Purpose: In vivo carbon-13 (13 C) MR spectroscopy (MRS) is capable of measuring energy metabolism and neuroenergetics, noninvasively in the brain. Indirect (1 H-[13 C]) MRS provides sensitivity benefits compared with direct 13 C methods, and normally includes a 1 H surface coil for both localization and signal reception. The aim was to develop a coil platform with homogenous B1+ and use short conventional pulses for short echo time proton observed carbon edited (POCE) MRS.
Methods: A 1 H-[13 C] MRS coil platform was designed with a volumetric resonator for 1 H transmit, and surface coils for 1 H reception and 13 C transmission. The Rx-only 1 H surface coil nullifies the requirement for a T/R switch before the 1 H preamplifier; the highpass filter and preamplifier can be placed proximal to the coil, thus minimizing sensitivity losses inherent with POCE-MRS systems described in the literature. The coil platform was evaluated with a PRESS-POCE sequence (TE = 12.6 ms) on a rat model.
Results: The coil provided excellent localization, uniform spin nutation, and sensitivity. 13 C labeling of Glu-H4 and Glx-H3 peaks, and the Glx-H2 peaks were observed approximately 13 and 21 min following the infusion of 1-13 C glucose, respectively.
Conclusion: A convenient and sensitive platform to study energy metabolism and neurotransmitter cycling is presented. Magn Reson Med 79:628-635, 2018. © 2017 International Society for Magnetic Resonance in Medicine.
Keywords: 1H-[13C] MRS; POCE; PRESS-POCE; [1-13C] glucose infusion; localized 13C edited MRS; short TE.
© 2017 International Society for Magnetic Resonance in Medicine.