Parallel Line-scan Echo-planar Spectroscopic Imaging

. Interestingly, the SNR of PLSEPSI around (α = 0 and β = 1) or (α = 1 and β = 0) is higher than the SNR of LSEPSI. This condition occurs if one line is primarily detected by one coil and the other is primarily detected by the other coil. We compared PLSEPSI to LSEPSI on a 7-T MRI for a small animal study using a phantom. A transmit and receive volume coil and a 2-ch receive array coil were used. The sensitivity map of each receive coil was calculated as the ratio between the gradient echo images acquired by the receive coil and the volume coil. The measurement parameters of PLSEPSI and LSEPSI were a TE of 136 ms, spectral bandwidth of 7.24 ppm (128 points), FOV of 32 mm (16 pixels), slice thickness of 2 mm, and the number of acquisitions was 1. The TR was 2000 ms for PLSEPSI and 4000 ms for LSEPSI. Cosine-modulated sinc waves, which were adjusted to excite parallel slices 2-mm wide and with a 16-mm interval each for π/2-pulse and π-pulse, were used for PLSEPSI. Averaging with sensitivity correction was used to process LSEPSI data, and unfolding the aliased image with sensitivity maps was used to process PLSEPSI data.