Figure 1.

Pulse sequence diagram for MT-MACS technique and corresponding k-space sampling pattern. (A) Nonselective T2-preparation inversion recovery (T2-IR) pulses were applied every TR followed by continuous FLASH readout alpha pulses. One k-space line was collected every alpha pulse. After each blue arrow, an auxiliary line was acquired every 9 lines as the low-rank tensor subspace training data. Data acquisition module contained 300 readout segments followed by a short gap of fixed duration until the next T2-IR preparation pulse. (B) Simplified illustration of k-space sampling strategy. The auxiliary data was collected at the k-space center. Cartesian sampling with randomized reordering with a variable-density Gaussian distribution in ky and kz directions was adopted in this sequence.