FIG. 4.

Comparison of phantom images with different FOVs. All images have 0.75 mm isotropic resolution, 400 × 120 pixels. a) & c) Conventional GA sampling, b) & d) proposed GA sampling for elliptical FOV. a)-b) both use 144 spokes; c)–d) both use 315 spokes. Note the significantly reduced streaking artifacts in b) & d). e) Larson’s method satisfying Nyquist rate (315 spokes). f) Proposed GA sampling satisfying Nyquist rate (377 spokes), the image quality is comparable to e). The unaliased FOV shapes are also shown (white dashed lines) for each sampling scheme. One region (white rectangle) is enlarged in the bottom row to better illustrate streaking artifacts due to undersampling.