Current Methods for Hyperpolarized [1-13C]pyruvate MRI Human Studies

TL;DR

This paper reviews current practices and challenges in conducting human hyperpolarized [1-13C]pyruvate MRI studies, covering preparation, system setup, data acquisition, and analysis to guide future research and standardization.

Contribution

It provides a comprehensive overview of successful methods and identifies gaps in current practices for hyperpolarized [1-13C]pyruvate MRI human studies.

Findings

Summarizes key components for successful studies.

Identifies evidence gaps and limitations.

Provides a reference for future consensus building.

Abstract

MRI with hyperpolarized (HP) 13C agents, also known as HP 13C MRI, can measure processes such as localized metabolism that is altered in numerous cancers, liver, heart, kidney diseases, and more. It has been translated into human studies during the past 10 years, with recent rapid growth in studies largely based on increasing availability of hyperpolarized agent preparation methods suitable for use in humans. This paper aims to capture the current successful practices for HP MRI human studies with [1-13C]pyruvate - by far the most commonly used agent, which sits at a key metabolic junction in glycolysis. The paper is divided into four major topic areas: (1) HP 13C-pyruvate preparation, (2) MRI system setup and calibrations, (3) data acquisition and image reconstruction, and (4) data analysis and quantification. In each area, we identified the key components for a successful study, summarized both published studies and current practices, and discuss evidence gaps, strengths, and limitations. This paper is the output of the HP 13C MRI Consensus Group as well as the ISMRM Hyperpolarized Media MR and Hyperpolarized Methods & Equipment study groups. It further aims to provide a comprehensive reference for future consensus building as the field continues to advance human studies with this metabolic imaging modality.