Head images acquired with the shielded microstrip array at 7 T. When acceleration R is 1, the image was reconstructed by sum-of-squares method; the images with R = 2–6 were reconstructed offline by using GRAPPA. When R is 1–5, ACS lines for R = 1–5 is 10, for R = 6–12 is 20, for R = 13–16 is 40. Images were acquired with a GRE pulse sequence (Flip angle 20°, Matrix size 256 × 256, Slice Thickness 3 mm, TR/TE 100 ms/6.9 ms, and FOV 24 cm × 24 cm).