Figure 2

Variable-density spirals can be optimized for incoherence of spatial aliasing artifacts, and iterative reconstruction from optimally undersampled data produces images with substantially reduced aliasing. This technique is applied to real-time cardiac MRI at 3-Tesla, and is compared with uniform-density spirals. Real-time RCA images obtained in a healthy volunteer at 3 Tesla. Uniform density spiral trajectories experience severe aliasing artifacts (a, d). Both optimally chosen VDS trajectories produce comparable image quality (b, c, e, f) with a clear depiction of the right coronary artery. Regularized iterative reconstruction (e, f) produces images with reduced aliasing artifacts and higher SNR compared to gridding reconstruction (b, c).