Development of a symmetric echo planar imaging framework for clinical translation of rapid dynamic hyperpolarized 13C imaging. Issue 2 (21st February 2016)

• Record Type: Journal Article
• Authors: Gordon, Jeremy W.; Vigneron, Daniel B.; Larson, Peder E.Z.
• Is Part Of: Magnetic resonance in medicine. Volume 77:Issue 2(2017)
• Page Start: 826
• Page End: 832
• Publication Date: 2016-02-21
• Subjects: hyperpolarized 13C -- echoplanar imaging -- spectroscopic imaging -- reference scan; Nuclear magnetic resonance -- Periodicals; Electron paramagnetic resonance -- Periodicals; 616.07548
• DOI: 10.1002/mrm.26123
• Languages: English
• ISSNs: 0740-3194

Abstract

Abstract : Purpose: To develop symmetric echo planar imaging (EPI) and a reference scan framework for hyperpolarized 13 C metabolic imaging. Methods: Symmetric, ramp‐sampled EPI with partial Fourier reconstruction was implemented on a 3T scanner. The framework for acquiring a reference scan on the 1 H channel and applied to 13 C data was described and validated in both phantoms and in vivo metabolism of [1‐ 13 C]pyruvate. Results: Ramp‐sampled, symmetric EPI provided a substantial increase in the signal‐to‐noise ratio of the phantom experiments. The reference scan acquired on the 1 H channel yielded 13 C phantom images that varied in mean signal intensity <2%, compared with 13 C images reconstructed with a reference scan directly measured on the 13 C channel. The structural similarity index and dynamic time course from in vivo 13 C data further support the application of a 1 H reference scan to 13 C data to mitigate Nyquist ghost artifacts. Conclusion: Ramp‐sampled, symmetric EPI with spectral‐spatial excitation of a single metabolite provides a fast, robust, and clinically efficacious approach to acquire hyperpolarized 13 C dynamic molecular imaging data. The gains of this efficient sampling, combined with partial Fourier methods, enables large matrix sizes required for human studies. Magn Reson Med 77:826–832, 2017. © 2016 International Society for Magnetic Resonance in Medicine