期刊
MAGNETIC RESONANCE IN MEDICINE
卷 82, 期 2, 页码 833-841出版社
WILEY
DOI: 10.1002/mrm.27743
关键词
32-channel; brain; carbon-13; echo-planar imaging; hyperpolarized; phased-array
资金
- NIH [R01 CA127612, P01 CA118816, P41 EB013598, P50 CA097257]
PurposeTo compare the performance of an 8-channel surface coil/clamshell transmitter and 32-channel head array coil/birdcage transmitter for hyperpolarized C-13 brain metabolic imaging. MethodsTo determine the field homogeneity of the radiofrequency transmitters, B-1+ mapping was performed on an ethylene glycol head phantom and evaluated by means of the double angle method. Using a 3D echo-planar imaging sequence, coil sensitivity and noise-only phantom data were acquired with the 8- and 32-channel receiver arrays, and compared against data from the birdcage in transceiver mode. Multislice frequency-specific C-13 dynamic echo-planar imaging was performed on a patient with a brain tumor for each hardware configuration following injection of hyperpolarized [1-C-13]pyruvate. Signal-to-noise ratio (SNR) was evaluated from pre-whitened phantom and temporally summed patient data after coil combination based on optimal weights. ResultsThe birdcage transmitter produced more uniform B-1+ compared with the clamshell: 0.07 versus 0.12 (fractional error). Phantom experiments conducted with matched lateral housing separation demonstrated 8- versus 32-channel mean transceiver-normalized SNR performance: 0.91 versus 0.97 at the head center; 6.67 versus 2.08 on the sides; 0.66 versus 2.73 at the anterior; and 0.67 versus 3.17 on the posterior aspect. While the 8-channel receiver array showed SNR benefits along lateral aspects, the 32-channel array exhibited greater coverage and a more uniform coil-combined profile. Temporally summed, parameter-normalized patient data showed SNRmean,slice ratios (8-channel/32-channel) ranging 0.5-2.00 from apical to central brain. White matter lactate-to-pyruvate ratios were conserved across hardware: 0.45 0.12 (8-channel) versus 0.43 +/- 0.14 (32-channel). ConclusionThe 8- and 32-channel hardware configurations each have advantages in particular brain anatomy.
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