Fig 1.
Schematic diagrams for a short (14 cm; A) and a middle-length or long (17 or 21 cm; B) RF coil.
Fig 2.
(A) Coil array dimension, circuits, and elements. S: superior; R: right; P: posterior. (B) The top view of the coil array together with the mechanical housing.
Fig 3.
(A): coil geometries of both CS and SB arrays were arranged on the surface head helmet. The slice location of mid-sagittal, mid-coronal, and mid-transverse planes were shown. (B): The SNR profiles of the CS and SB arrays. The location of the ROI 1 and the ROI 2 were also shown in the sagittal slice image of the CS array. (C): The noise correlation matrix of both the CS array and the SB array. (D): SNR ratios comparison under 1D and 2D accelerated acquisitions using CS and SB arrays.
Table 1.
Ratios of average SNR (A) and average g-factor (B) at two regions-of-interest using CS or SB array and a Cartesian k-space trajectory with 1D and 2D accelerations.
Please note that ROI 1 represented a ring area with the width of 1.2 cm at the periphery of the phantom, and ROI 2 represented a circular area with the radius of the ROI equal to 2.4 cm at the center of the phantom.
Fig 4.
Structural images measured by the MPRAGE sequence at mid- sagittal, coronal, and transverse planes.
Fig 5.
Spatial distributions of the noise amplification in 1D and 2D accelerated parallel MRI using a Cartesian k-space trajectory with CS and SB arrays.
The noise amplification was quantified by the g-factor. The 1/ g-factor map was shown here.
Fig 6.
SENSE reconstructed images using 1D and 2D accelerated acquisitions with the CS and SB arrays.
Fig 7.
The spatial distribution of reconstruction error in 1, 2-, 3-, 4-, and 5-fold accelerated imaging using a radial k-space trajectory with CS and SB arrays.