Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 57, Issue 2, Pages 249-257Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/mrm.21119
Keywords
SENSE; PEPSI; parallel MRI; spectroscopic imaging; MRS
Funding
- NCRR NIH HHS [P41 RR14075] Funding Source: Medline
- NIBIB NIH HHS [R01 EB000790-04] Funding Source: Medline
- NICHD NIH HHS [R01 HD040712] Funding Source: Medline
- NIDA NIH HHS [R01 DA14178-01] Funding Source: Medline
- NINDS NIH HHS [R01 NS037462] Funding Source: Medline
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Magnetic resonance spectroscopic imaging (MRSI) provides spatially resolved metabolite information that is invaluable for both neuroscience studies and clinical applications. However, lengthy data acquisition times, which are a result of time-consuming phase encoding, represent a major challenge for MRSI. Fast MRSI pulse sequences that use echo-planar readout gradients, such as proton echo-planar spectroscopic imaging (PEPSI), are capable of fast spectra I-spatia I encoding and thus enable acceleration of image acquisition times. Combining PEPSI with recent advances in parallel MRI utilizing RF coil arrays can further accelerate MRSI data acquisition. Here we investigate the feasibility of ultrafast spectroscopic imaging at high field (3T and 4T) by combining PEPSI with sensitivity-encoded (SENSE) MRI using eight-channel head coil arrays. We show that the acquisition of single-average SENSE-PEPSI data at a short TE (15 ms) can be accelerated to 32 s or less, depending on the field strength, to obtain metabolic images of choline (Cho), creatine (Cre), N-acetyl-aspartate (NAA), and J-coupled metabolites (e.g., glutamate (Glu) and inositol (Ino)) with acceptable spectral quality and localization. The experimentally measured reductions in signal-to-noise ratio (SNR) and Cramer-Rao lower bounds (CRLBs) of metabolite resonances were well explained by both the g-factor and reduced measurement times. Thus, this technology is a promising means of reducing the scan times of 3D acquisitions and time-resolved 2D measurements.
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