Single-Shot ${\text{T}}_{{2}}$ Mapping Through OverLapping-Echo Detachment (OLED) Planar Imaging.

OBJECTIVE

Develop a reliable single-shot T mapping method with extra robustness to motion and the potential for real-time dynamic and quantitative MR imaging.

METHODS

A single-shot T mapping sequence was proposed based on spin-echo planar imaging acquisition scheme. Two overlapped echo signals with different T weighting were obtained simultaneously by using two small flip-angle excitation pulses and corresponding echo-shifting gradients. A detachment algorithm based on structure similarity constraint was proposed to separate the two echo signals. T mapping was obtained from the two separated echo signals.

RESULTS

The robustness and efficiency of the method were demonstrated through simulation, phantom experiments, and human brain measurements.

CONCLUSION

Reliable T mapping can be obtained within milliseconds even under continuous head motion.

SIGNIFICANCE

Reliable T mapping was achieved with a single shot for the first time. The proposed method will facilitate real-time dynamic and quantitative MR imaging.