directions and without acceleration techniques. These sequences are time-consuming and yield data with a relatively small number of voxels. They continue to be widely implemented in many facilities today without much improvement. However, extensive research has led to the development of techniques aimed at shortening acquisition time, improving sampling efficiency, and enhancing reconstruction methods. This presentation will introduce the imaging technique of phase-encoded MRSI, as well as several developed MRSI acquisition methods.

Overview

Magnetic Resonance Spectroscopic Imaging (MRSI) visualizes the spatial distribution and concentration (or level) of metabolites within the body, serving as a valuable tool for diagnosing various diseases. MRSI initially utilized Cartesian phase encoding without employing acceleration techniques. This approach limits the number of voxels acquired per scan, resulting in data of relatively low resolution. Despite these limitations, the method continues to be widely used in numerous medical facilities.
Advancements in scientific technology, particularly in MR equipment, have stimulated extensive research aimed at reducing acquisition times, enhancing sampling efficiency, and improving image reconstruction techniques. These efforts have fostered the development of new imaging sequences and techniques that enable faster and higher-resolution imaging.
This presentation will detail how Cartesian phase-encoded MRSI has been refined to reduce acquisition times while maintaining data quality. Additionally, it will explore innovative MRSI acquisition methods tailored for both clinical (≤3T) and higher static magnetic fields (≥7T). These methods aim to further decrease acquisition times and improve data quality, incorporating techniques such as parallel imaging and FID data acquisition. I will discuss the strengths and weaknesses of these methods, the critical information they provide, and the techniques used for quantifying MRSI data. The session is designed to highlight the potential benefits and challenges of MRSI in clinical applications and to showcase significant research findings achieved through the adoption of these advanced technologies. Ultimately, this presentation intends to enhance medical professionals' understanding of MRSI’s clinical utility and advocate for its broader use in diagnostic processes.

Acknowledgements

No acknowledgement found.

References

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