Fig. 1

Imaging workflow and T₁ Multitasking sequence diagram. a Imaging workflow: A self-gated (IntraGate) localizer was used to select a mid-cavity short-axis slice of the left ventricle (LV). The CMR Multitasking T₁ mapping sequence (T₁ Multitasking) was then performed. Gd contrast agent (Gadavist, 0.2 mmol/kg) was manually administered. 15 min after injection, T₁ Multitasking was repeated. The total exam time was around 25 min. b Sequence design: T₁ Multitasking was performed using a continuous FLASH acquisition with repeated non-selective inversion recovery (IR) magnetization preparation pulses. Odd-numbered readouts followed randomized Gaussian-density sampling in the phase encoding (\({k}_{y}\)) direction (used as the imaging data), and even-numbered readouts collected the k-space center line (\({k}_{y}=0\), used as the subspace training data)