Simin Li1, Jian Wu1, Shuhui Cai1, and Congbo Cai1
1Department of Electronic Science, Xiamen University, Xiamen, China
1Department of Electronic Science, Xiamen University, Xiamen, China
We proposed an
overlapping-echo method for simultaneously multi-slice T2 mapping in
a single shot. Deep learning is used for image reconstruction. Our method
provides a way for ultrafast multi-slice quantitative MRI.
Figure
1 Single-shot double-slice SMS-OLED T2
mapping sequence. The RF pulses αa1
and αa2 are
used to excite slice a, and αb1 and αb2 are used to
excite slice b. The RF pulse β can be
a multi-band hybrid 180° refocusing pulse that causes magnetization vectors of
both slices a and b to be inverted simultaneously. Four echo-shifting
gradients G1, G2, G3, and G4 are
used to shift the four main echoes from the center of k-space, and Gcr
indicates crusher gradients along three directions.
Figure 2 The
magnitude images and T2 maps of rat head obtained with SMS-OLED
under different slice-to-slice gaps, in comparison with reference T2
maps. (a) 4 mm gap; (b) 6 mm gap; (c) 8 mm gap; (d) 10 mm gap.