Fig 3: Multi-resolution MRF results in the 2x2 pixel squares of the resolution phantom. The first column shows the ground truth T₁ and T₂ maps. The second column shows the result of acquiring low-resolution data and simply zero-padding the images; significant blurring is evident. The third column shows the result of acquiring 33% of the data with the high-resolution spiral trajectory. The fourth column shows the result of acquiring 50% of the data with the high-resolution spiral trajectory. The fourth column shows the result of acquiring all data with the high-resolution spiral.

Fig 1:(a) Flowchart for the proposed method. High-resolution data (red) and low-resolution data (black) are acquired and reconstructed to generate high-resolution timeseries images. A low rank reconstruction method is used to obtain property maps. (b) Spiral sampling scheme for 33% high-resolution data, where spiral 1 is the low-resolution spiral and spiral 2 is the high-resolution spiral. (c) Resolution phantom. Each cluster includes 4 squares with different T₁ and T₂ values, and range in size from 1x1 to 6x6 pixels. The white arrow denotes the 2x2 pixel cluster used in Figs 2-3.